National Library of Energy BETA

Sample records for near-field enhanced geothermal

  1. Enhanced Geothermal Systems Demonstration Projects

    SciTech Connect (OSTI)

    Geothermal Technologies Office

    2013-08-06

    Several Enhanced Geothermal Systems (EGS) demonstration projects are highlighted on this Geothermal Technologies Office Web page.

  2. Enhanced Geothermal Systems Technologies

    Broader source: Energy.gov [DOE]

    Geothermal Energy an​d the Enhanced Geothermal Systems Concept The Navy 1 geothermal power plant near Coso Hot Springs, California, is applying EGS technology. Heat is naturally present everywhere in the earth. For all intents and purposes, heat from the earth is inexhaustible. Water is not nearly as ubiquitous in the earth as heat. Most aqueous fluids are derived from surface waters that have percolated into the earth along permeable pathways such as faults. Permeability is a measure of the ease of fluid flow through rock. The permeability of rock results from pores, fractures, joints, faults, and other openings which allow fluids to move. High permeability implies that fluids can flow rapidly through the rock. Permeability and, subsequently, the amount of fluids tend to decrease with depth as openings in the rocks compress from the weight of the overburden.

  3. Geothermal Technologies Program: Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Not Available

    2004-08-01

    This general publication describes enhanced geothermal systems (EGS) and the principles of operation. It also describes the DOE program R&D efforts in this area, and summarizes several projects using EGS technology.

  4. Seismic Fracture Characterization Methods for Enhanced Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Seismic Fracture Characterization Methods for Enhanced Geothermal Systems; 2010 Geothermal Technology Program Peer Review Report Seismic Fracture Characterization Methods for ...

  5. Enhanced Geothermal Systems Roadmap Workshops | Department of...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Roadmap Workshops Enhanced Geothermal Systems Roadmap Workshops June 21, 2011 - 2:50pm Addthis Enhanced Geothermal Systems (EGS) are engineered or enhanced reservoirs created to...

  6. Nanomovement of azo polymers induced by metal tip enhanced near-field irradiation

    SciTech Connect (OSTI)

    Ishitobi, Hidekazu; Tanabe, Mamoru; Sekkat, Zouheir; Kawata, Satoshi

    2007-08-27

    Nanomovement of azo polymers induced by metal tip enhanced near-field illumination was studied. A protrusion with 47 nm full width at half maximum was induced with a resolution beyond the diffraction limit. At the top of the protrusion, an anisotropic movement occurs in a direction nearly parallel to the polarization of the incident light, and suggests the existence at the tip end of not only a longitudinal but also a lateral component of the electric field of light. The anisotropic photofluidity and the optical gradient force played important roles in the process of the light induced polymer movement.

  7. track 4: enhanced geothermal systems (EGS) | geothermal 2015 peer review |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy 4: enhanced geothermal systems (EGS) | geothermal 2015 peer review track 4: enhanced geothermal systems (EGS) | geothermal 2015 peer review The Energy Department pursues research in transformative science and engineering that the private sector is not financially or technically equipped to undertake. At the 2015 Peer Review, awardees in the Geothermal Technologies Office portfolio presented fifty three technical project presentations on enhanced geothermal systems

  8. Salton Sea Geothermal Field, California, as a near-field natural analog of a radioactive waste repository in salt

    SciTech Connect (OSTI)

    Elders, W.A.; Cohen, L.H.

    1983-11-01

    Since high concentrations of radionuclides and high temperatures are not normally encountered in salt domes or beds, finding an exact geologic analog of expected near-field conditions in a mined nuclear waste repository in salt will be difficult. The Salton Sea Geothermal Field, however, provides an opportunity to investigate the migration and retardation of naturally occurring U, Th, Ra, Cs, Sr and other elements in hot brines which have been moving through clay-rich sedimentary rocks for up to 100,000 years. The more than thirty deep wells drilled in this field to produce steam for electrical generation penetrate sedimentary rocks containing concentrated brines where temperatures reach 365/sup 0/C at only 2 km depth. The brines are primarily Na, K, Ca chlorides with up to 25% of total dissolved solids; they also contain high concentrations of metals such as Fe, Mn, Li, Zn, and Pb. This report describes the geology, geophysics and geochemistry of this system as a prelude to a study of the mobility of naturally occurring radionuclides and radionuclide analogs within it. The aim of this study is to provide data to assist in validating quantitative models of repository behavior and to use in designing and evaluating waste packages and engineered barriers. 128 references, 33 figures, 13 tables.

  9. Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Jeanloz, R.; Stone, H.

    2013-12-31

    DOE, through the Geothermal Technologies Office (GTO) within the Office of Energy Efficiency and Renewable Energy, requested this study, identifying a focus on: i) assessment of technologies and approaches for subsurface imaging and characterization so as to be able to validate EGS opportunities, and ii) assessment of approaches toward creating sites for EGS, including science and engineering to enhance permeability and increase the recovery factor. Two days of briefings provided in-depth discussion of a wide range of themes and challenges in EGS, and represented perspectives from industry, government laboratories and university researchers. JASON also contacted colleagues from universities, government labs and industry in further conversations to learn the state of the field and potential technologies relevant to EGS.

  10. Enhanced Geothermal System Basics | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Geothermal » Enhanced Geothermal System Basics Enhanced Geothermal System Basics A naturally occurring geothermal system, known as Enhanced Geothermal Systems (EGS), is another form of renewable energy. It is defined by three key elements: heat, fluid, and permeability at depth. Essentially, these are engineered reservoirs that produce energy from geothermal resources in areas that are not usually considered economically viable due to a lack of water and/or the ability of that water to pass

  11. Geothermal Permeability Enhancement - Final Report

    SciTech Connect (OSTI)

    Joe Beall; Mark Walters

    2009-06-30

    The overall objective is to apply known permeability enhancement techniques to reduce the number of wells needed and demonstrate the applicability of the techniques to other undeveloped or under-developed fields. The Enhanced Geothermal System (EGS) concept presented in this project enhances energy extraction from reduced permeability zones in the super-heated, vapor-dominated Aidlin Field of the The Geysers geothermal reservoir. Numerous geothermal reservoirs worldwide, over a wide temperature range, contain zones of low permeability which limit the development potential and the efficient recovery of heat from these reservoirs. Low permeability results from poorly connected fractures or the lack of fractures. The Enhanced Geothermal System concept presented here expands these technologies by applying and evaluating them in a systematic, integrated program.

  12. Enhanced Geothermal System (EGS) Fact Sheet | Department of Energy

    Energy Savers [EERE]

    Enhanced Geothermal System (EGS) Fact Sheet Enhanced Geothermal System (EGS) Fact Sheet Overview of Enhanced Geothermal Systems. PDF icon egsbasics.pdf More Documents &...

  13. Enhanced Geothermal Systems (EGS)- the Future of Geothermal Energy

    Broader source: Energy.gov [DOE]

    While the amount of conventional hydrothermal power worldwide has reached nearly 12 gigawatts, exponentially more geothermal resources can be accessed through next-generation technologies known as enhanced geothermal systems (EGS).

  14. Enhanced Geothermal Systems | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Enhanced Geothermal Systems Enhanced Geothermal Systems Below are the project presentations and respective peer review results for Engineered Geothermal Systems, Low Temperature and Exploration Demonstration Projects. Newberry Volcano EGS Demonstration, Susan Petty, AltaRock Energy, Inc. Southwest Alaska Regional Geothermal Energy Project, Gary Friedmann, Naknek Electric Association New York Canyon Simulation, Bernard Raemy, Terra-Gen Power, LLC

  15. track 3: enhanced geothermal systems (EGS) | geothermal 2015 peer review |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy 3: enhanced geothermal systems (EGS) | geothermal 2015 peer review track 3: enhanced geothermal systems (EGS) | geothermal 2015 peer review EGS technologies utilize directional drilling and pressurized water to capture energy from resources that were once considered unrecoverable. Collaborative projects in this program seek to improve innovative technologies and speed commercial-scale deployment. The Energy Department pursues research in transformative science and

  16. Enhanced Geothermal Systems Webinar | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Enhanced Geothermal Systems Webinar Enhanced Geothermal Systems Webinar The following presentations are from a Webinar conducted on July 15, 2009, that was hosted by the Geothermal Resources Council (GRC) and sponsored by the American Public Power Association, National Rural Electric Cooperative Associate, Western Area Power Administration, and U.S. Department of Energy Geothermal Technologies Office. The Webinar covered topics including federal enhanced geothermal systems (EGS) activities and

  17. First Commercial Success for Enhanced Geothermal Systems (EGS...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Commercial Success for Enhanced Geothermal Systems (EGS) Spells Exponential Growth for Geothermal Energy First Commercial Success for Enhanced Geothermal Systems (EGS) Spells ...

  18. First Commercial Success for Enhanced Geothermal Systems (EGS...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    First Commercial Success for Enhanced Geothermal Systems (EGS) Spells Exponential Growth for Geothermal Energy First Commercial Success for Enhanced Geothermal Systems (EGS) Spells ...

  19. Tailored Working Fluids for Enhanced Binary Geothermal Power...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Tailored Working Fluids for Enhanced Binary Geothermal Power Plants Tailored Working Fluids for Enhanced Binary Geothermal Power Plants DOE Geothermal Program Peer Review 2010 - ...

  20. Monitoring and Modeling Fluid Flow in a Developing Enhanced Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Enhanced Geothermal System (EGS) Reservoir; 2010 Geothermal Technology Program Peer Review Report Monitoring and Modeling Fluid Flow in a Developing Enhanced Geothermal System ...

  1. Demonstration of an Enhanced Geothermal System at the Northwest...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Demonstration of an Enhanced Geothermal System at the Northwest Geysers Geothermal Field, California Geothermal Technologies Program 2010 Peer Review Demonstration of an Enhanced ...

  2. Energy Department Announces Project Selections for Enhanced Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Announces Project Selections for Enhanced Geothermal Systems (EGS) Subsurface Laboratory Energy Department Announces Project Selections for Enhanced Geothermal Systems (EGS) ...

  3. An Evaluation of Enhanced Geothermal Systems Technology

    SciTech Connect (OSTI)

    Jelacic, Allan; Fortuna, Raymond; LaSala, Raymond; Nathwani, Jay; Nix, Gerald; Visser, Charles; Green, Bruce; Renner, Joel; Blankenship, Douglas; Kennedy, Mack; Bruton, Carol

    2008-04-01

    This 2008 document presents the results of an eight-month study by the Department of Energy (DOE) and its support staff at the national laboratories concerning the technological requirements to commercialize a new geothermal technology, Enhanced Geothermal Systems (EGS).

  4. Enhanced Geothermal Systems (EGS) | Open Energy Information

    Open Energy Info (EERE)

    (Published: July 2009) "US DOE 2008 Renewable Energy Data Book" "The Future of Geothermal Energy" 3.0 3.1 3.2 "US DOE EERE Geothermal Technologies Program, Enhanced...

  5. Demonstration of an Enhanced Geothermal System at the Northwest...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    California; 2010 Geothermal Technology Program Peer Review Report Demonstration of an Enhanced Geothermal System at the Northwest Geysers Geothermal Field, California; 2010 ...

  6. Elucidating the sole contribution from electromagnetic near-fields in plasmon-enhanced Cu2O photocathodes

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    DuChene, Joseph S.; Williams, Benjamin P.; Johnston-Peck, Aaron C.; Qiu, Jingjing; Gomes, Mathieu; Amilhau, Maxime; Bejleri, Donald; Weng, Jiena; Su, Dong; Huo, Fengwei; et al

    2015-11-05

    Despite many promising reports of plasmon-enhanced photocatalysis, the inability to identify the individual contributions from multiple enhancement mechanisms has delayed the development of general design rules for engineering efficient plasmonic photocatalysts. Herein, we construct a plasmonic photocathode comprised of Au@SiO2 (core@shell) nanoparticles embedded within a Cu2O nanowire network to exclusively examine the contribution from one such mechanism: electromagnetic near-field enhancement. The influence of the local electromagnetic field intensity is correlated with the overall light-harvesting efficiency of the device through variation of the SiO2 shell thickness (5—22 nm) to systematically tailor the distance between the plasmonic Au nanoparticles and the Cu2Omore » nanowires. A three-fold increase in device photocurrent is achieved upon integrating the Au@SiO2 nanoparticles into the Cu2O nanowire network, further enabling a ~40% reduction in semiconductor film thickness while maintaining photocathode performance. Photoelectrochemical results are further correlated with photoluminescence studies and optical simulations to confirm that the near-field enhancement is the sole mechanism responsible for increased light absorption in the plasmonic photocathode.« less

  7. Seismic Fracture Characterization Methodologies for Enhanced Geothermal

    Office of Scientific and Technical Information (OSTI)

    Systems (Technical Report) | SciTech Connect Seismic Fracture Characterization Methodologies for Enhanced Geothermal Systems Citation Details In-Document Search Title: Seismic Fracture Characterization Methodologies for Enhanced Geothermal Systems Executive Summary The overall objective of this work was the development of surface and borehole seismic methodologies using both compressional and shear waves for characterizing faults and fractures in Enhanced Geothermal Systems. We used both

  8. Enhanced Geothermal Systems (EGS) | Open Energy Information

    Open Energy Info (EERE)

    DOE EGS Technical Roadmap DOE EGS Systems Demonstration Projects How EGS Works (Animation) EGS Development (Animation) EGS Schematic.jpg Dictionary.png Enhanced Geothermal...

  9. What is an Enhanced Geothermal System (EGS)? Fact Sheet

    SciTech Connect (OSTI)

    U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy

    2012-09-14

    This Geothermal Technologies Office fact sheet explains how engineered geothermal reservoirs called Enhanced Geothermal Systems are used to produce energy from geothermal resources that are otherwise not economical due to a lack of fluid and/or permeability.

  10. Fracture Characterization in Enhanced Geothermal Systems by Wellbore...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Characterization in Enhanced Geothermal Systems by Wellbore and Reservoir Analysis; 2010 Geothermal Technology Program Peer Review Report Fracture Characterization in Enhanced ...

  11. Enhanced Geothermal Systems (EGS) comparing water with CO2 as...

    Office of Scientific and Technical Information (OSTI)

    Enhanced Geothermal Systems (EGS) comparing water with CO2 as heattransmission fluids Citation Details In-Document Search Title: Enhanced Geothermal Systems (EGS) comparing water ...

  12. DOE and Partners Test Enhanced Geothermal Systems Technologies...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    and Partners Test Enhanced Geothermal Systems Technologies DOE and Partners Test Enhanced Geothermal Systems Technologies February 20, 2008 - 4:33pm Addthis DOE has embarked on a ...

  13. A Technology Roadmap for Strategic Development of Enhanced Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    A Technology Roadmap for Strategic Development of Enhanced Geothermal Systems A Technology Roadmap for Strategic Development of Enhanced Geothermal Systems DOE Project Partner ...

  14. Demonstration of an Enhanced Geothermal System at the Northwest...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Demonstration of an Enhanced Geothermal System at the Northwest Geysers Geothermal Field, ... of Research The Northwest Geysers EGS Demonstration Project has the goal of enhancing the ...

  15. How an Enhanced Geothermal System Works | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    an Enhanced Geothermal System Works How an Enhanced Geothermal System Works The Potential Enhanced Geothermal Systems (EGS), also sometimes called engineered geothermal systems, offer great potential for dramatically expanding the use of geothermal energy. Present geothermal power generation comes from hydrothermal reservoirs, and is somewhat limited in geographic application to specific ideal places in the western U.S. This represents the 'low-hanging fruit' of geothermal energy potential. EGS

  16. Monitoring and Modeling Fluid Flow in a Developing Enhanced Geothermal

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    System (EGS) Reservoir; 2010 Geothermal Technology Program Peer Review Report | Department of Energy Enhanced Geothermal System (EGS) Reservoir; 2010 Geothermal Technology Program Peer Review Report Monitoring and Modeling Fluid Flow in a Developing Enhanced Geothermal System (EGS) Reservoir; 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal Technologies Program Peer Review seismic_025_fehler.pdf (195.11 KB) More Documents & Publications Analysis of Geothermal

  17. Enhanced Geothermal Systems Subprogram Overview

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Baker Hughes Oilfield Operations Inc. Texas Engineering Experiment Station Impact ... NakNek Electric Association ARRA NakNek, Alaska Raft River, ID Source: US Geothermal ...

  18. Development of a plan to implement enhanced geothermal system...

    Open Energy Info (EERE)

    Enhanced Geothermal Systems was proposed. This embraces the idea that the amount of permeability and fluid in geothermal resources varies across a spectrum, with HDR at one end,...

  19. High-Temperature-High-Volume Lifting for Enhanced Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    More Documents & Publications High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems High-Temperature Motor Windings for Downhole Pumps Used in Geothermal Energy ...

