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Title: Systems and methods for multi-fluid geothermal energy systems

Abstract

A method for extracting geothermal energy from a geothermal reservoir formation. A production well is used to extract brine from the reservoir formation. At least one of nitrogen (N.sub.2) and carbon dioxide (CO.sub.2) may be used to form a supplemental working fluid which may be injected into a supplemental working fluid injection well. The supplemental working fluid may be used to augment a pressure of the reservoir formation, to thus drive a flow of the brine out from the reservoir formation.

Inventors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1393516
Patent Number(s):
9,765,604
Application Number:
14/167,375
Assignee:
Lawrence Livemore National Security, LLC LLNL
DOE Contract Number:
AC52-07NA27344
Resource Type:
Patent
Resource Relation:
Patent File Date: 2014 Jan 29
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY

Citation Formats

Buscheck, Thomas A. Systems and methods for multi-fluid geothermal energy systems. United States: N. p., 2017. Web.
Buscheck, Thomas A. Systems and methods for multi-fluid geothermal energy systems. United States.
Buscheck, Thomas A. 2017. "Systems and methods for multi-fluid geothermal energy systems". United States. doi:. https://www.osti.gov/servlets/purl/1393516.
@article{osti_1393516,
title = {Systems and methods for multi-fluid geothermal energy systems},
author = {Buscheck, Thomas A.},
abstractNote = {A method for extracting geothermal energy from a geothermal reservoir formation. A production well is used to extract brine from the reservoir formation. At least one of nitrogen (N.sub.2) and carbon dioxide (CO.sub.2) may be used to form a supplemental working fluid which may be injected into a supplemental working fluid injection well. The supplemental working fluid may be used to augment a pressure of the reservoir formation, to thus drive a flow of the brine out from the reservoir formation.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 9
}

Patent:

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  • A geo-energy production method for extracting thermal energy from a reservoir formation. A production well extracts brine from the reservoir formation. A plurality of working fluid injection ("WFI") wells may be arranged proximate to the production well to at least partially circumscribe the production well. A plurality of brine production ("BP") wells may be arranged in a vicinity of the WFI wells to at least partially circumscribe the WFI wells. A working fluid is injected into the WFI wells to help drive a flow of the brine up through the production and BP wells, together with at least a portionmore » of the injected working fluid. Parasitic-load time-shifting and to storing of excess solar thermal energy may also be performed.« less
  • Downhole fluid injection systems are provided that can include a first well extending into a geological formation, and a fluid injector assembly located within the well. The fluid injector assembly can be configured to inject a liquid CO 2/H 2O-emulsion into the surrounding geological formation. CO 2 sequestration methods are provided that can include exposing a geological formation to a liquid CO 2/H 2O-emulsion to sequester at least a portion of the CO 2 from the emulsion within the formation. Hydrocarbon material recovery methods are provided that can include exposing a liquid CO 2/H 2O-emulsion to a geological formation havingmore » the hydrocarbon material therein. The methods can include recovering at least a portion of the hydrocarbon material from the formation.« less
  • A method for resisting corrosion while conducting a flow of hot, corrosive geothermal fluid is described comprising the steps of: (a) forming a fluid conducting element of a beta and alpha titanium-base product produced by heating to form a metastable beta titantium matrix, and thereafter heat treating the matrix to form sufficient alpha phase therein providing an increase in ultimate tensile strength of at least about 10,000 psi over that of the matrix before the heat treating, the beta and alpha titantium-base product so formed having an average valence electron density of between about 4.15 and about 4.35. The compositionmore » consisting essentially of: (i) a total of between about 2 and about 10 weight percent of one or more beta eutectoid elements; (ii) between about 4 and about 10 weight percent of vanadium; (iii) between about 3 and about 6 weight percent of molybdenum; (iv) between about 2 and about 5 weight percent of aluminum; and (v) the balance titanium; and (b) following the geothermal fluid through the fluid conducting element.« less
  • A process and system for recovery of energy from geothermal brines and other water-containing or hot water sources are described. Direct contact heat exchange is effected between the brine or hot water, and a working fluid, e.g., n-butane, in a heat transfer column. The heat transfer column is operated in the subcritical pressure region of the working fluid, close to or approaching the apex of the saturated vapor curve for such a working fluid on the Mollier enthalpy-entropy diagram for such a fluid. The heated working fluid exiting the top of the heat transfer column is expanded through an expandermore » to produce work. The discharge from the expander is cooled to condense working fluid which is separated in an accumulator, from condensed water vapor present in the working fluid, and the condensed working fluid is pressurized and fed back to the heat transfer column. Cooled brine or water from the bottom of the heat transfer column and water from the accumulator are fed to a flashing device such as a flash drum operated at a pressure less than that in the accumulator. The working fluid flashed off is compressed and returned to the cooler at the expander discharge, for condensation and recovery. Uncondensible gases plus working fluid losses are vented from the accumulator. Cold brine or water is discharged from the flashing means such as the flash drum, and any scale formed in the heat transfer column is discharged from the bottom thereof.« less