  20. Demonstration of an Enhanced Geothermal System at the Northwest Geysers

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Geothermal Field, California; 2010 Geothermal Technology Program Peer Review Report | Department of Energy California; 2010 Geothermal Technology Program Peer Review Report Demonstration of an Enhanced Geothermal System at the Northwest Geysers Geothermal Field, California; 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal Technologies Program Peer Review egs_010_walters.pdf (182.53 KB) More Documents & Publications Concept Testing and Development at the Raft

  1. Development of Enhanced Geothermal Systems Technologies Workshops |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Development of Enhanced Geothermal Systems Technologies Workshops Development of Enhanced Geothermal Systems Technologies Workshops The following documents are from a series of four workshops held in 2007 that were intended to motivate facilitated discussion on technology gaps related to reservoir management and operations. The first presentation evaluated the assumptions set forth in the report by the Massachusetts Institute of Technology (MIT) titled The Future of

  2. Enhanced Geothermal Systems | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Enhanced Geothermal Systems Enhanced Geothermal Systems EGS-2-pager8-1 1.17.28 PM.jpg Steps to Develop Power Production at an EGS Site Step 1: Identify/Characterize a Site Develop a geologic model of a potential site via surface, geologic, geophysical, and remote sensing exploration. Assess the temperature gradient, permeability, in-situ stress directions of the resource, rock mechanical properties, and whether fluid is present. Determine if the necessary characteristics to create an EGS

  3. Tracer Methods for Characterizing Fracture Creation in Enhanced Geothermal

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Systems; 2010 Geothermal Technology Program Peer Review Report | Department of Energy Creation in Enhanced Geothermal Systems; 2010 Geothermal Technology Program Peer Review Report Tracer Methods for Characterizing Fracture Creation in Enhanced Geothermal Systems; 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal Technologies Program Peer Review reservoir_033_rose.pdf (207.82 KB) More Documents & Publications Tracer Methods for Characterizing Fracture Stimulation

  4. Creation of an Enhanced Geothermal System through Hydraulic and Thermal

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Stimulation; 2010 Geothermal Technology Program Peer Review Report | Department of Energy Enhanced Geothermal System through Hydraulic and Thermal Stimulation; 2010 Geothermal Technology Program Peer Review Report Creation of an Enhanced Geothermal System through Hydraulic and Thermal Stimulation; 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal Technologies Program Peer Review egs_009_rose.pdf (190.77 KB) More Documents & Publications Concept Testing and

  5. Enhanced Geothermal Systems Subprogram Overview | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Systems Subprogram Overview Enhanced Geothermal Systems Subprogram Overview This overview of GTP's Enhanced Geothermal Systems subprogram was given at the GTP Program Peer Review on May 18, 2010. overview_egs.pdf (681.23 KB) More Documents & Publications Stanford Geothermal Workshop - Geothermal Technologies Office Geothermal Technologies Program Annual Peer Review Presentation By Doug Hollett Geothermal Technologies Program Peer Review Program June 6 - 10, 2011

  6. Enhanced Geothermal System (EGS) Fact Sheet | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Enhanced Geothermal System (EGS) Fact Sheet Enhanced Geothermal Systems (EGS) are engineered reservoirs created to produce energy from geothermal resources that are otherwise not economical due to lack of water and/or permeability. EGS technology has the potential for accessing the earth's vast resources of heat located at depth to help meet the energy needs of the United States. Learn more about EGS from the Enhanced Geothermal Systems Fact Sheet below. Enhanced Geothermal Systems Fact Sheet

  7. Integrated Enhanced Geothermal Systems (EGS) research and development |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Integrated Enhanced Geothermal Systems (EGS) research and development Integrated Enhanced Geothermal Systems (EGS) research and development February 21, 2014 - 2:59pm Addthis Open Date: 02/21/2014 Close Date: 04/30/2014 Funding Organization: Department of Energy Geothermal Technologies Office Funding Number: DE-FOA-0000842 Summary: Through this Funding Opportunity Announcement (FOA), the Geothermal Technologies Office's (GTO) Enhanced Geothermal Systems (EGS) Subprogram

  8. Seismic Fracture Characterization Methods for Enhanced Geothermal Systems;

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    2010 Geothermal Technology Program Peer Review Report | Department of Energy Systems; 2010 Geothermal Technology Program Peer Review Report Seismic Fracture Characterization Methods for Enhanced Geothermal Systems; 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal Technologies Program Peer Review seismic_022_queen.pdf (195.2 KB) More Documents & Publications Microearthquake Technology for EGS Fracture Characterization; 2010 Geothermal Technology Program Peer

  9. Fracture Characterization in Enhanced Geothermal Systems by Wellbore and

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Reservoir Analysis; 2010 Geothermal Technology Program Peer Review Report | Department of Energy Analysis; 2010 Geothermal Technology Program Peer Review Report Fracture Characterization in Enhanced Geothermal Systems by Wellbore and Reservoir Analysis; 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal Technologies Program Peer Review reservoir_031_horne.pdf (209.56 KB) More Documents & Publications Three-dimensional Modeling of Fracture Clusters in Geothermal

  10. DOE and Partners Test Enhanced Geothermal Systems Technologies | Department

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    of Energy and Partners Test Enhanced Geothermal Systems Technologies DOE and Partners Test Enhanced Geothermal Systems Technologies February 20, 2008 - 4:33pm Addthis DOE has embarked on a project with a number of partners to test Enhanced Geothermal Systems (EGS) technologies at a commercial geothermal power facility near Reno, Nevada. EGS technology enhances the permeability of underground strata, typically by injecting water into the strata at high pressure. The concept was initially

  11. Tailored Working Fluids for Enhanced Binary Geothermal Power Plants |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Tailored Working Fluids for Enhanced Binary Geothermal Power Plants Tailored Working Fluids for Enhanced Binary Geothermal Power Plants DOE Geothermal Program Peer Review 2010 - Presentation. Project Objective: To improve the utilization of available energy in geothermal resources and increase the energy conversion efficiency of systems employed by a) tailoring the subcritical and/or supercritical glide of enhanced working fluids to best match thermal resources, and b)

  12. Induced seismicity associated with enhanced geothermal system

    SciTech Connect (OSTI)

    Majer, Ernest; Majer, Ernest L.; Baria, Roy; Stark, Mitch; Oates, Stephen; Bommer, Julian; Smith, Bill; Asanuma, Hiroshi

    2006-09-26

    Enhanced Geothermal Systems (EGS) offer the potential to significantly add to the world energy inventory. As with any development of new technology, some aspects of the technology has been accepted by the general public, but some have not yet been accepted and await further clarification before such acceptance is possible. One of the issues associated with EGS is the role of microseismicity during the creation of the underground reservoir and the subsequent extraction of the energy. The primary objectives of this white paper are to present an up-to-date review of the state of knowledge about induced seismicity during the creation and operation of enhanced geothermal systems, and to point out the gaps in knowledge that if addressed will allow an improved understanding of the mechanisms generating the events as well as serve as a basis to develop successful protocols for monitoring and addressing community issues associated with such induced seismicity. The information was collected though literature searches as well as convening three workshops to gather information from a wide audience. Although microseismicity has been associated with the development of production and injection operations in a variety of geothermal regions, there have been no or few adverse physical effects on the operations or on surrounding communities. Still, there is public concern over the possible amount and magnitude of the seismicity associated with current and future EGS operations. It is pointed out that microseismicity has been successfully dealt with in a variety of non-geothermal as well as geothermal environments. Several case histories are also presented to illustrate a variety of technical and public acceptance issues. It is concluded that EGS Induced seismicity need not pose any threat to the development of geothermal resources if community issues are properly handled. In fact, induced seismicity provides benefits because it can be used as a monitoring tool to understand the

  13. Enhanced Geothermal System (EGS) Fact Sheet | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Overview of Enhanced Geothermal Systems. egs_calpine_peer2013.pdf (3.1 MB) More Documents & Publications Demonstration of an Enhanced Geothermal System at the Northwest Geysers Geothermal Field, California EA-1733: Final Environmental Assessment Fracture Evolution Following a Hydraulic Stimulation within an EGS Reservoir

  14. Enhanced Geothermal System (EGS) Fact Sheet

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    1 Massachusetts Institute of Technology (MIT). 2006. The future of geothermal energy. Cambridge, Massachusetts. Available: http:geothermal.inel.govpublications...

  15. A Technology Roadmap for Strategic Development of Enhanced Geothermal

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Systems | Department of Energy A Technology Roadmap for Strategic Development of Enhanced Geothermal Systems A Technology Roadmap for Strategic Development of Enhanced Geothermal Systems DOE Project Partner AltaRock Energy drills for geothermal energy at the Newberry Volcano EGS Demonstration site, near Bend, Oregon. DOE Project Partner AltaRock Energy drills for geothermal energy at the Newberry Volcano EGS Demonstration site, near Bend, Oregon. This technical paper outlines opportunities

  16. Enhanced Geothermal System (EGS) Infographic | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Enhanced Geothermal System (EGS) Infographic Enhanced Geothermal System (EGS) Infographic Calpine Staff Run Tests at The Geysers Geothermal Power Plant in California Calpine Staff Run Tests at The Geysers Geothermal Power Plant in California The EGS infographic provides an overview of this burgeoning technology that could access an enormous, domestic, clean energy resource predicted at more than 100 GW in the United States alone, according to an MIT study. To take advantage of this vast

  17. Elucidating the sole contribution from electromagnetic near-fields in plasmon-enhanced Cu2O photocathodes

    SciTech Connect (OSTI)

    DuChene, Joseph S.; Williams, Benjamin P.; Johnston-Peck, Aaron C.; Qiu, Jingjing; Gomes, Mathieu; Amilhau, Maxime; Bejleri, Donald; Weng, Jiena; Su, Dong; Huo, Fengwei; Stach, Eric A.; Wei, Wei David

    2015-11-05

    Despite many promising reports of plasmon-enhanced photocatalysis, the inability to identify the individual contributions from multiple enhancement mechanisms has delayed the development of general design rules for engineering efficient plasmonic photocatalysts. Herein, we construct a plasmonic photocathode comprised of Au@SiO2 (core@shell) nanoparticles embedded within a Cu2O nanowire network to exclusively examine the contribution from one such mechanism: electromagnetic near-field enhancement. The influence of the local electromagnetic field intensity is correlated with the overall light-harvesting efficiency of the device through variation of the SiO2 shell thickness (5—22 nm) to systematically tailor the distance between the plasmonic Au nanoparticles and the Cu2O nanowires. A three-fold increase in device photocurrent is achieved upon integrating the Au@SiO2 nanoparticles into the Cu2O nanowire network, further enabling a ~40% reduction in semiconductor film thickness while maintaining photocathode performance. Photoelectrochemical results are further correlated with photoluminescence studies and optical simulations to confirm that the near-field enhancement is the sole mechanism responsible for increased light absorption in the plasmonic photocathode.

  18. Towards the Understanding of Induced Seismicity in Enhanced Geothermal

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Systems | Department of Energy Towards the Understanding of Induced Seismicity in Enhanced Geothermal Systems Towards the Understanding of Induced Seismicity in Enhanced Geothermal Systems Towards the Understanding of Induced Seismicity in Enhanced Geothermal Systems presentation at the April 2013 peer review meeting held in Denver, Colorado dreger_peer2013.pdf (2.75 MB) More Documents & Publications Detection and Characterization of Natural and Induced Fractures for the Development of

  19. Energy Department Announces Project Selections for Enhanced Geothermal

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Systems (EGS) Subsurface Laboratory | Department of Energy Announces Project Selections for Enhanced Geothermal Systems (EGS) Subsurface Laboratory Energy Department Announces Project Selections for Enhanced Geothermal Systems (EGS) Subsurface Laboratory April 28, 2015 - 9:43am Addthis Energy Department Announces Project Selections for Enhanced Geothermal Systems (EGS) Subsurface Laboratory WASHINGTON, DC - As part of the Obama Administration's all-of-the-above energy strategy, the Energy

  20. High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems presentation at the April 2013 peer review meeting held in Denver, Colorado.

  1. High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    Project objective: Advance the technology for well fluids lifting systems to meet the foreseeable pressure; temperature; and longevity needs of the Enhanced Geothermal Systems (EGS) industry.

  2. Seismic Methods For Resource Exploration In Enhanced Geothermal...

    Open Energy Info (EERE)

    Methods For Resource Exploration In Enhanced Geothermal Systems Jump to: navigation, search OpenEI Reference LibraryAdd to library Book: Seismic Methods For Resource Exploration In...

  3. Fracture Characterization in Enhanced Geothermal Systems by Wellbore...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Fracture Characterization in Enhanced Geothermal Systems by Wellbore and Reservoir Analysis Project Summary. To study the transport and recovery of injected SiO2 nanoparticles ...

  4. Water Use in Enhanced Geothermal Systems (EGS): Geology of U...

    Office of Scientific and Technical Information (OSTI)

    Water Use in Enhanced Geothermal Systems (EGS): Geology of U.S. Stimulation Projects, Water Costs, and Alternative Water Source Policies Citation Details In-Document Search Title: ...

  5. Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems by Ernie Majer, James Nelson, Ann Robertson-Tait, Jean Savy, and Ivan Wong January 2012 | DOE/EE-0662 Cover Image Courtesy of Katie L. Boyle, Lawrence Berkeley National Laboratory i i Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems Preface In June 2009, the New York Times published an article about the public fear of geothermal development causing earthquakes. The article

  6. BOREHOLE PRECONDITIONING OF GEOTHERMAL WELLS FOR ENHANCED GEOTHERMAL...

    Open Energy Info (EERE)

    is assumed positive and tension negative. Authors Diek, A.; White, L.; Roegiers, J.-C.; Moore, J.; McLennan and J. D. Published PROCEEDINGS, Thirty-Seventh Workshop on Geothermal...

  7. An evaluation of enhanced geothermal systems technology

    SciTech Connect (OSTI)

    None, None

    2009-01-18

    A review of the assumptions and conclusions of the DOE-sponsored 2006 MIT study on "The Future of Geothermal Energy" and an evaluation of relevant technology from the commercial geothermal industry.

  8. Tracers for Characterizing Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Karen Wright; George Redden; Carl D. Palmer; Harry Rollins; Mark Stone; Mason Harrup; Laurence C. Hull

    2010-02-01

    Information about the times of thermal breakthrough and subsequent rates of thermal drawdown in enhanced geothermal systems (EGS) is necessary for reservoir management, designing fracture stimulation and well drilling programs, and forecasting economic return. Thermal breakthrough in heterogeneous porous media can be estimated using conservative tracers and assumptions about heat transfer rates; however, tracers that undergo temperature-dependent changes can provide more detailed information about the thermal profile along the flow path through the reservoir. To be effectively applied, the thermal reaction rates of such temperature sensitive traces must be well characterized for the range of conditions that exist in geothermal systems. Reactive tracers proposed in the literature include benzoic and carboxylic acids (Adams) and organic esters and amides (Robinson et al.); however, the practical temperature range over which these tracers can be applied (100-275C) is somewhat limited. Further, for organic esters and amides, little is known about their sorption to the reservoir matrix and how such reactions impact data interpretation. Another approach involves tracers where the reference condition is internal to the tracer itself. Two examples are: 1) racemization of polymeric amino acids, and 2) mineral thermoluminescence. In these cases internal ratios of states are measured rather than extents of degradation and mass loss. Racemization of poly-L-lactic acid (for example) is temperature sensitive and therefore can be used as a temperature-recording tracer depending on the rates of racemization and stability of the amino acids. Heat-induced quenching of thermoluminescence of pre-irradiated LiF can also be used. To protect the tracers from alterations (extraneous reactions, dissolution) in geothermal environments we are encapsulating the tracers in core-shell colloidal structures that will subsequently be tested for their ability to be transported and to protect the

  9. Demonstration of an Enhanced Geothermal System at the Northwest Geysers Geothermal Field, California

    Broader source: Energy.gov [DOE]

    Geothermal Technologies Program 2010 Peer Review Demonstration of an Enhanced Geothermal System at the Northwest Geysers Geothermal Field California by Mark Walters of Calpine and Patrick Dobson of Lawrence Berkeley National Laboratory for Engineered Geothermal Systems Demonstration Projects Track. Objective to create an Enhanced Geothermal System (EGS) by directly and systematically injecting low volumes of coldŽ water into NW Geysers high temperature zone (HTZ), similar to inadvertentlyŽ created EGS in the oldest Geysers production area to the southeast of the EGS demonstration area. Other objectives are to investigate how cold-water injection mechanically and chemically affects fractured high temperature rock systems; demonstrate the technology to monitor and validate stimulation and sustainability of such an EGS; and develop an EGS research field laboratory that can be used for testing EGS stimulation and monitoring technologies including new high temperature tools developed by others.

  10. Enhanced Geothermal System (EGS) Fact Sheet

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    While advanced EGS technologies are young and still under development, EGS has been ... of Technology (MIT). 2006. The future of geothermal energy. Cambridge, Massachusetts. ...

  11. Enhanced Geothermal Systems | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    The AltaRock Energy EGS demonstration project at Newberry Volcano, Oregon, leverages DOE funds to demonstrate engineered geothermal systems in a green field setting. Source:...

  12. Enhanced Geothermal Systems: Comparing Water and CO2 as Heat...

    Office of Scientific and Technical Information (OSTI)

    ENHANCED GEOTHERMAL SYSTEMS (EGS): COMPARING WATER AND CO 2 AS HEAT TRANSMISSION FLUIDS ... with supercritical CO 2 instead of water as heat transmission fluid (D.W. Brown, 2000). ...

  13. Google.org Invests $10 Million in Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    Google.org, the philanthropic arm of the search engine company, announced on August 19 that it is investing $10.25 million in Enhanced Geothermal Systems (EGS) technology.

  14. Energy Department Announces $29 Million Investment in Enhanced Geothermal

    Energy Savers [EERE]

    Systems Efforts | Department of Energy 29 Million Investment in Enhanced Geothermal Systems Efforts Energy Department Announces $29 Million Investment in Enhanced Geothermal Systems Efforts August 31, 2016 - 10:36am Addthis News Media Contact DOENews@hq.doe.gov 202-586-4940 WASHINGTON, D.C. - As part of the Obama Administration's continued commitment to the President's Climate Action Plan, the Energy Department today announced $29 million in funding under the Frontier Observatory for

  15. A Technology Roadmap for Strategic Development of Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Ziagos, John; Phillips, Benjamin R.; Boyd, Lauren; Jelacic, Allan; Stillman, Greg; Hass, Eric

    2013-02-13

    Realization of EGS development would make geothermal a significant contender in the renewable energy portfolio, on the order of 100+ GWe in the United States alone. While up to 90% of the geothermal power resource in the United States is thought to reside in Enhanced Geothermal Systems (EGS), hurdles to commercial development still remain. The Geothermal Technologies Office, U.S. Department of Energy (DOE), began in 2011 to outline opportunities for advancing EGS technologies on five- to 20-year timescales, with community input on the underlying technology needs that will guide research and ultimately determine commercial success for EGS. This report traces DOE's research investments, past and present, and ties them to these technology needs, forming the basis for an EGS Technology Roadmap to help guide future DOE research. This roadmap is currently open for public comment. Send your comments to geothermal@ee.doe.gov.

  16. Towards the Understanding of Induced Seismicity in Enhanced Geothermal Systems

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Towards the Understanding of Induced Seismicity in Enhanced Geothermal Systems PI: Dr. Roland Gritto (Array IT) Presenter: Prof. Douglas Dreger (UC Berkeley) Project Officer: Lauren Boyd Total Project Funding: $1,455,251 April 23, 2013 This presentation does not contain any proprietary confidential, or otherwise restricted information. 2 | US DOE Geothermal Office eere.energy.gov * EGS operations rely on small-scale seismicity to delineate fracture extent, fracture type and pathways for water *

  17. Seismic Fracture Characterization Methods for Enhanced Geothermal Systems |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy Systems Seismic Fracture Characterization Methods for Enhanced Geothermal Systems Project objective: Make Seismic Work in Geothermal Areas; Characterize Fractures/Faults. seismic_queen_seismic_fracture.pdf (1.38 MB) More Documents & Publications Imaging, Characterizing, and Modeling of Fracture Networks and Fluid Flow in EGS Reservoirs; II: Full-Waveform Inversion of 3D-9C VSP data from Bradys EGS Site and Update of the Brady Reservoir Scale Model Imaging,

  18. Enhanced Geothermal Systems (EGS) R&D Program: US Geothermal Resources Review and Needs Assessment

    SciTech Connect (OSTI)

    Entingh, Dan; McLarty, Lynn

    2000-11-30

    The purpose of this report is to lay the groundwork for an emerging process to assess U.S. geothermal resources that might be suitable for development as Enhanced Geothermal Systems (EGS). Interviews of leading geothermists indicate that doing that will be intertwined with updating assessments of U.S. higher-quality hydrothermal resources and reviewing methods for discovering ''hidden'' hydrothermal and EGS resources. The report reviews the history and status of assessment of high-temperature geothermal resources in the United States. Hydrothermal, Enhanced, and Hot Dry Rock resources are addressed. Geopressured geothermal resources are not. There are three main uses of geothermal resource assessments: (1) They inform industry and other interest parties of reasonable estimates of the amounts and likely locations of known and prospective geothermal resources. This provides a basis for private-sector decisions whether or not to enter the geothermal energy business at all, and for where to look for useful resources. (2) They inform government agencies (Federal, State, local) of the same kinds of information. This can inform strategic decisions, such as whether to continue to invest in creating and stimulating a geothermal industry--e.g., through research or financial incentives. And it informs certain agencies, e.g., Department of Interior, about what kinds of tactical operations might be required to support such activities as exploration and leasing. (3) They help the experts who are performing the assessment(s) to clarify their procedures and data, and in turn, provide the other two kinds of users with a more accurate interpretation of what the resulting estimates mean. The process of conducting this assessment brings a spotlight to bear on what has been accomplished in the domain of detecting and understanding reservoirs, in the period since the last major assessment was conducted.

  19. Temporary Cementitious Sealers in Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Sugama T.; Pyatina, T.; Butcher, T.; Brothers, L.; Bour, D.

    2011-12-31

    Unlike conventional hydrothennal geothermal technology that utilizes hot water as the energy conversion resources tapped from natural hydrothermal reservoir located at {approx}10 km below the ground surface, Enhanced Geothermal System (EGS) must create a hydrothermal reservoir in a hot rock stratum at temperatures {ge}200 C, present in {approx}5 km deep underground by employing hydraulic fracturing. This is the process of initiating and propagating a fracture as well as opening pre-existing fractures in a rock layer. In this operation, a considerable attention is paid to the pre-existing fractures and pressure-generated ones made in the underground foundation during drilling and logging. These fractures in terms of lost circulation zones often cause the wastage of a substantial amount of the circulated water-based drilling fluid or mud. Thus, such lost circulation zones must be plugged by sealing materials, so that the drilling operation can resume and continue. Next, one important consideration is the fact that the sealers must be disintegrated by highly pressured water to reopen the plugged fractures and to promote the propagation of reopened fractures. In response to this need, the objective of this phase I project in FYs 2009-2011 was to develop temporary cementitious fracture sealing materials possessing self-degradable properties generating when {ge} 200 C-heated scalers came in contact with water. At BNL, we formulated two types of non-Portland cementitious systems using inexpensive industrial by-products with pozzolanic properties, such as granulated blast-furnace slag from the steel industries, and fly ashes from coal-combustion power plants. These byproducts were activated by sodium silicate to initiate their pozzolanic reactions, and to create a cemetitious structure. One developed system was sodium silicate alkali-activated slag/Class C fly ash (AASC); the other was sodium silicate alkali-activated slag/Class F fly ash (AASF) as the binder of temper

  20. Geothermal

    Office of Scientific and Technical Information (OSTI)

    Geothermal Geothermal Legacy Collection Search the Geothermal Legacy Collection Search For Terms: Find + Advanced Search Advanced Search All Fields: Title: Full Text: ...

  1. Enhanced Geothermal in Nevada: Extracting Heat From the Earth to Generate

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Sustainable Power | Department of Energy Enhanced Geothermal in Nevada: Extracting Heat From the Earth to Generate Sustainable Power Enhanced Geothermal in Nevada: Extracting Heat From the Earth to Generate Sustainable Power April 12, 2013 - 11:17am Addthis Learn the basics of enhanced geothermal systems technology. I Infographic by <a href="http://energy.gov/contributors/sarah-gerrity">Sarah Gerrity</a>. Learn the basics of enhanced geothermal systems technology. I

  2. Tailored Working Fluids for Enhanced Binary Geothermal Power Plants

    SciTech Connect (OSTI)

    Mahmoud, Ahmad

    2013-01-29

    United Technologies Research Center (UTRC), in collaboration with the Georgia Institute of Technology and the National Institute of Standards and Technology will evaluate and develop fundamental and component level models, conduct experiments and generate data to support the use of mixed or enhanced working fluids for geothermal power generation applications.

  3. Towards the Understanding of Induced Seismicity in Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Gritto, Roland; Dreger, Douglas; Heidbach, Oliver

    2014-08-29

    This DOE funded project was a collaborative effort between Array Information Technology (AIT), the University of California at Berkeley (UCB), the Helmholtz Centre Potsdam - German Research Center for Geosciences (GFZ) and the Lawrence Berkeley National Laboratory (LBNL). It was also part of the European research project “GEISER”, an international collaboration with 11 European partners from six countries including universities, research centers and industry, with the goal to address and mitigate the problems associated with induced seismicity in Enhanced Geothermal Systems (EGS). The goal of the current project was to develop a combination of techniques, which evaluate the relationship between enhanced geothermal operations and the induced stress changes and associated earthquakes throughout the reservoir and the surrounding country rock. The project addressed the following questions: how enhanced geothermal activity changes the local and regional stress field; whether these activities can induce medium sized seismicity M > 3; (if so) how these events are correlated to geothermal activity in space and time; what is the largest possible event and strongest ground motion, and hence the potential hazard associated with these activities. The development of appropriate technology to thoroughly investigate and address these questions required a number of datasets to provide the different physical measurements distributed in space and time. Because such a dataset did not yet exist for an EGS system in the United State, we used current and past data from The Geysers geothermal field in northern California, which has been in operation since the 1960s. The research addressed the need to understand the causal mechanisms of induced seismicity, and demonstrated the advantage of imaging the physical properties and temporal changes of the reservoir. The work helped to model the relationship between injection and production and medium sized magnitude events that have

  4. First Commercial Success for Enhanced Geothermal Systems (EGS) Spells Exponential Growth for Geothermal Energy

    Broader source: Energy.gov [DOE]

    The Obama Administration's all-of-the-above energy strategy took a leap forward today with the Energy Department's announcement recognizing the nation's first commercial enhanced geothermal system (EGS) project to supply electricity to the grid. This landmark accomplishment follows two other major DOE-funded technical achievements focused on demonstrating the commercial viability of EGS: The Calpine EGS demonstration at The Geysers in Middletown, California and the AltaRock project at Newberry Volcano near Bend, Oregon.

  5. Magma energy and geothermal permeability enhancement programs

    SciTech Connect (OSTI)

    Dunn, J.C.

    1985-01-01

    Accomplishments during FY85 and project plans for FY86 are described for the Magma Energy Extraction and Permeability Enhancement programs. (ACR)

  6. Geothermal

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Stationary Power/Energy Conversion Efficiency/Geothermal Geothermal Tara Camacho-Lopez 2016-03-16T19:31:15+00:00 geothermal_leamstest Sandia's work in drilling technology is aimed at reducing the cost and risk associated with drilling in harsh, subterranean environments. The historical focus of the drilling research has been directed at significantly expanding the nation's utilization of geothermal energy. This focus in geothermal related drilling research is the search for practical solutions

  7. Development of Advanced Thermal-Hydrological-Mechanical-Chemical (THMC) Modeling Capabilities for Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    Development of Advanced Thermal-Hydrological-Mechanical-Chemical (THMC) Modeling Capabilities for Enhanced Geothermal Systems presentation at the April 2013 peer review meeting held in Denver, Colorado.

  8. Enhanced Geothermal Systems (EGS) with CO2as Heat Transmission Fluid

    Broader source: Energy.gov [DOE]

    The overall objective of the research is to explore the feasibility of operating enhanced geothermal systems (EGS) with CO2as heat transmission fluid.

  9. Energy Department Announces $10 Million to Speed Enhanced Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    to access engineered reservoirs will speed the deployment of this next generation geothermal technology and support geothermal energy's continued role in the U.S. clean energy mix. ...

  10. Completion Design Considerations for a Horizontal Enhanced Geothermal System

    SciTech Connect (OSTI)

    Olson, Jeffrey; Eustes, Alfred; Fleckenstein, William; Eker, Erdinc; Baker, Reed; Augustine, Chad

    2015-09-02

    The petroleum industry has had considerable success in recent decades in developing unconventional shale plays using horizontal drilling and multi-zonal isolation and stimulation techniques to fracture tight formations to enable the commercial production of oil and gas. Similar well completions could be used in Enhanced Geothermal Systems (EGS) to create multiple fractures from horizontal wells. This study assesses whether well completion techniques used in the unconventional shale industry to create multi-stage fractures can be applied to an enhanced geothermal system, with a focus on the completion of the EGS injection well. This study assumes an Enhanced Geothermal System (EGS) consisting of a central horizontal injection well flanked on each side by horizontal production wells, connected to the injection well by multiple fractures. The focus is on the design and completion of the horizontal well. For the purpose of developing design criteria, a reservoir temperature of 200 degrees C (392 degrees F) and an injection well flow rate of 87,000 barrels per day (160 kg/s), corresponding to production well flow rates of 43,500 barrels per day (80 kg/s) is assumed. The analysis found that 9-5/8 inches 53.5 pounds per foot (ppf) P110 casing string with premium connections meets all design criteria for the horizontal section of injection well. A P110 grade is fairly common and is often used in horizontal sections of shale development wells in petroleum operations. Next, several zonal isolation systems commonly used in the shale gas industry were evaluated. Three techniques were evaluated -- a 'plug and perf' design, a 'sand and perf' design, and a 'packer and port' design. A plug and perf system utilizes a cemented casing throughout the length of the injector wellbore. The sand and perf system is identical to the plug and perf system, but replaces packers with sand placed in the casing after stimulation to screen out the stimulated perforated zones and provide zonal

  11. Estimating Well Costs for Enhanced Geothermal System Applications

    SciTech Connect (OSTI)

    K. K. Bloomfield; P. T. Laney

    2005-08-01

    The objective of the work reported was to investigate the costs of drilling and completing wells and to relate those costs to the economic viability of enhanced geothermal systems (EGS). This is part of a larger parametric study of major cost components in an EGS. The possibility of improving the economics of EGS can be determined by analyzing the major cost components of the system, which include well drilling and completion. Determining what costs in developing an EGS are most sensitive will determine the areas of research to reduce those costs. The results of the well cost analysis will help determine the cost of a well for EGS development.

  12. Enhanced Geothermal Systems (EGS) well construction technology evaluation report.

    SciTech Connect (OSTI)

    Capuano, Louis, Jr.; Huh, Michael; Swanson, Robert; Raymond, David Wayne; Finger, John Travis; Mansure, Arthur James; Polsky, Yarom; Knudsen, Steven Dell

    2008-12-01

    Electricity production from geothermal resources is currently based on the exploitation of hydrothermal reservoirs. Hydrothermal reservoirs possess three ingredients critical to present day commercial extraction of subsurface heat: high temperature, in-situ fluid and high permeability. Relative to the total subsurface heat resource available, hydrothermal resources are geographically and quantitatively limited. A 2006 DOE sponsored study led by MIT entitled 'The Future of Geothermal Energy' estimates the thermal resource underlying the United States at depths between 3 km and 10 km to be on the order of 14 million EJ. For comparison purposes, total U.S. energy consumption in 2005 was 100 EJ. The overwhelming majority of this resource is present in geological formations which lack either in-situ fluid, permeability or both. Economical extraction of the heat in non-hydrothermal situations is termed Enhanced or Engineered Geothermal Systems (EGS). The technologies and processes required for EGS are currently in a developmental stage. Accessing the vast thermal resource between 3 km and 10 km in particular requires a significant extension of current hydrothermal practice, where wells rarely reach 3 km in depth. This report provides an assessment of well construction technology for EGS with two primary objectives: (1) Determining the ability of existing technologies to develop EGS wells. (2) Identifying critical well construction research lines and development technologies that are likely to enhance prospects for EGS viability and improve overall economics. Towards these ends, a methodology is followed in which a case study is developed to systematically and quantitatively evaluate EGS well construction technology needs. A baseline EGS well specification is first formulated. The steps, tasks and tools involved in the construction of this prospective baseline EGS well are then explicitly defined by a geothermal drilling contractor in terms of sequence, time and cost. A

  13. Enhanced Geothermal System (EGS) Fact Sheet | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    Calpine Staff Run Tests at The Geysers Geothermal Power Plant in California Calpine Staff Run Tests at The Geysers Geothermal Power Plant in California The EGS fact sheet provides...

  14. High-Temperature-High-Volume Lifting for Enhanced Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    ... Test Section Cross-section View Stator Motor Housing Rotor Bearings Seal Winding 9 | US DOE Geothermal Program eere.energy.gov Geothermal ESP - Thermal Test VFD Control Air Blower ...

  15. Enhanced Geothermal Systems (EGS) R&D Program

    SciTech Connect (OSTI)

    Entingh, Daniel J.

    1999-08-18

    The purpose of this workshop was to develop technical background facts necessary for planning continued research and development of Enhanced Geothermal Systems (EGS). EGS are geothermal reservoirs that require improvement of their permeability or fluid contents in order to achieve economic energy production. The initial focus of this R&D program is devising and testing means to extract additional economic energy from marginal volumes of hydrothermal reservoirs that are already producing commercial energy. By mid-1999, the evolution of the EGS R&D Program, begun in FY 1988 by the U.S. Department of Energy (DOE), reached the stage where considerable expertise had to be brought to bear on what technical goals should be pursued. The main purpose of this Workshop was to do that. The Workshop was sponsored by the Office of Geothermal Technologies of the Department of Energy. Its purpose and timing were endorsed by the EGS National Coordinating Committee, through which the EGS R&D Program receives guidance from members of the U.S. geothermal industry. Section 1.0 of this report documents the EGS R&D Program Review Session. There, managers and researchers described the goals and activities of the program. Recent experience with injection at The Geysers and analysis of downhole conditions at Dixie Valley highlighted this session. Section 2.0 contains a number of technical presentations that were invited or volunteered to illuminate important technical and economic facts and opportunities for research. The emphasis here was on fi.acture creation, detection, and analysis. Section 3.0 documents the initial general discussions of the participants. Important topics that emerged were: Specificity of defined projects, Optimizing cost effectiveness, Main technical areas to work on, Overlaps between EGS and Reservoir Technology R&D areas, Relationship of microseismic events to hydraulic fractures, and Defining criteria for prioritizing research thrusts. Sections 4.0 and 5.0 report

  16. Multiparameter fiber optic sensing system for monitoring enhanced geothermal systems

    SciTech Connect (OSTI)

    William A. Challener

    2014-12-04

    The goal of this project was to design, fabricate and test an optical fiber cable which supports multiple sensing modalities for measurements in the harsh environment of enhanced geothermal systems. To accomplish this task, optical fiber was tested at both high temperatures and strains for mechanical integrity, and in the presence of hydrogen for resistance to darkening. Both single mode (SM) and multimode (MM) commercially available optical fiber were identified and selected for the cable based on the results of these tests. The cable was designed and fabricated using a tube-within-tube construction containing two MM fibers and one SM fiber, and without supporting gel that is not suitable for high temperature environments. Commercial fiber optic sensing instruments using Raman DTS (distributed temperature sensing), Brillouin DTSS (distributed temperature and strain sensing), and Raleigh COTDR (coherent optical time domain reflectometry) were selected for field testing. A microelectromechanical systems (MEMS) pressure sensor was designed, fabricated, packaged, and calibrated for high pressure measurements at high temperatures and spliced to the cable. A fiber Bragg grating (FBG) temperature sensor was also spliced to the cable. A geothermal well was selected and its temperature and pressure were logged. The cable was then deployed in the well in two separate field tests and measurements were made on these different sensing modalities. Raman DTS measurements were found to be accurate to ±5°C, even with some residual hydrogen darkening. Brillouin DTSS measurements were in good agreement with the Raman results. The Rayleigh COTDR instrument was able to detect some acoustic signatures, but was generally disappointing. The FBG sensor was used to determine the effects of hydrogen darkening, but drift over time made it unreliable as a temperature or pressure sensor. The MEMS sensor was found to be highly stable and accurate to better than its

  17. Metal Organic Heat Carriers for Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    DOE Geothermal Program Peer Review 2010 - Presentation. This project addresses Energy Conversion Barrier N -Inability to lower the temperature conditions under which EGS power generation is commercially viable.

  18. Fluid Imaging of Enhanced Geothermal Systems through Joint 3D...

    Open Energy Info (EERE)

    reservoirs that have been created to extract economical amounts of heat from low permeability andor porosity geothermal resources. Critical to the success of EGS is the...

  19. Enhanced Geothermal Systems (EGS) with CO2 as Heat Transmission...

    Open Energy Info (EERE)

    Fluid Project Type Topic 1 Laboratory Call for Submission of Applications for Research, Development and Analysis of Geothermal Technologies Project Type Topic 2 Supercritical...

  20. Full Reviews: Enhanced Geothermal Systems | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Project Presentation | Peer Reviewer Comments Concept Testing and Development at the Raft River Geothermal Field, Idaho Joseph Moore, University of Utah Project Presentation | Peer ...

  1. Final Report: Enhanced Geothermal Systems Technology Phase II...

    Open Energy Info (EERE)

    Systems Technology Phase II: Animas Valley, New Mexico Authors R.A. Cunniff and R.L. Bowers Published Lightning Dock Geothermal, Inc. Technical Report, 2003 DOI Not...

  2. Geothermal

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Geothermal Louise Vickery, General Manager, Renewable Futures at the Australian Renewable Energy Agency (ARENA). Permalink Gallery Australian Renewable-Energy Official Visits Sandia Concentrating Solar Power, EC, Energy, Geothermal, News, News & Events, Photovoltaic, Renewable Energy, Solar, Water Power, Wind Energy Australian Renewable-Energy Official Visits Sandia Louise Vickery, General Manager, Renewable Futures at the Australian Renewable Energy Agency (ARENA). At the end of June,

  3. A man-made enhanced geothermal system (EGS) can extract the abundant...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    man-made enhanced geothermal system (EGS) can extract the abundant heat resource tens of thousands of feet below the surface and put it to good use. This would require: With an ...

  4. Nevada Deploys First U.S. Commercial, Grid-Connected Enhanced Geothermal System

    Broader source: Energy.gov [DOE]

    As part of the Obama Administration’s all-of-the-above energy strategy, the Energy Department recognized the nation’s first commercial enhanced geothermal system (EGS) project to supply electricity to the grid.

  5. Enhanced Geothermal Systems (EGS) R&D Program: Monitoring EGS-Related Research

    SciTech Connect (OSTI)

    McLarty, Lynn; Entingh, Daniel; Carwile, Clifton

    2000-09-29

    This report reviews technologies that could be applicable to Enhanced Geothermal Systems development. EGS covers the spectrum of geothermal resources from hydrothermal to hot dry rock. We monitored recent and ongoing research, as reported in the technical literature, that would be useful in expanding current and future geothermal fields. The literature review was supplemented by input obtained through contacts with researchers throughout the United States. Technologies are emerging that have exceptional promise for finding fractures in nonhomogeneous rock, especially during and after episodes of stimulation to enhance natural permeability.

  6. Water Use in Enhanced Geothermal Systems (EGS): Geology of U.S. Stimulation

    Office of Scientific and Technical Information (OSTI)

    Projects, Water Costs, and Alternative Water Source Policies (Technical Report) | SciTech Connect Water Use in Enhanced Geothermal Systems (EGS): Geology of U.S. Stimulation Projects, Water Costs, and Alternative Water Source Policies Citation Details In-Document Search Title: Water Use in Enhanced Geothermal Systems (EGS): Geology of U.S. Stimulation Projects, Water Costs, and Alternative Water Source Policies Authors: Harto, C. B. ; Schroeder, J. N. ; Horner, R. M. ; Patton, T. L. ;

  7. High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Turnquist, Norman; Qi, Xuele; Raminosoa, Tsarafidy; Salas, Ken; Samudrala, Omprakash; Shah, Manoj; Van Dam, Jeremy; Yin, Weijun; Zia, Jalal

    2013-12-20

    This report summarizes the progress made during the April 01, 2010 – December 30, 2013 period under Cooperative Agreement DE-EE0002752 for the U.S. Department of Energy entitled “High-Temperature-High-Volume Lifting for Enhanced Geothermal Systems.” The overall objective of this program is to advance the technology for well fluids lifting systems to meet the foreseeable pressure, temperature, and longevity needs of the Enhanced Geothermal Systems (EGS) industry for the coming ten years. In this program, lifting system requirements for EGS wells were established via consultation with industry experts and site visits. A number of artificial lift technologies were evaluated with regard to their applicability to EGS applications; it was determined that a system based on electric submersible pump (ESP) technology was best suited to EGS. Technical barriers were identified and a component-level technology development program was undertaken to address each barrier, with the most challenging being the development of a power-dense, small diameter motor that can operate reliably in a 300°C environment for up to three years. Some of the targeted individual component technologies include permanent magnet motor construction, high-temperature insulation, dielectrics, bearings, seals, thrust washers, and pump impellers/diffusers. Advances were also made in thermal management of electric motors. In addition to the overall system design for a full-scale EGS application, a subscale prototype was designed and fabricated. Like the full-scale design, the subscale prototype features a novel “flow-through-the-bore” permanent magnet electric motor that combines the use of high temperature materials with an internal cooling scheme that limits peak internal temperatures to <330°C. While the full-scale high-volume multi-stage pump is designed to lift up to 80 kg/s of process water, the subscale prototype is based on a production design that can pump 20 kg/s and has been modified

  8. Attosecond nanoscale near-field sampling

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Forg, B.; Schotz, J.; SuBmann, F.; Forster, M.; Kruger, M.; Ahn, B.; Okell, W. A.; Wintersperger, K.; Zherebtsov, S.; Guggenmos, A.; et al

    2016-05-31

    The promise of ultrafast light-field-driven electronic nanocircuits has stimulated the development of the new research field of attosecond nanophysics. An essential prerequisite for advancing this new area is the ability to characterize optical near fields from light interaction with nanostructures, with sub-cycle resolution. Here we experimentally demonstrate attosecond near-field retrieval for a tapered gold nanowire. Furthermore, by comparison of the results to those obtained from noble gas experiments and trajectory simulations, the spectral response of the nanotaper near field arising from laser excitation can be extracted.

  9. Enhanced Geothermal Systems Documents for Public Comment- Now Closed

    Broader source: Energy.gov [DOE]

    The DOE Geothermal Technologies Program invited the public's input on the technology improvement areas identified at the EGS Technology Roadmapping Information Exchange meeting held in San Francisco, California on August 3-4, 2011.

  10. Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    This Protocol is a living guidance document for geothermal developers, public officials, regulators and the general public that provides a set of general guidelines detailing useful steps to evaluate and manage the effects of induced seismicity related to EGS projects.

  11. Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Majer, Ernie; Nelson, James; Robertson-Tait, Ann; Savy, Jean; Wong, Ivan

    2012-01-01

    This Protocol is a living guidance document for geothermal developers, public officials, regulators and the general public that provides a set of general guidelines detailing useful steps to evaluate and manage the effects of induced seismicity related to EGS projects.

  12. ADVANCING REACTIVE TRACER METHODS FOR MONITORING THERMAL DRAWDOWN IN GEOTHERMAL ENHANCED GEOTHERMAL RESERVOIRS

    SciTech Connect (OSTI)

    Mitchell A. Plummer; Carl D. Palmer; Earl D. Mattson; George D. Redden; Laurence C. Hull

    2010-10-01

    Reactive tracers have long been considered a possible means of measuring thermal drawdown in a geothermal system, before significant cooling occurs at the extraction well. Here, we examine the sensitivity of the proposed method to evaluate reservoir cooling and demonstrate that while the sensitivity of the method as generally proposed is low, it may be practical under certain conditions.

  13. A man-made enhanced geothermal system (EGS) can extract the abundant heat resour

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    man-made enhanced geothermal system (EGS) can extract the abundant heat resource tens of thousands of feet below the surface and put it to good use. This would require: With an enhanced geothermal reservoir, you can generate power anywhere with hot rocks at depth! What makes EGS? + + Small pathways to conduct fluid through the hot rocks Fluid to carry heat from the rocks Abundant heat found in rocks at depth Abundant heat found in rocks at depth Limited pathways to conduct fluid Insufficient

  14. Energy Department Announces $10 Million to Speed Enhanced Geothermal Systems into the Market

    Broader source: Energy.gov [DOE]

    In support President Obama’s all-of-the-above energy strategy, the Energy Department today announced $10 million to improve subsurface characterization for enhanced geothermal systems (EGS) by developing state-of-the-art methods that quantify critical underground reservoir properties as they change over time.

  15. Modeling of heat extraction from variably fractured porous media in Enhanced Geothermal Systems

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Hadgu, Teklu; Kalinina, Elena Arkadievna; Lowry, Thomas Stephen

    2016-01-30

    Modeling of heat extraction in Enhanced Geothermal Systems is presented. The study builds on recent studies on the use of directional wells to improve heat transfer between doublet injection and production wells. The current study focuses on the influence of fracture orientation on production temperature in deep low permeability geothermal systems, and the effects of directional drilling and separation distance between boreholes on heat extraction. The modeling results indicate that fracture orientation with respect to the well-pair plane has significant influence on reservoir thermal drawdown. As a result, the vertical well doublet is impacted significantly more than the horizontal wellmore » doublet« less

  16. Development of Models to Simulate Tracer Behavior in Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Williams, Mark D.; Vermeul, Vincent R.; Reimus, P. W.; Newell, D.; Watson, Tom B.

    2010-06-01

    A recent report found that power and heat produced from engineered (or enhanced) geothermal systems (EGSs) could have a major impact on the United States while incurring minimal environmental impacts. EGS resources differ from high-grade hydrothermal resources in that they lack sufficient temperature distributions, permeability/porosity, fluid saturation, or recharge of reservoir fluids. Therefore, quantitative characterization of temperature distributions and the surface area available for heat transfer in EGS is necessary for commercial development of geothermal energy. The goal of this project is to provide integrated tracer and tracer interpretation tools to facilitate this characterization. Modeling capabilities are being developed as part of this project to support laboratory and field testing to characterize engineered geothermal systems in single- and multi-well tests using tracers. The objective of this report is to describe the simulation plan and the status of model development for simulating tracer tests for characterizing EGS.

  17. Geochemical Enhancement Of Enhanced Geothermal System Reservoirs: An Integrated Field And Geochemical Approach

    SciTech Connect (OSTI)

    Joseph N. Moore

    2007-12-31

    . In contrast, fluid inclusions trapped prior to injection are relatively gas rich. These results suggest that the rocks undergo extensive microfracturing during injection and that the composition of the fluid inclusions will be biased toward the youngest event. Interactions between the reservoir rocks and injectate were modeled using the non-isothermal reactive geochemical transport code TOUGHREACT. Changes in fluid pH, fracture porosity, fracture permeability, fluid temperature, and mineral abundances were monitored. The simulations predict that amorphous silica will precipitate primarily within a few meters of the injection well and that mineral deposition will lead to rapid declines in fracture porosity and permeability, consistent with field observations. In support of Enhanced Geothermal System development, petrologic studies of Coso well 46A-19RD were conducted to determine the regions that are most likely to fail when stimulated. These studies indicate that the most intensely brecciated and altered rocks in the zone targeted for stimulation (below 10,000 ft (3048 m)) occur between 11,200 and 11,350 ft (3414 and 3459 m). This zone is interpreted as a shear zone that initially juxtaposed quartz diorite against granodiorite. Strong pervasive alteration and veining within the brecciated quartz diorite and granodiorite suggest this shear zone was permeable in the past. This zone of weakness was subsequently exploited by a granophyre dike whose top occurs at 11,350 ft (3459 m). The dike is unaltered. We anticipate, based on analysis of the well samples that failure during stimulation will most likely occur on this shear zone.

  18. Scanning tip microwave near field microscope

    DOE Patents [OSTI]

    Xiang, Xiao-Dong; Schultz, Peter G.; Wei, Tao

    1998-01-01

    A microwave near field microscope has a novel microwave probe structure wherein the probing field of evanescent radiation is emitted from a sharpened metal tip instead of an aperture or gap. This sharpened tip, which is electrically and mechanically connected to a central electrode, extends through and beyond an aperture in an endwall of a microwave resonating device such as a microwave cavity resonator or a microwave stripline resonator. Since the field intensity at the tip increases as the tip sharpens, the total energy which is radiated from the tip and absorbed by the sample increases as the tip sharpens. The result is improved spatial resolution without sacrificing sensitivity.

  19. Scanning tip microwave near field microscope

    DOE Patents [OSTI]

    Xiang, X.D.; Schultz, P.G.; Wei, T.

    1998-10-13

    A microwave near field microscope has a novel microwave probe structure wherein the probing field of evanescent radiation is emitted from a sharpened metal tip instead of an aperture or gap. This sharpened tip, which is electrically and mechanically connected to a central electrode, extends through and beyond an aperture in an end wall of a microwave resonating device such as a microwave cavity resonator or a microwave stripline resonator. Since the field intensity at the tip increases as the tip sharpens, the total energy which is radiated from the tip and absorbed by the sample increases as the tip sharpens. The result is improved spatial resolution without sacrificing sensitivity. 17 figs.

  20. Geothermal Resources Council's ...

    Office of Scientific and Technical Information (OSTI)

    Enhanced Geothermal Systems (EGS) applications recommend lifting 300C geothermal water ... Therefore artificial lift techniques must be employed to return the high temperature water ...

  1. Geothermal Publications

    Broader source: Energy.gov [DOE]

    Here you'll find the Department of Energy's most recent publications about enhanced geothermal systems (EGS) technologies and research and development activities.

  2. Development of Models to Simulate Tracer Tests for Characterization of Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Williams, Mark D.; Reimus, Paul; Vermeul, Vincent R.; Rose, Peter; Dean, Cynthia A.; Watson, Tom B.; Newell, D.; Leecaster, Kevin; Brauser, Eric

    2013-05-01

    A recent report found that power and heat produced from enhanced (or engineered) geothermal systems (EGSs) could have a major impact on the U.S energy production capability while having a minimal impact on the environment. EGS resources differ from high-grade hydrothermal resources in that they lack sufficient temperature distribution, permeability/porosity, fluid saturation, or recharge of reservoir fluids. Therefore, quantitative characterization of temperature distributions and the surface area available for heat transfer in EGS is necessary for the design and commercial development of the geothermal energy of a potential EGS site. The goal of this project is to provide integrated tracer and tracer interpretation tools to facilitate this characterization. This project was initially focused on tracer development with the application of perfluorinated tracer (PFT) compounds, non-reactive tracers used in numerous applications from atmospheric transport to underground leak detection, to geothermal systems, and evaluation of encapsulated PFTs that would release tracers at targeted reservoir temperatures. After the 2011 midyear review and subsequent discussions with the U.S. Department of Energy Geothermal Technology Program (GTP), emphasis was shifted to interpretive tool development, testing, and validation. Subsurface modeling capabilities are an important component of this project for both the design of suitable tracers and the interpretation of data from in situ tracer tests, be they single- or multi-well tests. The purpose of this report is to describe the results of the tracer and model development for simulating and conducting tracer tests for characterizing EGS parameters.

  3. Evaluation of a superheater enhanced geothermal steam power plant in the Geysers area. Final report

    SciTech Connect (OSTI)

    Janes, J.

    1984-06-01

    This study was conducted to determine the attainable generation increase and to evaluate the economic merits of superheating the steam that could be used in future geothermal steam power plants in the Geyser-Calistoga Known Geothermal Resource Area (KGRA). It was determined that using a direct gas-fired superheater offers no economic advantages over the existing geothermal power plants. If the geothermal steam is heated to 900/sup 0/F by using the exhaust energy from a gas turbine of currently available performance, the net reference plant output would increase from 65 MW to 159 MW (net). Such hybrid plants are cost effective under certain conditions identified in this document. The power output from the residual Geyser area steam resource, now equivalent to 1437 MW, would be more than doubled by employing in the future gas turbine enhancement. The fossil fuel consumed in these plants would be used more efficiently than in any other fossil-fueled power plant in California. Due to an increase in evaporative losses in the cooling towers, the viability of the superheating concept is contingent on development of some of the water resources in the Geysers-Calistoga area to provide the necessary makeup water.

  4. Enhanced Geothermal Systems (EGS) Well Construction Technology Evaluation Report

    SciTech Connect (OSTI)

    Polsky, Yarom; Capuano, Louis; Finger, John; Huh, Michael; Knudsen, Steve; Chip, A.J. Mansure; Raymond, David; Swanson, Robert

    2008-12-01

    This report provides an assessment of well construction technology for EGS with two primary objectives: 1. Determining the ability of existing technologies to develop EGS wells. 2. Identifying critical well construction research lines and development technologies that are likely to enhance prospects for EGS viability and improve overall economics.

  5. Dynamic near-field optical interaction between oscillating nanomechanical structures

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ahn, Phillip; Chen, Xiang; Zhang, Zhen; Ford, Matthew; Rosenmann, Daniel; Jung, II Woong; Sun, Cheng; Balogun, Oluwaseyi

    2015-05-27

    Near-field optical techniques exploit light-matter interactions at small length scales for mechanical sensing and actuation of nanomechanical structures. Here, we study the optical interaction between two mechanical oscillators—a plasmonic nanofocusing probe-tip supported by a low frequency cantilever, and a high frequency nanomechanical resonator—and leverage their interaction for local detection of mechanical vibrations. The plasmonic nanofocusing probe provides a confined optical source to enhance the interaction between the two oscillators. Dynamic perturbation of the optical cavity between the probe-tip and the resonator leads to nonlinear modulation of the scattered light intensity at the sum and difference of their frequencies. This double-frequencymore » demodulation scheme is explored to suppress unwanted background and to detect mechanical vibrations with a minimum detectable displacement sensitivity of 0.45pm/Hz1/2, which is limited by shot noise and electrical noise. We explore the demodulation scheme for imaging the bending vibration mode shape of the resonator with a lateral spatial resolution of 20nm. We also demonstrate the time-resolved aspect of the local optical interaction by recording the ring-down vibrations of the resonator at frequencies of up to 129MHz. The near-field optical technique is promising for studying dynamic mechanical processes in individual nanostructures.« less

  6. Dynamic near-field optical interaction between oscillating nanomechanical structures

    SciTech Connect (OSTI)

    Ahn, Phillip; Chen, Xiang; Zhang, Zhen; Ford, Matthew; Rosenmann, Daniel; Jung, II Woong; Sun, Cheng; Balogun, Oluwaseyi

    2015-05-27

    Near-field optical techniques exploit light-matter interactions at small length scales for mechanical sensing and actuation of nanomechanical structures. Here, we study the optical interaction between two mechanical oscillators—a plasmonic nanofocusing probe-tip supported by a low frequency cantilever, and a high frequency nanomechanical resonator—and leverage their interaction for local detection of mechanical vibrations. The plasmonic nanofocusing probe provides a confined optical source to enhance the interaction between the two oscillators. Dynamic perturbation of the optical cavity between the probe-tip and the resonator leads to nonlinear modulation of the scattered light intensity at the sum and difference of their frequencies. This double-frequency demodulation scheme is explored to suppress unwanted background and to detect mechanical vibrations with a minimum detectable displacement sensitivity of 0.45pm/Hz1/2, which is limited by shot noise and electrical noise. We explore the demodulation scheme for imaging the bending vibration mode shape of the resonator with a lateral spatial resolution of 20nm. We also demonstrate the time-resolved aspect of the local optical interaction by recording the ring-down vibrations of the resonator at frequencies of up to 129MHz. The near-field optical technique is promising for studying dynamic mechanical processes in individual nanostructures.

  7. Simulation of Enhanced Geothermal Systems: A Benchmarking and Code Intercomparison Study

    SciTech Connect (OSTI)

    Scheibe, Timothy D.; White, Mark D.; White, Signe K.; Sivaramakrishnan, Chandrika; Purohit, Sumit; Black, Gary D.; Podgorney, Robert; Boyd, Lauren W.; Phillips, Benjamin R.

    2013-06-30

    Numerical simulation codes have become critical tools for understanding complex geologic processes, as applied to technology assessment, system design, monitoring, and operational guidance. Recently the need for quantitatively evaluating coupled Thermodynamic, Hydrologic, geoMechanical, and geoChemical (THMC) processes has grown, driven by new applications such as geologic sequestration of greenhouse gases and development of unconventional energy sources. Here we focus on Enhanced Geothermal Systems (EGS), which are man-made geothermal reservoirs created where hot rock exists but there is insufficient natural permeability and/or pore fluids to allow efficient energy extraction. In an EGS, carefully controlled subsurface fluid injection is performed to enhance the permeability of pre-existing fractures, which facilitates fluid circulation and heat transport. EGS technologies are relatively new, and pose significant simulation challenges. To become a trusted analytical tool for EGS, numerical simulation codes must be tested to demonstrate that they adequately represent the coupled THMC processes of concern. This presentation describes the approach and status of a benchmarking and code intercomparison effort currently underway, supported by the U. S. Department of Energys Geothermal Technologies Program. This study is being closely coordinated with a parallel international effort sponsored by the International Partnership for Geothermal Technology (IPGT). We have defined an extensive suite of benchmark problems, test cases, and challenge problems, ranging in complexity and difficulty, and a number of modeling teams are applying various simulation tools to these problems. The descriptions of the problems and modeling results are being compiled using the Velo framework, a scientific workflow and data management environment accessible through a simple web-based interface.

  8. Near-field/altered-zone models report

    SciTech Connect (OSTI)

    Hardin, E. L., LLNL

    1998-03-01

    lithophysal units. These units are made up of moderately to densely welded, devitrified, fractured tuff. The rock's chemical composition is comparable to that of typical granite, but has textural features and mineralogical characteristics of large-scale, silicic volcanism. Because the repository horizon will be approximately 300 m below the ground surface and 200 m above the water table, the repository will be partially saturated. The welded tuff matrix in the host units is highly impermeable, but water and gas flow readily through fractures. The degree of fracturing in these units is highly variable, and the hydrologic significance of fracturing is an important aspect of site investigation. This report describes the characterization and modeling of a region around the potential repository--the altered zone--a region in which the temperature will be increased significantly by waste-generated heat. Numerical simulation has shown that, depending on the boundary conditions, rock properties, and repository design features incorporated in the models, the altered zone (AZ) may extend from the water table to the ground surface. This report also describes models of the near field, the region comprising the repository emplacement drifts and the surrounding rock, which are critical to the performance of engineered components. Investigations of near-field and altered-zone (NF/AZ) processes support the design of underground repository facilities and engineered barriers and also provide constraint data for probabilistic calculations of waste-isolation performance (i.e., performance assessment). The approach to investigation, which is an iterative process involving hypothesis testing and experimentation, has relied on conceptualizing engineered barriers and on performance analysis. This report is a collection, emphasizing conceptual and numerical models, of the recent results contributed from studies of NF/AZ processes and of quantitative measures of NF/AZ performance. The selection and

  9. NREL: Geothermal Technologies - Capabilities

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Capabilities The NREL geothermal team leverages its capabilities in several different areas to enhance the visibility of geothermal technologies. These areas include low-temperature resources; enhanced geothermal systems; strategic planning, analysis, and modeling; and project assessment. Low-Temperature Geothermal Resources NREL works to develop and deploy innovative new technologies that will help the geothermal community achieve widespread adoption of under-utilized low-temperature resources

  10. Environmentally Friendly, Rheoreversible, Hydraulic-fracturing Fluids for Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Shao, Hongbo; Kabilan, Senthil; Stephens, Sean A.; Suresh, Niraj; Beck, Anthon NR; Varga, Tamas; Martin, Paul F.; Kuprat, Andrew P.; Jung, Hun Bok; Um, Wooyong; Bonneville, Alain; Heldebrant, David J.; Carroll, KC; Moore, Joseph; Fernandez, Carlos A.

    2015-07-01

    Cost-effective creation of high-permeability reservoirs inside deep crystalline bedrock is the primary challenge for the feasibility of enhanced geothermal systems (EGS). Current reservoir stimulation entails adverse environmental impacts and substantial economic costs due to the utilization of large volumes of water “doped” with chemicals including rheology modifiers, scale and corrosion inhibitors, biocides, friction reducers among others where, typically, little or no information of composition and toxicity is disclosed. An environmentally benign, CO2-activated, rheoreversible fracturing fluid has recently been developed that significantly enhances rock permeability at effective stress significantly lower than current technology. We evaluate the potential of this novel fracturing fluid for application on geothermal sites under different chemical and geomechanical conditions, by performing laboratory-scale fracturing experiments with different rock sources under different confining pressures, temperatures, and pH environments. The results demonstrate that CO2-reactive aqueous solutions of environmentally amenable Polyallylamine (PAA) represent a highly versatile fracturing fluid technology. This fracturing fluid creates/propagates fracture networks through highly impermeable crystalline rock at significantly lower effective stress as compared to control experiments where no PAA was present, and permeability enhancement was significantly increased for PAA compared to conventional hydraulic fracturing controls. This was evident in all experiments, including variable rock source/type, operation pressure and temperature (over the entire range for EGS applications), as well as over a wide range of formation-water pH values. This versatile novel fracturing fluid technology represents a great alternative to industrially available fracturing fluids for cost-effective and competitive geothermal energy production.

  11. A unidirectional subwavelength focusing near-field plate

    SciTech Connect (OSTI)

    Imani, Mohammadreza F.; Grbic, Anthony

    2014-01-28

    Near-field plates consist of non-periodically patterned surfaces that can overcome the diffraction limit and confine electromagnetic fields to subwavelength dimensions. Previous near-field plates experimentally demonstrated extreme field tailoring capabilities. However, their performance suffered from radiation/reflection in undesired directions, those other than the subwavelength focus. This issue can limit the practical use of near-field plates. In this paper, we address this issue by designing a unidirectional near-field plate that can form a subwavelength focal pattern, while suppressing the field radiated/reflected in other directions. The design and operation of the proposed unidirectional near-field plate are verified through full-wave simulation. The unidirectional near-field plate may find application in high resolution imaging and probing, high density data storage, and wireless power transfer systems. As an example, its utility as a high resolution probe is demonstrated through full-wave electromagnetic simulation.

  12. Low-Temperature Enhanced Geothermal System using Carbon Dioxide as the Heat-Transfer Fluid

    SciTech Connect (OSTI)

    Eastman, Alan D.

    2014-07-24

    This report describes work toward a supercritical CO2-based EGS system at the St. Johns Dome in Eastern Arizona, including a comprehensive literature search on CO2-based geothermal technologies, background seismic study, geological information, and a study of the possible use of metal oxide heat carriers to enhance the heat capacity of sCO2. It also includes cost estimates for the project, and the reasons why the project would probably not be cost effective at the proposed location.

  13. Temporary Bridging Agents for use in Drilling and Completion of Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Watters, Larry; Watters, Jeff; Sutton, Joy; Combs, Kyle; Bour, Daniel; Petty, Susan; Rose, Peter; Mella, Michael

    2011-12-21

    CSI Technologies, in conjunction with Alta Rock Energy and the University of Utah have undergone a study investigating materials and mechanisms with potential for use in Enhanced Geothermal Systems wells as temporary diverters or lost circulation materials. Studies were also conducted with regards to particle size distribution and sealing effectiveness using a lab-scale slot testing apparatus to simulate fractures. From the slot testing a numerical correlation was developed to determine the optimal PSD for a given fracture size. Field trials conducted using materials from this study were also successful.

  14. High-Resolution Photocurrent Microscopy Using Near-FieldCathodolumine...

    Office of Scientific and Technical Information (OSTI)

    High-Resolution Photocurrent Microscopy Using Near-Field Cathodoluminescence of Quantum Dots. Citation Details In-Document Search Title: High-Resolution Photocurrent Microscopy ...

  15. Geothermal Energy | Department of Energy

    Broader source: Energy.gov (indexed) [DOE]

    ... to produce and disseminate both the exploration gap analysis and Enhanced Geothermal ... 1 megawatt) power generation geothermal projects; sources of useful information including ...

  16. Fracture Propagation and Permeability Change under Poro-thermoelastic Loads & Silica Reactivity in Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Ahmad Ghassemi

    2009-10-01

    Geothermal energy is recovered by circulating water through heat exchange areas within a hot rock mass. Geothermal reservoir rock masses generally consist of igneous and metamorphic rocks that have low matrix permeability. Therefore, cracks and fractures play a significant role in extraction of geothermal energy by providing the major pathways for fluid flow and heat exchange. Therefore, knowledge of the conditions leading to formation of fractures and fracture networks is of paramount importance. Furthermore, in the absence of natural fractures or adequate connectivity, artificial fractures are created in the reservoir using hydraulic fracturing. Multiple fractures are preferred because of the large size necessary when using only a single fracture. Although the basic idea is rather simple, hydraulic fracturing is a complex process involving interactions of high pressure fluid injections with a stressed hot rock mass, mechanical interaction of induced fractures with existing natural fractures, and the spatial and temporal variations of in-situ stress. As a result, it is necessary to develop tools that can be used to study these interactions as an integral part of a comprehensive approach to geothermal reservoir development, particularly enhanced geothermal systems. In response to this need we have developed advanced poro-thermo-chemo-mechanical fracture models for rock fracture research in support of EGS design. The fracture propagation models are based on a regular displacement discontinuity formulation. The fracture propagation studies include modeling interaction of induced fractures. In addition to the fracture propagation studies, two-dimensional solution algorithms have been developed and used to estimate the impact of pro-thermo-chemical processes on fracture permeability and reservoir pressure. Fracture permeability variation is studied using a coupled thermo-chemical model with quartz reaction kinetics. The model is applied to study quartz precipitation

  17. Category:Geothermal Technologies | Open Energy Information

    Open Energy Info (EERE)

    out of 7 total. C Co-Produced Geothermal Systems E Enhanced Geothermal Systems (EGS) G Geothermal Direct Use G cont. GeothermalExploration Ground Source Heat Pumps H...

  18. Resonance hybridization and near field properties of strongly coupled plasmonic ring dimer-rod nanosystem

    SciTech Connect (OSTI)

    Koya, Alemayehu Nana; Ji, Boyu; Hao, Zuoqiang; Lin, Jingquan

    2015-09-21

    Combined effects of polarization, split gap, and rod width on the resonance hybridization and near field properties of strongly coupled gold dimer-rod nanosystem are comparatively investigated in the light of the constituent nanostructures. By aligning polarization of the incident light parallel to the long axis of the nanorod, introducing small split gaps to the dimer walls, and varying width of the nanorod, we have simultaneously achieved resonance mode coupling, huge near field enhancement, and prolonged plasmon lifetime. As a result of strong coupling between the nanostructures and due to an intense confinement of near fields at the split and dimer-rod gaps, the extinction spectrum of the coupled nanosystem shows an increase in intensity and blueshift in wavelength. Consequently, the near field lifespan of the split-nanosystem is prolonged in contrast to the constituent nanostructures and unsplit-nanosystem. On the other hand, for polarization of the light perpendicular to the long axis of the nanorod, the effect of split gap on the optical responses of the coupled nanosystem is found to be insignificant compared to the parallel polarization. These findings and such geometries suggest that coupling an array of metallic split-ring dimer with long nanorod can resolve the huge radiative loss problem of plasmonic waveguide. In addition, the Fano-like resonances and immense near field enhancements at the split and dimer-rod gaps imply the potentials of the nanosystem for practical applications in localized surface plasmon resonance spectroscopy and sensing.

  19. NREL: Geothermal Technologies - Projects

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Projects The NREL geothermal team is involved in various projects to help accelerate the development and deployment of clean, renewable geothermal technologies, including low-temperature resources; enhanced geothermal systems; strategic planning, analysis, and modeling; and project assessment. Low-Temperature Geothermal Resources NREL supports the U.S. Department of Energy's (DOE) Geothermal Technologies Office (GTO) through various collaborations that evaluate the levelized cost of electricity

  20. Geothermal Technologies Office April

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Annual Report Geothermal Technologies Office April 2016 1 2015 Annual Report | Geothermal Technologies Office Director's Message Geothermal Technologies Office FY 2016 Budget at a Glance Enhanced Geothermal Systems Hydrothermal Program Low-Temperature and Coproduced Resources Systems Analysis Events and Highlights People Acronyms Resources Table of Contents 2 2 3 7 13 17 19 23 26 28 2015 Achievements Geothermal Technologies Office Steam, West Flank of Coso, NV The 2015 Annual Report of the

  1. Numerical studies of fluid-rock interactions in EnhancedGeothermal...

    Office of Scientific and Technical Information (OSTI)

    Subject: 15; CARBON; DISSOLUTION; ENERGY RECOVERY; GEOTHERMAL SYSTEMS; HEAT EXTRACTION; HEAT TRANSFER; POWER GENERATION; PRECIPITATION; RESERVOIR ENGINEERING; STORAGE; TRANSPORT; ...

  2. Michrohole Arrays Drilled with Advanced Abrasive Slurry Jet Technology to Efficiently Exploit Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Oglesby, Kenneth; Finsterle, Stefan; Zhang, Yingqi; Pan, Lehua; Dobson, Parick; Mohan, Ram; Shoham, Ovadia; Felber, Betty; Rychel, Dwight

    2014-03-12

    This project had two major areas of research for Engineered/ Enhanced Geothermal System (EGS) development - 1) study the potential benefits from using microholes (i.e., bores with diameters less than 10.16 centimeters/ 4 inches) and 2) study FLASH ASJ to drill/ install those microbores between a well and a fracture system. This included the methods and benefits of drilling vertical microholes for exploring the EGS reservoir and for installing multiple (forming an array of) laterals/ directional microholes for creating the in-reservoir heat exchange flow paths. Significant benefit was found in utilizing small microbore sized connecting bores for EGS efficiency and project life. FLASH ASJ was deemed too complicated to optimally work in such deep reservoirs at this time.

  3. THz near-field microscopy of graphene structures. (Conference...

    Office of Scientific and Technical Information (OSTI)

    Title: THz near-field microscopy of graphene structures. Abstract not provided. Authors: Pan, Wei ; Brener, Igal ; Mitrofanov, O ; Thompson, R ; Yu, W ; berger, c ; de heer, w.a. ; ...

  4. Enhanced Geothermal Systems Research and Development: Models of Subsurface Chemical Processes Affecting Fluid Flow

    SciTech Connect (OSTI)

    Moller, Nancy; Weare J. H.

    2008-05-29

    Successful exploitation of the vast amount of heat stored beneath the earth’s surface in hydrothermal and fluid-limited, low permeability geothermal resources would greatly expand the Nation’s domestic energy inventory and thereby promote a more secure energy supply, a stronger economy and a cleaner environment. However, a major factor limiting the expanded development of current hydrothermal resources as well as the production of enhanced geothermal systems (EGS) is insufficient knowledge about the chemical processes controlling subsurface fluid flow. With funding from past grants from the DOE geothermal program and other agencies, we successfully developed advanced equation of state (EOS) and simulation technologies that accurately describe the chemistry of geothermal reservoirs and energy production processes via their free energies for wide XTP ranges. Using the specific interaction equations of Pitzer, we showed that our TEQUIL chemical models can correctly simulate behavior (e.g., mineral scaling and saturation ratios, gas break out, brine mixing effects, down hole temperatures and fluid chemical composition, spent brine incompatibilities) within the compositional range (Na-K-Ca-Cl-SO4-CO3-H2O-SiO2-CO2(g)) and temperature range (T < 350°C) associated with many current geothermal energy production sites that produce brines with temperatures below the critical point of water. The goal of research carried out under DOE grant DE-FG36-04GO14300 (10/1/2004-12/31/2007) was to expand the compositional range of our Pitzer-based TEQUIL fluid/rock interaction models to include the important aluminum and silica interactions (T < 350°C). Aluminum is the third most abundant element in the earth’s crust; and, as a constituent of aluminosilicate minerals, it is found in two thirds of the minerals in the earth’s crust. The ability to accurately characterize effects of temperature, fluid mixing and interactions between major rock-forming minerals and hydrothermal and

  5. Stimuli Responsive/Rheoreversible Hydraulic Fracturing Fluids for Enhanced Geothermal Energy Production (Part II)

    SciTech Connect (OSTI)

    Bonneville, Alain; Jung, Hun Bok; Shao, Hongbo; Kabilan, Senthil; Um, Wooyong; Carroll, Kenneth C.; Varga, Tamas; Suresh, Niraj; Stephens, Sean A.; Fernandez, Carlos A.

    2014-12-14

    We have used an environmentally friendly and recyclable hydraulic fracturing fluid - diluted aqueous solutions of polyallylamine or PAA – for reservoir stimulation in Enhanced Geothermal System (EGS). This fluid undergoes a controlled and large volume expansion with a simultaneous increase in viscosity triggered by CO2 at EGS temperatures. We are presenting here the results of laboratory-scale hydraulic fracturing experiment using the fluid on small cylindrical rock cores (1.59 cm in diameter and 5.08 cm in length) from the Coso geothermal field in California. Rock samples consisted of Mesozoic diorite metamorphosed to greenschist facies. The experiments were conducted on 5 samples for realistic ranges of pressures (up to 275 bar) and temperatures (up to 210 °C) for both the rock samples and the injected fluid. After fracturing, cores were subjected to a CO2 leakage test, injection of KI solution, and X-ray microtomography (XMT) scanning to examine the formation and distribution of fractures. The design and conduct of these experiments will be presented and discussed in details. Based on the obtained XMT images, Computational Fluid Dynamics (CFD) simulations were then performed to visualize hydraulic fractures and compute the bulk permeability. OpenFOAM (OpenCFD Ltd., Reading, UK), was used to solve the steady state simulation. The flow predictions, based upon the laminar, 3-D, incompressible Navier-Stokes equations for fluid mass and momentum, show the remarkable stimulation of the permeability in the core samples and demonstrate the efficiency of such a CO2 triggered fluid in EGS.

  6. Conference Paper NFO-7:7th International Conference on Near-Field Optics and Related Technologies

    SciTech Connect (OSTI)

    Prof.Dr. Lukas Novotny

    2004-10-18

    The seventh conference in the NFO conference series, held here in Rochester, provided to be the principal forum for advances in sub-wavelength optics, near-field optical microscopy, local field enhancement, instrumental developments and the ever-increasing range of applications. This conference brought together the diverse scientific communities working on the theory and application of near-field optics (NFO) and related techniques.

  7. Accelerated Geothermal Resource Development in the Great Basin Through Enhanced Public Awareness and Outreach to Shareholders.

    SciTech Connect (OSTI)

    Taranik, James V.; Oppliger, Gary; Sawatsky, Don

    2002-04-10

    The Great Basin Center for Geothermal Energy conducted work encompassing two main tasks. We (1) produced a web-based, stakeholder geothermal information system for Nevada geothermal data relevant to assessing and developing geothermal resources, and (2) we held informational stakeholder workshops (both as part of GeoPowering the West Initiative). The objective of this grant was to conduct workshops and fund database and web development activities. This grant funds salaries for web and database developers and part of the administrative assistant who helps to coordinate and organize workshops, and maintain selected databases.

  8. SMU Geothermal Conference 2011 - Geothermal Technologies Program...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    SMU Geothermal Conference 2011 - Geothermal Technologies Program SMU Geothermal Conference 2011 - Geothermal Technologies Program DOE Geothermal Technologies Program presentation ...

  9. Near-field radiative heat transfer between metamaterials coated with silicon carbide thin films

    SciTech Connect (OSTI)

    Basu, Soumyadipta Yang, Yue; Wang, Liping

    2015-01-19

    In this letter, we study the near-field radiative heat transfer between two metamaterial substrates coated with silicon carbide (SiC) thin films. It is known that metamaterials can enhance the near-field heat transfer over ordinary materials due to excitation of magnetic plasmons associated with s polarization, while strong surface phonon polariton exists for SiC. By careful tuning of the optical properties of metamaterial, it is possible to excite electrical and magnetic resonances for the metamaterial and surface phonon polaritons for SiC at different spectral regions, resulting in the enhanced heat transfer. The effect of the SiC film thickness at different vacuum gaps is investigated. Results obtained from this study will be beneficial for application of thin film coatings for energy harvesting.

  10. Recovery Act. Development and Validation of an Advanced Stimulation Prediction Model for Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Gutierrez, Marte

    2013-12-31

    This research project aims to develop and validate an advanced computer model that can be used in the planning and design of stimulation techniques to create engineered reservoirs for Enhanced Geothermal Systems. The specific objectives of the proposal are to; Develop a true three-dimensional hydro-thermal fracturing simulator that is particularly suited for EGS reservoir creation; Perform laboratory scale model tests of hydraulic fracturing and proppant flow/transport using a polyaxial loading device, and use the laboratory results to test and validate the 3D simulator; Perform discrete element/particulate modeling of proppant transport in hydraulic fractures, and use the results to improve understand of proppant flow and transport; Test and validate the 3D hydro-thermal fracturing simulator against case histories of EGS energy production; and Develop a plan to commercialize the 3D fracturing and proppant flow/transport simulator. The project is expected to yield several specific results and benefits. Major technical products from the proposal include; A true-3D hydro-thermal fracturing computer code that is particularly suited to EGS; Documented results of scale model tests on hydro-thermal fracturing and fracture propping in an analogue crystalline rock; Documented procedures and results of discrete element/particulate modeling of flow and transport of proppants for EGS applications; and Database of monitoring data, with focus of Acoustic Emissions (AE) from lab scale modeling and field case histories of EGS reservoir creation.

  11. International Partnership for Geothermal Technology - 2012 Peer...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Validation of an Advanced Stimulation Prediction Model for Enhanced Geothermal Systems (EGS) Advanced 3D Geophysical Imaging Technologies for Geothermal Resource Characterization

  12. Direct measurement of optical force induced by near-field plasmonic cavity using dynamic mode AFM

    SciTech Connect (OSTI)

    Guan, Dongshi; Hang, Zhi Hong; Marset, Zsolt; Liu, Hui; Kravchenko, Ivan I.; Chan, Ho Bun; Chan, C. T.; Tong, Penger

    2015-11-20

    Plasmonic nanostructures have attracted much attention in recent years because of their potential applications in optical manipulation through near-field enhancement. Continuing experimental efforts have been made to develop accurate techniques to directly measure the near-field optical force induced by the plasmonic nanostructures in the visible frequency range. In this work, we report a new application of dynamic mode atomic force microscopy (DM-AFM) in the measurement of the enhanced optical force acting on a nano-structured plasmonic resonant cavity. The plasmonic cavity is made of an upper gold-coated glass sphere and a lower quartz substrate patterned with an array of subwavelength gold disks. In the near-field when the sphere is positioned close to the disk array, plasmonic resonance is excited in the cavity and the induced force by a 1550 nm infrared laser is found to be increased by an order of magnitude compared with the photon pressure generated by the same laser light. Lastly, the experiment demonstrates that DM-AFM is a powerful tool for the study of light induced forces and their enhancement in plasmonic nanostructures.

  13. Direct measurement of optical force induced by near-field plasmonic cavity using dynamic mode AFM

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Guan, Dongshi; Hang, Zhi Hong; Marset, Zsolt; Liu, Hui; Kravchenko, Ivan I.; Chan, Ho Bun; Chan, C. T.; Tong, Penger

    2015-11-20

    Plasmonic nanostructures have attracted much attention in recent years because of their potential applications in optical manipulation through near-field enhancement. Continuing experimental efforts have been made to develop accurate techniques to directly measure the near-field optical force induced by the plasmonic nanostructures in the visible frequency range. In this work, we report a new application of dynamic mode atomic force microscopy (DM-AFM) in the measurement of the enhanced optical force acting on a nano-structured plasmonic resonant cavity. The plasmonic cavity is made of an upper gold-coated glass sphere and a lower quartz substrate patterned with an array of subwavelength goldmore » disks. In the near-field when the sphere is positioned close to the disk array, plasmonic resonance is excited in the cavity and the induced force by a 1550 nm infrared laser is found to be increased by an order of magnitude compared with the photon pressure generated by the same laser light. Lastly, the experiment demonstrates that DM-AFM is a powerful tool for the study of light induced forces and their enhancement in plasmonic nanostructures.« less

  14. Geology of Injection Well 46A-19RD in the Coso Enhanced Geothermal...

    Open Energy Info (EERE)

    altered. This fault zone is a prime target for stimulation. Authors Kovac, K.M.; Moore, J.N.; Rose, P.E.; McCulloch and J. Published Geothermal Resource Council Transactions...

  15. Detection and Characterization of Natural and Induced Fractures for the Development of Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    Project objectives: Combine geophysical methods for reservoir and fracture characterization with rock physics measurements made under in-situ conditions (up to 350⁰C) for development of geothermal systems.

  16. 3?m aperture probes for near-field terahertz transmission microscopy...

    Office of Scientific and Technical Information (OSTI)

    3?m aperture probes for near-field terahertz transmission microscopy. Citation Details In-Document Search Title: 3?m aperture probes for near-field terahertz transmission ...

  17. Mechanical Behavior of the Near-field Host Rock Surrounding Excavation...

    Office of Scientific and Technical Information (OSTI)

    Mechanical Behavior of the Near-field Host Rock Surrounding Excavations Citation Details In-Document Search Title: Mechanical Behavior of the Near-field Host Rock Surrounding ...

  18. Near-field effects of asteroid impacts in deep water

    SciTech Connect (OSTI)

    Gisler, Galen R; Weaver, Robert P; Gittings, Michael L

    2009-06-11

    Our previous work has shown that ocean impacts of asteroids below 500 m in diameter do not produce devastating long-distance tsunamis. Nevertheless, a significant portion of the ocean lies close enough to land that near-field effects may prove to be the greatest danger from asteroid impacts in the ocean. Crown splashes and central jets that rise up many kilometres into the atmosphere can produce, upon their collapse, highly non-linear breaking waves that could devastate shorelines within a hundred kilometres of the impact site. We present illustrative calculations, in two and three dimensions, of such impacts for a range of asteroid sizes and impact angles. We find that, as for land impacts, the greatest dangers from oceanic impacts are the short-term near-field, and long-term atmospheric effects.

  19. Near-field NanoThermoMechanical memory

    SciTech Connect (OSTI)

    Elzouka, Mahmoud; Ndao, Sidy

    2014-12-15

    In this letter, we introduce the concept of NanoThermoMechanical Memory. Unlike electronic memory, a NanoThermoMechanical memory device uses heat instead of electricity to record, store, and recover data. Memory function is achieved through the coupling of near-field thermal radiation and thermal expansion resulting in negative differential thermal resistance and thermal latching. Here, we demonstrate theoretically via numerical modeling the concept of near-field thermal radiation enabled negative differential thermal resistance that achieves bistable states. Design and implementation of a practical silicon based NanoThermoMechanical memory device are proposed along with a study of its dynamic response under write/read cycles. With more than 50% of the world's energy losses being in the form of heat along with the ever increasing need to develop computer technologies which can operate in harsh environments (e.g., very high temperatures), NanoThermoMechanical memory and logic devices may hold the answer.

  20. Stanford Geothermal Workshop - Geothermal Technologies Office...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    - Geothermal Technologies Office Stanford Geothermal Workshop - Geothermal Technologies Office Presentation by Geothermal Technologies Director Doug Hollett at the Stanford ...

  1. Laminar and turbulent nozzle-jet flows and their acoustic near-field

    SciTech Connect (OSTI)

    Bhler, Stefan; Obrist, Dominik; Kleiser, Leonhard

    2014-08-15

    We investigate numerically the effects of nozzle-exit flow conditions on the jet-flow development and the near-field sound at a diameter-based Reynolds number of Re{sub D} = 18?100 and Mach number Ma = 0.9. Our computational setup features the inclusion of a cylindrical nozzle which allows to establish a physical nozzle-exit flow and therefore well-defined initial jet-flow conditions. Within the nozzle, the flow is modeled by a potential flow core and a laminar, transitional, or developing turbulent boundary layer. The goal is to document and to compare the effects of the different jet inflows on the jet flow development and the sound radiation. For laminar and transitional boundary layers, transition to turbulence in the jet shear layer is governed by the development of Kelvin-Helmholtz instabilities. With the turbulent nozzle boundary layer, the jet flow development is characterized by a rapid changeover to a turbulent free shear layer within about one nozzle diameter. Sound pressure levels are strongly enhanced for laminar and transitional exit conditions compared to the turbulent case. However, a frequency and frequency-wavenumber analysis of the near-field pressure indicates that the dominant sound radiation characteristics remain largely unaffected. By applying a recently developed scaling procedure, we obtain a close match of the scaled near-field sound spectra for all nozzle-exit turbulence levels and also a reasonable agreement with experimental far-field data.

  2. 300°C Capable Electronics Platform and Temperature Sensor System For Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    Project objectives: Enable geothermal wellbore monitoring through the development of SiC based electronics and ceramic packaging capable of sustained operation at temperatures up to 300˚C and 10 km depth. Demonstrate the technology with a temperature sensor system.

  3. Fracture Characterization in Enhanced Geothermal Systems by Wellbore and Reservoir Analysis

    SciTech Connect (OSTI)

    Horne, Roland N.; Li, Kewen; Alaskar, Mohammed; Ames, Morgan; Co, Carla; Juliusson, Egill; Magnusdottir, Lilja

    2012-06-30

    This report highlights the work that was done to characterize fractured geothermal reservoirs using production data. That includes methods that were developed to infer characteristic functions from production data and models that were designed to optimize reinjection scheduling into geothermal reservoirs, based on these characteristic functions. The characterization method provides a robust way of interpreting tracer and flow rate data from fractured reservoirs. The flow-rate data are used to infer the interwell connectivity, which describes how injected fluids are divided between producers in the reservoir. The tracer data are used to find the tracer kernel for each injector-producer connection. The tracer kernel describes the volume and dispersive properties of the interwell flow path. A combination of parametric and nonparametric regression methods were developed to estimate the tracer kernels for situations where data is collected at variable flow-rate or variable injected concentration conditions. The characteristic functions can be used to calibrate thermal transport models, which can in turn be used to predict the productivity of geothermal systems. This predictive model can be used to optimize injection scheduling in a geothermal reservoir, as is illustrated in this report.

  4. Development of Advanced Thermal-Hydrological-Mechanical-Chemical (THMC) Modeling Capabilities for Enhanced Geothermal Systems

    Broader source: Energy.gov [DOE]

    Project objectives: Develop a general framework for effective flow of water, steam and heat in in porous and fractured geothermal formations. Develop a computational module for handling coupled effects of pressure, temperature, and induced rock deformations. Develop a reliable model of heat transfer and fluid flow in fractured rocks.

  5. IEA-GIA ExCo - National Geothermal Data System and Online Tools

    Broader source: Energy.gov (indexed) [DOE]

    ... To advance remote temperature prediction ... Induced Seismicity in Enhanced Geothermal Systems Array Information Technology ... Geothermal Energy Conference * US Draft Induced ...

  6. Unidirectional wireless power transfer using near-field plates

    SciTech Connect (OSTI)

    Imani, Mohammadreza F.; Grbic, Anthony

    2015-05-14

    One of the obstacles preventing wireless power transfer from becoming ubiquitous is their leakage of power: high-amplitude electromagnetic fields that can interfere with other electronic devices, increase health concerns, or hinder power metering. In this paper, we present near-field plates (NFPs) as a novel method to tailor the electromagnetic fields generated by a wireless power transfer system while maintaining high efficiency. NFPs are modulated arrays or surfaces designed to form prescribed near-field patterns. The NFP proposed in this paper consists of an array of loaded loops that are designed to confine the electromagnetic fields of a resonant transmitting loop to the desired direction (receiving loop) while suppressing fields in other directions. The step-by-step design procedure for this device is outlined. Two NFPs are designed and examined in full-wave simulation. Their performance is shown to be in close agreement with the design predictions, thereby verifying the proposed design and operation. A NFP is also fabricated and experimentally shown to form a unidirectional wireless power transfer link with high efficiency.

  7. Baseline System Costs for 50.0 MW Enhanced Geothermal System -- A Function of: Working Fluid, Technology, and Location, Location, Location

    SciTech Connect (OSTI)

    Dunn, Paul; Selman, Nancy; Volpe, Anthony Della; Moss, Deborah; Mobley, Rick; Dickey, Halley; Unruh, Jeffery; Hitchcock, Chris; Tanguay, Jasmine; Butler, Steven; Stacey, Robert; Robertson-Tait, Ann; Pruess, Karsten; Gutoski, Greg; Fay, Jamie M.; Stitzer, John T.; Oglesby, Ken

    2012-04-30

    Substantial unexploited opportunity exists for the US, and the world, in Enhanced Geothermal Systems (EGS). As a result of US DOE investment, new drilling technology, new power generation equipment and cycles enable meaningful power production, in a compact and modular fashion; at lower and lower top side EGS working fluid temperatures and in a broader range of geologies and geographies. This cost analysis effort supports the expansion of Enhanced Geothermal Systems (EGS), furthering DOE strategic themes of energy security and sub goal of energy diversity; reducing the Nation's dependence on foreign oil while improving the environment.

  8. Iceland Geothermal Conference 2013 - Geothermal Policies and...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Iceland Geothermal Conference 2013 - Geothermal Policies and Impacts in the U.S. Iceland Geothermal Conference 2013 - Geothermal Policies and Impacts in the U.S. Iceland Geothermal ...

  9. Development of an Advanced Stimulation / Production Predictive Simulator for Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Pritchett, John W.

    2015-04-15

    There are several well-known obstacles to the successful deployment of EGS projects on a commercial scale, of course. EGS projects are expected to be deeper, on the average, than conventional “natural” geothermal reservoirs, and drilling costs are already a formidable barrier to conventional geothermal projects. Unlike conventional resources (which frequently announce their presence with natural manifestations such as geysers, hot springs and fumaroles), EGS prospects are likely to appear fairly undistinguished from the earth surface. And, of course, the probable necessity of fabricating a subterranean fluid circulation network to mine the heat from the rock (instead of simply relying on natural, pre-existing permeable fractures) adds a significant degree of uncertainty to the prospects for success. Accordingly, the basic motivation for the work presented herein was to try to develop a new set of tools that would be more suitable for this purpose. Several years ago, the Department of Energy’s Geothermal Technologies Office recognized this need and funded a cost-shared grant to our company (then SAIC, now Leidos) to partner with Geowatt AG of Zurich, Switzerland and undertake the development of a new reservoir simulator that would be more suitable for EGS forecasting than the existing tools. That project has now been completed and a new numerical geothermal reservoir simulator has been developed. It is named “HeatEx” (for “Heat Extraction”) and is almost completely new, although its methodology owes a great deal to other previous geothermal software development efforts, including Geowatt’s “HEX-S” code, the STAR and SPFRAC simulators developed here at SAIC/Leidos, the MINC approach originally developed at LBNL, and tracer analysis software originally formulated at INEL. Furthermore, the development effort was led by engineers with many years of experience in using reservoir simulation software to make meaningful forecasts for real geothermal

  10. Baseline System Costs for 50.0 MW Enhanced Geothermal System--A Function of: Working Fluid, Technology, and Location, Location, Location

    Broader source: Energy.gov [DOE]

    Project objectives: Develop a baseline cost model of a 50.0 MW Enhanced Geothermal System, including all aspects of the project, from finding the resource through to operation, for a particularly challenging scenario: the deep, radioactively decaying granitic rock of the Pioneer Valley in Western Massachusetts.

  11. Accelerating Geothermal Research (Fact Sheet)

    SciTech Connect (OSTI)

    Not Available

    2014-05-01

    Geothermal research at the National Renewable Energy Laboratory (NREL) is advancing geothermal technologies to increase renewable power production. Continuous and not dependent on weather, the geothermal resource has the potential to jump to more than 500 gigawatts in electricity production, which is equivalent to roughly half of the current U.S. capacity. Enhanced geothermal systems have a broad regional distribution in the United States, allowing the potential for development in many locations across the country.

  12. Geographic Information Systems- Tools For Geotherm Exploration...

    Open Energy Info (EERE)

    Information Systems- Tools For Geotherm Exploration, Tracers Data Analysis, And Enhanced Data Distribution, Visualization, And Management Abstract Geographic information...

  13. Creation of an Enhanced Geothermal System through Hydraulic and Thermal Stimulation

    SciTech Connect (OSTI)

    Rose, Peter Eugene

    2013-04-15

    This report describes a 10-year DOE-funded project to design, characterize and create an Engineered Geothermal System (EGS) through a combination of hydraulic, thermal and chemical stimulation techniques. Volume 1 describes a four-year Phase 1 campaign, which focused on the east compartment of the Coso geothermal field. It includes a description of the geomechanical, geophysical, hydraulic, and geochemical studies that were conducted to characterize the reservoir in anticipation of the hydraulic stimulation experiment. Phase 1 ended prematurely when the drill bit intersected a very permeable fault zone during the redrilling of target stimulation well 34-9RD2. A hydraulic stimulation was inadvertently achieved, however, since the flow of drill mud from the well into the formation created an earthquake swarm near the wellbore that was recorded, located, analyzed and interpreted by project seismologists. Upon completion of Phase 1, the project shifted focus to a new target well, which was located within the southwest compartment of the Coso geothermal field. Volume 2 describes the Phase 2 studies on the geomechanical, geophysical, hydraulic, and geochemical aspects of the reservoir in and around target-stimulation well 46A-19RD, which is the deepest and hottest well ever drilled at Coso. Its total measured depth exceeding 12,000 ft. It spite of its great depth, this well is largely impermeable below a depth of about 9,000 ft, thus providing an excellent target for stimulation. In order to prepare 46A-19RD for stimulation, however, it was necessary to pull the slotted liner. This proved to be unachievable under the budget allocated by the Coso Operating Company partners, and this aspect of the project was abandoned, ending the program at Coso. The program then shifted to the EGS project at Desert Peak, which had a goal similar to the one at Coso of creating an EGS on the periphery of an existing geothermal reservoir. Volume 3 describes the activities that the Coso team

  14. Enhancing Condensers for Geothermal Systems: the Effect of High Contact Angles on Dropwise Condensation Heat Transfer

    SciTech Connect (OSTI)

    Kennedy, John M.; Kim, Sunwoo; Kim, Kwang J.

    2009-10-06

    Phase change heat transfer is notorious for increasing the irreversibility of, and therefore decreasing the efficiency of, geothermal power plants. Its significant contribution to the overall irreversibility of the plant makes it the most important source of inefficiency in the process. Recent studies here have shown the promotion of drop wise condensation in the lab by means of increasing the surface energy density of a tube with nanotechnology. The use of nanotechnology has allowed the creation of surface treatments which discourage water from wetting a tube surface during a static test. These surface treatments are unique in that they create high- contact angles on the condensing tube surfaces to promote drop wise condensation.

  15. Creation of an Enhanced Geothermal System through Hydraulic and Thermal Stimulation

    SciTech Connect (OSTI)

    Rose, Peter Eugene

    2013-04-15

    This report describes a 10-year DOE-funded project to design, characterize and create an Engineered Geothermal System (EGS) through a combination of hydraulic, thermal and chemical stimulation techniques. Volume 1 describes a four-year Phase 1 campaign, which focused on the east compartment of the Coso geothermal field. It includes a description of the geomechanical, geophysical, hydraulic, and geochemical studies that were conducted to characterize the reservoir in anticipation of the hydraulic stimulation experiment. Phase 1 ended prematurely when the drill bit intersected a very permeable fault zone during the redrilling of target stimulation well 34-9RD2. A hydraulic stimulation was inadvertently achieved, however, since the flow of drill mud from the well into the formation created an earthquake swarm near the wellbore that was recorded, located, analyzed and interpreted by project seismologists. Upon completion of Phase 1, the project shifted focus to a new target well, which was located within the southwest compartment of the Coso geothermal field. Volume 2 describes the Phase 2 studies on the geomechanical, geophysical, hydraulic, and geochemical aspects of the reservoir in and around target-stimulation well 46A-19RD, which is the deepest and hottest well ever drilled at Coso. Its total measured depth exceeding 12,000 ft. It spite of its great depth, this well is largely impermeable below a depth of about 9,000 ft, thus providing an excellent target for stimulation. In order to prepare 46A-19RD for stimulation, however, it was necessary to pull the slotted liner. This proved to be unachievable under the budget allocated by the Coso Operating Company partners, and this aspect of the project was abandoned, ending the program at Coso. The program then shifted to the EGS project at Desert Peak, which had a goal similar to the one at Coso of creating an EGS on the periphery of an existing geothermal reservoir. Volume 3 describes the activities that the Coso team

  16. Heat Transfer and Fluid Transport of Supercritical CO2 in Enhanced Geothermal System with Local Thermal Non-equilibrium Model

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Zhang, Le; Luo, Feng; Xu, Ruina; Jiang, Peixue; Liu, Huihai

    2014-12-31

    The heat transfer and fluid transport of supercritical CO2 in enhanced geothermal system (EGS) is studied numerically with local thermal non-equilibrium model, which accounts for the temperature difference between solid matrix and fluid components in porous media and uses two energy equations to describe heat transfer in the solid matrix and in the fluid, respectively. As compared with the previous results of our research group, the effect of local thermal non-equilibrium mainly depends on the volumetric heat transfer coefficient ah, which has a significant effect on the production temperature at reservoir outlet and thermal breakthrough time. The uniformity of volumetricmore » heat transfer coefficient ah has little influence on the thermal breakthrough time, but the temperature difference become more obvious with time after thermal breakthrough with this simulation model. The thermal breakthrough time reduces and the effect of local thermal non-equilibrium becomes significant with decreasing ah.« less

  17. Dipolar resonances in conductive carbon micro-fibers probed by near-field terahertz spectroscopy

    SciTech Connect (OSTI)

    Khromova, I.; Navarro-Cía, M.; Brener, I.; Reno, J. L.; Ponomarev, A.; Mitrofanov, O.

    2015-07-13

    In this study, we observe dipole resonances in thin conductive carbon micro-fibers by detecting an enhanced electric field in the near-field of a single fiber at terahertz (THz) frequencies. Time-domain analysis of the electric field shows that each fiber sustains resonant current oscillations at the frequency defined by the fiber's length. Strong dependence of the observed resonance frequency and degree of field enhancement on the fibers' conductive properties enable direct non-contact probing of the THz conductivity in single carbon micro-fibers. We find the conductivity of the fibers to be within the range of 1– 5∙104 S/m. This approach is suitable for experimental characterization of individual doped semiconductor resonators for THz metamaterials and devices.

  18. Dipolar resonances in conductive carbon micro-fibers probed by near-field terahertz spectroscopy

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Khromova, I.; Navarro-Cía, M.; Brener, I.; Reno, J. L.; Ponomarev, A.; Mitrofanov, O.

    2015-07-13

    In this study, we observe dipole resonances in thin conductive carbon micro-fibers by detecting an enhanced electric field in the near-field of a single fiber at terahertz (THz) frequencies. Time-domain analysis of the electric field shows that each fiber sustains resonant current oscillations at the frequency defined by the fiber's length. Strong dependence of the observed resonance frequency and degree of field enhancement on the fibers' conductive properties enable direct non-contact probing of the THz conductivity in single carbon micro-fibers. We find the conductivity of the fibers to be within the range of 1– 5∙104 S/m. This approach is suitablemore » for experimental characterization of individual doped semiconductor resonators for THz metamaterials and devices.« less

  19. Harsh Environment Silicon Carbide Sensor Technology for Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Carbonation Mechanism of Reservoir Rock by Supercritical Carbon Dioxide track 3: enhanced geothermal systems (EGS) | geothermal 2015 peer review Complete FiberCopper Cable ...

  20. A Revolutionary Hybrid Thermodynamic Cycle for Bianary Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    PDF icon hybridthermcyclepeer2013.pdf More Documents & Publications Working Fluids and Their Effect on Geothermal Turbines Tailored Working Fluids for Enhanced Binary Geothermal ...

  1. Purchase and Installation of a Geothermal Power Plant to Generate...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    feasibility of the use of an existing low-temperature geothermal resource for combined heat and power; and Maintain and enhance existing geothermal district heating operation. ...

  2. Concept Testing and Development at the Raft River Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    DOE 2010 Geothermal Technologies Program Peer Review egs007moore.pdf (181.39 KB) More Documents & Publications Demonstration of an Enhanced Geothermal System at the Northwest ...

  3. Mineral Recovery from Geothermal Fluids | Open Energy Information

    Open Energy Info (EERE)

    Metals and Compounds from Geothermal Fluids California Simbol Mining Corp. Recovery Act: Enhanced Geothermal Systems Component Research and DevelopmentAnalysis Albuquerque, NM,...

  4. Geothermal Energy Projects | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Geothermal Energy Projects Geothermal Energy Projects Geothermal Energy Projects Geothermal Energy Projects Geothermal Energy Projects Geothermal Energy Projects Geothermal Energy ...

  5. A novel mathematical model for controllable near-field electrospinning

    SciTech Connect (OSTI)

    Ru, Changhai E-mail: luojun@shu.edu.cn; Robotics and Microsystems Center, Soochow University, Suzhou 215021 ; Chen, Jie; Shao, Zhushuai; Pang, Ming; Luo, Jun E-mail: luojun@shu.edu.cn

    2014-01-15

    Near-field electrospinning (NFES) had better controllability than conventional electrospinning. However, due to the lack of guidance of theoretical model, precise deposition of micro/nano fibers could only accomplished by experience. To analyze the behavior of charged jet in NFES using mathematical model, the momentum balance equation was simplified and a new expression between jet cross-sectional radius and axial position was derived. Using this new expression and mass conservation equation, expressions for jet cross-sectional radius and velocity were derived in terms of axial position and initial jet acceleration in the form of exponential functions. Based on Slender-body theory and Giesekus model, a quadratic equation for initial jet acceleration was acquired. With the proposed model, it was able to accurately predict the diameter and velocity of polymer fibers in NFES, and mathematical analysis rather than experimental methods could be applied to study the effects of the process parameters in NFES. Moreover, the movement velocity of the collector stage can be regulated by mathematical model rather than experience. Therefore, the model proposed in this paper had important guiding significance to precise deposition of polymer fibers.

  6. NREL: Dynamic Maps, GIS Data, and Analysis Tools - Geothermal Prospector

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Geothermal Prospector Start exploring U.S. geothermal resources with an easy-to-use map by selecting data layers that are NGDS compatible. Bookmark and Share Geothermal Prospector The Geothermal Prospector mapping tool provides an excellent data resource for visual exploration of geothermal resources using the tools and datasets required to produce and disseminate both exploration gap analysis and Enhanced Geothermal System (EGS) planning and analysis. In 2010, NREL developed Geothermal

  7. Near-field modeling in Frenchman Flat, Nevada Test Site

    SciTech Connect (OSTI)

    Pohlmann, K.; Shirley, C.; Andricevic, R.

    1996-12-01

    The US Department of Energy (DOE) is investigating the effects of nuclear testing in underground test areas (the UGTA program) at the Nevada Test Site. The principal focus of the UGTA program is to better understand and define subsurface radionuclide migration. The study described in this report focuses on the development of tools for generating maps of hydrogeologic characteristics of subsurface Tertiary volcanic units at the Frenchman Flat corrective Action Unit (CAU). The process includes three steps. The first step involves generation of three-dimensional maps of the geologic structure of subsurface volcanic units using geophysical logs to distinguish between two classes: densely welded tuff and nonwelded tuff. The second step generates three-dimensional maps of hydraulic conductivity utilizing the spatial distribution of the two geologic classes obtained in the first step. Each class is described by a correlation structure based on existing data on hydraulic conductivity, and conditioned on the generated spatial location of each class. The final step demonstrates the use of the maps of hydraulic conductivity for modeling groundwater flow and radionuclide transport in volcanic tuffs from an underground nuclear test at the Frenchman Flat CAU. The results indicate that the majority of groundwater flow through the volcanic section occurs through zones of densely welded tuff where connected fractures provide the transport pathway. Migration rates range between near zero to approximately four m/yr, with a mean rate of 0.68 m/yr. This report presents the results of work under the FY96 Near-Field Modeling task of the UGTA program.

  8. Enhanced Geothermal System Potential for Sites on the Eastern Snake River Plain, Idaho

    SciTech Connect (OSTI)

    Robert K Podgorney; Thomas R. Wood; Travis L McLing; Gregory Mines; Mitchell A Plummer; Michael McCurry; Ahmad Ghassemi; John Welhan; Joseph Moore; Jerry Fairley; Rachel Wood

    2013-09-01

    The Snake River volcanic province overlies a thermal anomaly that extends deep into the mantle and represents one of the highest heat flow provinces in North America (Blackwell and Richards, 2004). This makes the Snake River Plain (SRP) one of the most under-developed and potentially highest producing geothermal districts in the United States. Elevated heat flow is typically highest along the margins of the topographic SRP and lowest along the axis of the plain, where thermal gradients are suppressed by the Snake River aquifer. Beneath this aquifer, however, thermal gradients rise again and may tap even higher heat flows associated with the intrusion of mafic magmas into the mid-crustal sill complex (e.g., Blackwell, 1989).

  9. Key Activities of the Geothermal Technologies Office | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    About the Geothermal Technologies Office » Key Activities of the Geothermal Technologies Office Key Activities of the Geothermal Technologies Office Key activities for the Geothermal Technologies Office (GTO) include research, development and demonstration; system validation; technology validation; strategic planning, analysis, and R&D integration. Specific activities are summarized below. Program Area Activities Enhanced Geothermal Systems (EGS) GTO conducts research, development and

  10. Geothermal Literature Review At International Geothermal Area...

    Open Energy Info (EERE)

    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At International Geothermal Area, Iceland (Ranalli & Rybach, 2005)...

  11. Geothermal Literature Review At International Geothermal Area...

    Open Energy Info (EERE)

    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At International Geothermal Area, New Zealand (Ranalli & Rybach, 2005)...

  12. Geothermal Literature Review At International Geothermal Area...

    Open Energy Info (EERE)

    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At International Geothermal Area, Italy (Ranalli & Rybach, 2005) Exploration...

  13. Geothermal Energy Association Recognizes the National Geothermal...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Geothermal Energy Association Recognizes the National Geothermal Data System Geothermal Energy Association Recognizes the National Geothermal Data System July 29, 2014 - 8:20am...

  14. Water Use in Enhanced Geothermal Systems (EGS): Geology of U.S. Stimulation Projects, Water Costs, and Alternative Water Use Policies

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Schroeder, Jenna N.

    2014-12-16

    According to the Energy Information Administration (EIA) of the U.S. Department of Energy (DOE), geothermal energy generation in the United States is projected to more than triple by 2040 (EIA 2013). This addition, which translates to more than 5 GW of generation capacity, is anticipated because of technological advances and an increase in available sources through the continued development of enhanced geothermal systems (EGSs) and low-temperature resources (EIA 2013). Studies have shown that air emissions, water consumption, and land use for geothermal electricity generation have less of an impact than traditional fossil fuel?based electricity generation; however, the long-term sustainability of geothermal power plants can be affected by insufficient replacement of aboveground or belowground operational fluid losses resulting from normal operations (Schroeder et al. 2014). Thus, access to water is therefore critical for increased deployment of EGS technologies and, therefore, growth of the geothermal sector. This paper examines water issues relating to EGS development from a variety of perspectives. It starts by exploring the relationship between EGS site geology, stimulation protocols, and below ground water loss, which is one of the largest drivers of water consumption for EGS projects. It then examines the relative costs of different potential traditional and alternative water sources for EGS. Finally it summarizes specific state policies relevant to the use of alternative water sources for EGS, and finally explores the relationship between EGS site geology, stimulation protocols, and below ground water loss, which is one of the largest drivers of water consumption for EGS projects.

  15. Water Use in Enhanced Geothermal Systems (EGS): Geology of U.S. Stimulation Projects, Water Costs, and Alternative Water Use Policies

    DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

    Schroeder, Jenna N.

    According to the Energy Information Administration (EIA) of the U.S. Department of Energy (DOE), geothermal energy generation in the United States is projected to more than triple by 2040 (EIA 2013). This addition, which translates to more than 5 GW of generation capacity, is anticipated because of technological advances and an increase in available sources through the continued development of enhanced geothermal systems (EGSs) and low-temperature resources (EIA 2013). Studies have shown that air emissions, water consumption, and land use for geothermal electricity generation have less of an impact than traditional fossil fuel?based electricity generation; however, the long-term sustainability of geothermal power plants can be affected by insufficient replacement of aboveground or belowground operational fluid losses resulting from normal operations (Schroeder et al. 2014). Thus, access to water is therefore critical for increased deployment of EGS technologies and, therefore, growth of the geothermal sector. This paper examines water issues relating to EGS development from a variety of perspectives. It starts by exploring the relationship between EGS site geology, stimulation protocols, and below ground water loss, which is one of the largest drivers of water consumption for EGS projects. It then examines the relative costs of different potential traditional and alternative water sources for EGS. Finally it summarizes specific state policies relevant to the use of alternative water sources for EGS, and finally explores the relationship between EGS site geology, stimulation protocols, and below ground water loss, which is one of the largest drivers of water consumption for EGS projects.

  16. Three-dimensional Modeling of Fracture Clusters in Geothermal Reservoirs;

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    2010 Geothermal Technology Program Peer Review Report | Department of Energy Reservoirs; 2010 Geothermal Technology Program Peer Review Report Three-dimensional Modeling of Fracture Clusters in Geothermal Reservoirs; 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal Technologies Program Peer Review reservoir_028_ghassmi.pdf (203.27 KB) More Documents & Publications Tracer Methods for Characterizing Fracture Stimulation in Enhanced Geothermal Systems (EGS); 2010

  17. High Temperature, High Pressure Devices for Zonal Isolation in Geothermal

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Wells | Department of Energy High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells fabian_ctd_ zonal_isolation_peer2013.pdf (809.57 KB) More Documents & Publications High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells track 3: enhanced geothermal systems (EGS) | geothermal 2015

  18. Energy 101: Geothermal Energy | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Geothermal Energy Energy 101: Geothermal Energy

  19. Geothermal Tomorrow

    Office of Energy Efficiency and Renewable Energy (EERE)

    This magazine-format report discusses recent strategies and activities of the DOE Geothermal Technologies Program, as well as an update of technologies and economics of the U.S. geothermal industry.

  20. Geothermal guidebook

    SciTech Connect (OSTI)

    Not Available

    1981-06-01

    The guidebook contains an overview, a description of the geothermal resource, statutes and regulations, and legislative policy concerns. (MHR)

  1. Purchase and Installation of a Geothermal Power Plant to Generate Electricity Using Geothermal Water Resources

    Broader source: Energy.gov [DOE]

    Project objectives: Demonstrate technical and financial feasibility of the use of an existing low-temperature geothermal resource for combined heat and power; and Maintain and enhance existing geothermal district heating operation.

  2. Range-gated imaging for near-field target identification

    SciTech Connect (OSTI)

    Yates, G.J.; Gallegos, R.A.; McDonald, T.E.

    1996-12-01

    The combination of two complementary technologies developed independently at Los Alamos National Laboratory (LANL) and Sandia National Laboratory (SNL) has demonstrated feasibility of target detection and image capture in a highly light-scattering, medium. The technique uses a compact SNL developed Photoconductive Semiconductor Switch/Laser Diode Array (PCSS/LDA) for short-range (distances of 8 to 10 m) large Field-Of-View (FOV) target illumination. Generation of a time-correlated echo signal is accomplished using a photodiode. The return image signal is recorded with a high-speed shuttered Micro-Channel-Plate Image Intensifier (MCPII), declined by LANL and manufactured by Philips Photonics. The MCPII is rated using a high-frequency impedance-matching microstrip design to produce 150 to 200 ps duration optical exposures. The ultra first shuttering producer depth resolution of a few inches along the optic axis between the MCPII and the target, producing enhanced target images effectively deconvolved from noise components from the scattering medium in the FOV. The images from the MCPII are recorded with an RS-170 Charge-Coupled-Device camera and a Big Sky, Beam Code, PC-based digitizer frame grabber and analysis package. Laser pulse data were obtained by the but jitter problems and spectral mismatches between diode spectral emission wavelength and MCPII photocathode spectral sensitivity prevented the capture of fast gating imaging with this demonstration system. Continued development of the system is underway.

  3. Idaho Geothermal Commercialization Program. Idaho geothermal handbook

    SciTech Connect (OSTI)

    Hammer, G.D.; Esposito, L.; Montgomery, M.

    1980-03-01

    The following topics are covered: geothermal resources in Idaho, market assessment, community needs assessment, geothermal leasing procedures for private lands, Idaho state geothermal leasing procedures - state lands, federal geothermal leasing procedures - federal lands, environmental and regulatory processes, local government regulations, geothermal exploration, geothermal drilling, government funding, private funding, state and federal government assistance programs, and geothermal legislation. (MHR)

  4. development Not Available 15 GEOTHERMAL ENERGY; TONGONAN GEOTHERMAL...

    Office of Scientific and Technical Information (OSTI)

    field Leyte, Philippines. Report on exploration and development Not Available 15 GEOTHERMAL ENERGY; TONGONAN GEOTHERMAL FIELD; GEOTHERMAL EXPLORATION; GEOTHERMAL POWER...

  5. The Future of Geothermal Energy

    SciTech Connect (OSTI)

    Kubik, Michelle

    2006-01-01

    A comprehensive assessment of enhanced, or engineered, geothermal systems was carried out by an 18-member panel assembled by the Massachusetts Institute of Technology (MIT) to evaluate the potential of geothermal energy becoming a major energy source for the United States.

  6. Geothermal Energy | Open Energy Information

    Open Energy Info (EERE)

    Geothermal Energy (Redirected from Geothermal) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Overview Technologies Resources Market Data Geothermal Topics Data...

  7. Development of a Plan to Implement Enhanced Geothermal Systems (EGS) in the Animas Valley, New Mexico - Final Report - 07/26/2000 - 02/01/2001

    SciTech Connect (OSTI)

    Schochet, Daniel N.; Cunniff, Roy A.

    2001-02-01

    The concept of producing energy from hot dry rock (HDR), originally proposed in 1971 at the Los Alamos National Laboratory, contemplated the generation of electric power by injecting water into artificially created fractures in subsurface rock formations with high heat flow. Recognizing the inherent difficulties associated with HDR, the concept of Enhanced Geothermal Systems was proposed. This embraces the idea that the amount of permeability and fluid in geothermal resources varies across a spectrum, with HDR at one end, and conventional hydrothermal systems at the other. This report provides a concept for development of a ''Combined Technologies Project'' with construction and operation of a 6 MW (net) binary-cycle geothermal power plant that uses both the intermediate-depth hydrothermal system at 1,200 to 3,300 feet and a deeper EGS capable system at 3,000 to 4,000 feet. Two production/injection well pairs will be drilled, one couplet for the hydrothermal system, and one for the E GS system. High-pressure injection may be required to drive fluid through the EGS reservoir from the injection to the production well.

  8. Microsoft Word - 338M_Geothermal_Project_Descriptions

    Energy Savers [EERE]

    ...Analysis United Technologies Research Center ... plants in an enhanced turbine geothermal binary system. ... zones and building types. Florida International University ...

  9. Photoconductive terahertz near-field detector with a hybrid nanoantenna array cavity

    SciTech Connect (OSTI)

    Mitrofanov, Oleg; Brener, Igal; Luk, Ting S.; Reno, John L.

    2015-11-19

    Nanoscale structuring of optical materials leads to modification of their properties and can be used for improving efficiencies of photonic devices and for enabling new functionalities. In ultrafast optoelectronic switches for generation and detection of terahertz (THz) radiation, incorporation of nanostructures allows us to overcome inherent limitations of photoconductive materials. We propose and demonstrate a nanostructured photoconductive THz detector for sampling highly localized THz fields, down to the level of λ/150. The nanostructure that consists of an array of optical nanoantennas and a distributed Bragg reflector forms a hybrid cavity, which traps optical gate pulses within the photoconductive layer. The effect of photon trapping is observed as enhanced absorption at a designed wavelength. This optically thin photoconductive THz detector allows us to detect highly confined evanescent THz fields coupled through a deeply subwavelength aperture as small as 2 μm (λ/150 at 1 THz). As a result, by monolithically integrating the THz detector with apertures ranging from 2 to 5 μm we realize higher spatial resolution and higher sensitivity in aperture-type THz near-field microscopy and THz time-domain spectroscopy.

  10. Photoconductive terahertz near-field detector with a hybrid nanoantenna array cavity

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Mitrofanov, Oleg; Brener, Igal; Luk, Ting S.; Reno, John L.

    2015-11-19

    Nanoscale structuring of optical materials leads to modification of their properties and can be used for improving efficiencies of photonic devices and for enabling new functionalities. In ultrafast optoelectronic switches for generation and detection of terahertz (THz) radiation, incorporation of nanostructures allows us to overcome inherent limitations of photoconductive materials. We propose and demonstrate a nanostructured photoconductive THz detector for sampling highly localized THz fields, down to the level of λ/150. The nanostructure that consists of an array of optical nanoantennas and a distributed Bragg reflector forms a hybrid cavity, which traps optical gate pulses within the photoconductive layer. Themore » effect of photon trapping is observed as enhanced absorption at a designed wavelength. This optically thin photoconductive THz detector allows us to detect highly confined evanescent THz fields coupled through a deeply subwavelength aperture as small as 2 μm (λ/150 at 1 THz). As a result, by monolithically integrating the THz detector with apertures ranging from 2 to 5 μm we realize higher spatial resolution and higher sensitivity in aperture-type THz near-field microscopy and THz time-domain spectroscopy.« less

  11. Appendix F - GPRA06 geothermal technologies program documentation

    SciTech Connect (OSTI)

    None, None

    2009-01-18

    The primary goal of the Geothermal Technologies Program is to reduce the cost of geothermal generation technologies, including both conventional and enhanced geothermal systems (EGS). EGS are defined as geothermal systems where the reservoir requires substantial engineering manipulation to make using the reservoir economically feasible.

  12. THz near-field microscopy of graphene nano-ribbon arrays. (Conference...

    Office of Scientific and Technical Information (OSTI)

    Title: THz near-field microscopy of graphene nano-ribbon arrays. Authors: Pan, Wei ; Brener, Igal ; Mitrofanov, O. ; Thompson, R ; Yu, W. ; berger, c ; de heer, w.a. ; Jiang, Z. ...

  13. Terahertz near-field imaging of surface plasmon waves in graphene structures

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Mitrofanov, O.; Yu, W.; Thompson, R. J.; Jiang, Y.; Greenberg, Z. J.; Palmer, J.; Brener, I.; Pan, W.; Berger, C.; de Heer, W. A.; et al

    2015-09-08

    In this study, we introduce a near-field scanning probe terahertz (THz) microscopy technique for probing surface plasmon waves on graphene. Based on THz time-domain spectroscopy method, this near-field imaging approach is well suited for studying the excitation and evolution of THz plasmon waves on graphene as well as for mapping of graphene properties at THz frequencies on the sub-wavelength scale.

  14. Geothermal Reservoir Dynamics - TOUGHREACT

    SciTech Connect (OSTI)

    Pruess, Karsten; Xu, Tianfu; Shan, Chao; Zhang, Yingqi; Wu,Yu-Shu; Sonnenthal, Eric; Spycher, Nicolas; Rutqvist, Jonny; Zhang,Guoxiang; Kennedy, Mack

    2005-03-15

    This project has been active for several years and has focused on developing, enhancing and applying mathematical modeling capabilities for fractured geothermal systems. The emphasis of our work has recently shifted towards enhanced geothermal systems (EGS) and hot dry rock (HDR), and FY05 is the first year that the DOE-AOP actually lists this project under Enhanced Geothermal Systems. Our overall purpose is to develop new engineering tools and a better understanding of the coupling between fluid flow, heat transfer, chemical reactions, and rock-mechanical deformation, to demonstrate new EGS technology through field applications, and to make technical information and computer programs available for field applications. The objectives of this project are to: (1) Improve fundamental understanding and engineering methods for geothermal systems, primarily focusing on EGS and HDR systems and on critical issues in geothermal systems that are difficult to produce. (2) Improve techniques for characterizing reservoir conditions and processes through new modeling and monitoring techniques based on ''active'' tracers and coupled processes. (3) Improve techniques for targeting injection towards specific engineering objectives, including maintaining and controlling injectivity, controlling non-condensable and corrosive gases, avoiding scale formation, and optimizing energy recovery. Seek opportunities for field testing and applying new technologies, and work with industrial partners and other research organizations.

  15. Geothermal Energy News | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    University under the direction of Dr. Roland Horne is advancing the application of nanotechnology in determining fluid flow through enhanced geothermal system reservoirs at depth....

  16. Stanford Geothermal Workshop- Geothermal Technologies Office

    Broader source: Energy.gov [DOE]

    Presentation by Geothermal Technologies Director Doug Hollett at the Stanford Geothermal Workshop on February 11-13, 2013.

  17. Geothermal Energy | Open Energy Information

    Open Energy Info (EERE)

    Energy (Redirected from Geothermal Power) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Geothermal Energy RSF GeothermalPowerStation.jpg Geothermal energy...

  18. Geothermal Basics

    Broader source: Energy.gov [DOE]

    Geothermal energy is thermal energy generated and stored in the Earth. Geothermal energy can manifest on the surface of the Earth, or near the surface of the Earth, where humankind may harness it to serve our energy needs. Geothermal resources are reservoirs of hot water that exist at varying temperatures and depths below the Earth's surface. Wells can be drilled into these underground reservoirs to tap steam and very hot water that can be brought to the surface for a variety of uses.

  19. Geothermal hydrothermal

    SciTech Connect (OSTI)

    None, None

    2009-01-18

    The geothermal hydrothermal section of the Renewable Energy Technology Characterizations describes the technical and economic status of this emerging renewable energy option for electricity supply.

  20. Concept Testing and Development at the Raft River Geothermal Field, Idaho |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy DOE 2010 Geothermal Technologies Program Peer Review egs_007_moore.pdf (181.39 KB) More Documents & Publications Demonstration of an Enhanced Geothermal System at the Northwest Geysers Geothermal Field, California; 2010 Geothermal Technology Program Peer Review Report Feasibility of EGS Development at Bradys Hot Springs, Nevada Creation of an Enhanced Geothermal System through Hydraulic and Thermal Stimulation; 2010 Geothermal Technology Program Peer Review Repo

  1. Validation of Geothermal Tracer Methods in Highly Constrained Field

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Experiments | Department of Energy Geothermal Tracer Methods in Highly Constrained Field Experiments Validation of Geothermal Tracer Methods in Highly Constrained Field Experiments DOE Geothermal Peer Review 2010 - Project Summary. This project will test smartdiffusive tracers for measuring heat exchange. tracers_becker_verification_methods.pdf (1.81 MB) More Documents & Publications track 3: enhanced geothermal systems (EGS) | geothermal 2015 peer review Advancing reactive tracer

  2. The Future of Geothermal Energy | Department of Energy

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    The Future of Geothermal Energy The Future of Geothermal Energy The Future of Geothermal Energy report is an evaluation of geothermal energy as a major supplier of energy in the United States. An 18-member assessment panel with broad experience and expertise was formed to conduct the study beginning in September 2005. The work evaluated three major areas of Enhanced Geothermal Systems (EGS): Magnitude and distribution of the EGS resource Status and remaining requirements of EGS technology needed

  3. Desert Peak East EGS Project; 2010 Geothermal Technology Program Peer

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Review Report | Department of Energy East EGS Project; 2010 Geothermal Technology Program Peer Review Report Desert Peak East EGS Project; 2010 Geothermal Technology Program Peer Review Report DOE 2010 Geothermal Technologies Program Peer Review egs_008_zemach.pdf (182.67 KB) More Documents & Publications Feasibility of EGS Development at Bradys Hot Springs, Nevada Concept Testing and Development at the Raft River Geothermal Field, Idaho Creation of an Enhanced Geothermal System

  4. DOE-Backed Project Will Demonstrate Innovative Geothermal Technology |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy DOE-Backed Project Will Demonstrate Innovative Geothermal Technology DOE-Backed Project Will Demonstrate Innovative Geothermal Technology June 16, 2010 - 2:27pm Addthis As part of DOE's Geothermal Technologies Program, two geothermal companies, AltaRock Energy and Davenport Newberry, announced plans on June 8 to conduct a demonstration of Enhanced Geothermal Systems (EGS) technology at a site located near Bend, Oregon. The purpose of this project is to extract energy

  5. Noise analysis for near field 3-D FM-CW radar imaging systems

    SciTech Connect (OSTI)

    Sheen, David M.

    2015-06-19

    Near field radar imaging systems are used for several applications including concealed weapon detection in airports and other high-security venues. Despite the near-field operation, phase noise and thermal noise can limit the performance in several ways including reduction in system sensitivity and reduction of image dynamic range. In this paper, the effects of thermal noise, phase noise, and processing gain are analyzed in the context of a near field 3-D FM-CW imaging radar as might be used for concealed weapon detection. In addition to traditional frequency domain analysis, a time-domain simulation is employed to graphically demonstrate the effect of these noise sources on a fast-chirping FM-CW system.

  6. Electromagnetic Simulation of the Near-Field Distribution around a Wind Farm

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Yang, Shang-Te; Ling, Hao

    2013-01-01

    An efficienmore » t approach to compute the near-field distribution around and within a wind farm under plane wave excitation is proposed. To make the problem computationally tractable, several simplifying assumptions are made based on the geometry problem. By comparing the approximations against full-wave simulations at 500 MHz, it is shown that the assumptions do not introduce significant errors into the resulting near-field distribution. The near fields around a 3 × 3 wind farm are computed using the developed methodology at 150 MHz, 500 MHz, and 3 GHz. Both the multipath interference patterns and the forward shadows are predicted by the proposed method.« less

  7. Near-Field Spectroscopy and Imaging of Subwavelength Plasmonic Terahertz Resonators

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Mitrofanov, Oleg; Khromova, Irina; Siday, Thomas; Thompson, Robert J.; Ponomarev, Andrey N.; Brener, Igal; Reno, John L.

    2016-04-22

    We describe the temporal evolution of the terahertz (THz) field leading to the excitation of plasmonic resonances in carbon microfibers. The field evolution is mapped in space and time for the 3/2 wavelength resonance using a subwavelength aperture THz near-field probe with an embedded THz photoconductive detector. The excitation of surface waves at the fiber tips leads to the formation of a standing wave along the fiber. Local THz time-domain spectroscopy at one of the standing wave crests shows a clear third-order resonance peak at 1.65 THz, well described by the Lorentz model. Lastly, this application of the subwavelength aperturemore » THz near-field microscopy for mode mapping and local spectroscopy demonstrates the potential of near-field methods for studies of subwavelength plasmonic THz resonators.« less

  8. Geothermal Energy

    SciTech Connect (OSTI)

    Steele, B.C.; Pichiarella, L.S.; Kane, L.S.; Henline, D.M.

    1995-01-01

    Geothermal Energy (GET) announces on a bimonthly basis the current worldwide information available on the technologies required for economic recovery of geothermal energy and its use as direct heat or for electric power production. This publication contains the abstracts of DOE reports, journal articles, conference papers, patents, theses, and monographs added to the Energy Science and Technology Database during the past two months.

  9. SMU Geothermal Conference 2011 - Geothermal Technologies Program |

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Department of Energy SMU Geothermal Conference 2011 - Geothermal Technologies Program SMU Geothermal Conference 2011 - Geothermal Technologies Program DOE Geothermal Technologies Program presentation at the SMU Geothermal Conference in June 2011. gtp_smu_conference_reinhardt_2011.pdf (1.4 MB) More Documents & Publications Low Temperature/Coproduced/Geopressured Subprogram Overview AAPG Low-Temperature Webinar Geothermal Technologies Program Peer Review Program June 6 - 10, 2011

  10. Graphene-assisted near-field radiative heat transfer between corrugated polar materials

    SciTech Connect (OSTI)

    Liu, X. L.; Zhang, Z. M.

    2014-06-23

    Graphene has attracted great attention in nanoelectronics, optics, and energy harvesting. Here, the near-field radiative heat transfer between graphene-covered corrugated silica is investigated based on the exact scattering theory. It is found that graphene can improve the radiative heat flux between silica gratings by more than one order of magnitude and alleviate the performance sensitivity to lateral shift. The underlying mechanism is mainly attributed to the improved photon tunneling of modes away from phonon resonances. Besides, coating with graphene leads to nonlocal radiative transfer that breaks Derjaguin's proximity approximation and enables corrugated silica to outperform bulk silica in near-field radiation.

  11. Near field and altered zone environmental report Volume I: technical bases for EBS design

    SciTech Connect (OSTI)

    Wilder, D. G., LLNL

    1997-08-01

    This report presents an updated summary of results for the waste package (WP) and engineered barrier system (EBS) evaluations, including materials testing, waste-form characterization, EBS performance assessments, and near-field environment (NFE) characterization. Materials testing, design criteria and concept development, and waste-form characterization all require an understanding of the environmental conditions that will interact with the WP and EBS. The Near-Field Environment Report (NFER) was identified in the Waste Package Plan (WPP) (Harrison- Giesler, 1991) as the formal means for transmitting and documenting this information.

  12. Geothermal Energy News

    Broader source: Energy.gov (indexed) [DOE]

    geothermal900546 Geothermal Energy News en EERE Announces Up to 4 Million for Critical Materials Recovery from Geothermal Fluids http:energy.goveerearticles...

  13. About / FAQ | Geothermal

    Office of Scientific and Technical Information (OSTI)

    About About Geothermal The Geothermal Technologies Legacy Collection is available to the geothermal community and interested members of the public who may use this site and its ...

  14. Site Map | Geothermal

    Office of Scientific and Technical Information (OSTI)

    Site Map Site Map Home Basic Search Advanced Search Geothermal FAQ About Geothermal Site Map Geothermal Feedback Website PoliciesImportant Links

  15. Final Technical Report - 300???°C Capable Electronics Platform and Temperature Sensor System For Enhanced Geothermal Systems

    SciTech Connect (OSTI)

    Cheng-Po Chen; David Shaddock; Peter Sandvik; Rich Saia; Amita Patil, Alexey Vert; Tan Zhang

    2012-11-30

    A silicon carbide (SiC) based electronic temperature sensor prototype has been demonstrated to operate at 300???°C. We showed continuous operation of 1,000 hours with SiC operational amplifier and surface mounted discreet resistors and capacitors on a ceramic circuit board. This feasibility demonstration is a major milestone in the development of high temperature electronics in general and high temperature geothermal exploration and well management tools in particular. SiC technology offers technical advantages that are not found in competing technologies such as silicon-on-insulator (SOI) at high temperatures of 200???°C to 300???°C and beyond. The SiC integrated circuits and packaging methods can be used in new product introduction by GE Oil and Gas for high temperature down-hole tools. The existing SiC fabrication facility at GE is sufficient to support the quantities currently demanded by the marketplace, and there are other entities in the United States and other countries capable of ramping up SiC technology manufacturing. The ceramic circuit boards are different from traditional organic-based electronics circuit boards, but the fabrication process is compatible with existing ceramic substrate manufacturing. This project has brought high temperature electronics forward, and brings us closer to commercializing tools that will enable and reduce the cost of enhanced geothermal technology to benefit the public in terms of providing clean renewable energy at lower costs.

  16. DOE 2009 Geothermal Risk Analysis: Methodology and Results (Presentation)

    SciTech Connect (OSTI)

    Young, K. R.; Augustine, C.; Anderson, A.

    2010-02-01

    This presentation summarizes the methodology and results for a probabilistic risk analysis of research, development, and demonstration work-primarily for enhanced geothermal systems (EGS)-sponsored by the U.S. Department of Energy Geothermal Technologies Program.

  17. Tracer Methods for Characterizing Fracture Stimulation in Enhanced...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Stimulation in Enhanced Geothermal Systems (EGS); 2010 Geothermal Technology Program Peer Review Report Tracer Methods for Characterizing Fracture Stimulation in Enhanced...

  18. Protocol for Addressing Induced Seismicity Associated with Enhanced...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems (EGS) Protocol for Addressing Induced Seismicity Associated with Enhanced Geothermal Systems...

  19. Heat Transfer and Fluid Transport of Supercritical CO2 in Enhanced Geothermal System with Local Thermal Non-equilibrium Model

    SciTech Connect (OSTI)

    Zhang, Le; Luo, Feng; Xu, Ruina; Jiang, Peixue; Liu, Huihai

    2014-12-31

    The heat transfer and fluid transport of supercritical CO2 in enhanced geothermal system (EGS) is studied numerically with local thermal non-equilibrium model, which accounts for the temperature difference between solid matrix and fluid components in porous media and uses two energy equations to describe heat transfer in the solid matrix and in the fluid, respectively. As compared with the previous results of our research group, the effect of local thermal non-equilibrium mainly depends on the volumetric heat transfer coefficient ah, which has a significant effect on the production temperature at reservoir outlet and thermal breakthrough time. The uniformity of volumetric heat transfer coefficient ah has little influence on the thermal breakthrough time, but the temperature difference become more obvious with time after thermal breakthrough with this simulation model. The thermal breakthrough time reduces and the effect of local thermal non-equilibrium becomes significant with decreasing ah.

  20. NREL: Geothermal Technologies - News

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Geothermal News Below are news stories involving geothermal research. May 16, 2016 NREL Helping the Bureau of Land Management Dive Further into Hot Water Geothermal program boosted by greater access to data. March 10, 2016 NREL's Geothermal Experts Present at the 41st Annual Stanford Geothermal Workshop NREL geothermal experts attend the 41st Annual Stanford Geothermal Workshop--one of the world's longest-running technical meetings on the topic of geothermal energy. March 2, 2016 U.S. Bureau of

  1. National Geothermal Summit

    Broader source: Energy.gov [DOE]

    The Geothermal Energy Association hosts its annual National Geothermal Summit in Reno, Nevada, June 3-4, 2015.

  2. Geothermal Literature Review At Long Valley Caldera Geothermal...

    Open Energy Info (EERE)

    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Long Valley Caldera Geothermal Area (Goldstein & Flexser, 1984)...

  3. Geothermal Literature Review At Lightning Dock Geothermal Area...

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    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Lightning Dock Geothermal Area (Witcher, 2008) Exploration Activity...

  4. Geothermal Literature Review At Lightning Dock Geothermal Area...

    Open Energy Info (EERE)

    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Lightning Dock Geothermal Area (Spiegel, 1957) Exploration Activity...

  5. Geothermal Literature Review At Roosevelt Hot Springs Geothermal...

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    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Roosevelt Hot Springs Geothermal Area (Faulder, 1991) Exploration Activity...

  6. Geothermal Literature Review At Coso Geothermal Area (1985) ...

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    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Coso Geothermal Area (1985) Exploration Activity Details Location Coso...

  7. Geothermal Literature Review At Lightning Dock Geothermal Area...

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    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Lightning Dock Geothermal Area (Farhar, 2002) Exploration Activity Details...

  8. Geothermal Literature Review At Geysers Geothermal Area (1984...

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    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Geysers Geothermal Area (1984) Exploration Activity Details Location...

  9. Geothermal Literature Review At Lightning Dock Geothermal Area...

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    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Lightning Dock Geothermal Area (Fleischman, 2006) Exploration Activity...

  10. Geothermal Literature Review At Lightning Dock Geothermal Area...

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    navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Lightning Dock Geothermal Area (Grant, 1978) Exploration Activity Details...