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Title: Optimization of Well Configuration for a Sedimentary Enhanced Geothermal Reservoir

Abstract

The extraction of geothermal energy in the form of hot water from sedimentary rock formations could expand the current geothermal energy resources toward new regions. From previous work, we observed that sedimentary geothermal reservoirs with relatively low permeability would require the application of enhancement techniques (e.g., well hydraulic stimulation) to achieve commercial production/injection rates. In this paper we extend our previous work to develop a methodology to determine the optimum well configuration that maximizes the hydraulic performance of the geothermal system. The geothermal systems considered consist of one vertical well doublet system with hydraulic fractures, and three horizontal well configurations with open-hole completion, longitudinal fractures and transverse fractures, respectively. A commercial thermal reservoir simulation is used to evaluate the geothermal reservoir performance using as design parameters the well spacing and the length of the horizontal wells. The results obtained from the numerical simulations are used to build a response surface model based on the multiple linear regression method. The optimum configuration of the sedimentary geothermal systems is obtained from the analysis of the response surface model. The proposed methodology is applied to a case study based on a reservoir model of the Lyons sandstone formation, located in the Wattenberg field,more » Denver-Julesburg basin, Colorado.« less

Authors:
; ; ;
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Geothermal Technologies Office (EE-4G)
OSTI Identifier:
1357735
Report Number(s):
NREL/CP-6A20-66408
DOE Contract Number:
AC36-08GO28308
Resource Type:
Conference
Resource Relation:
Conference: Presented at the Geothermal Resources Council Annual Meeting (GRC 2016), 23-26 October 2016, Sacramento, California
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; sedimentary geothermal; numerical modeling; reservoir engineering; reservoir simulation; reservoir enhancement techniques; thermal recovery; optimization

Citation Formats

Zhou, Mengnan, Cho, JaeKyoung, Zerpa, Luis E., and Augustine, Chad. Optimization of Well Configuration for a Sedimentary Enhanced Geothermal Reservoir. United States: N. p., 2017. Web.
Zhou, Mengnan, Cho, JaeKyoung, Zerpa, Luis E., & Augustine, Chad. Optimization of Well Configuration for a Sedimentary Enhanced Geothermal Reservoir. United States.
Zhou, Mengnan, Cho, JaeKyoung, Zerpa, Luis E., and Augustine, Chad. Mon . "Optimization of Well Configuration for a Sedimentary Enhanced Geothermal Reservoir". United States. doi:.
@article{osti_1357735,
title = {Optimization of Well Configuration for a Sedimentary Enhanced Geothermal Reservoir},
author = {Zhou, Mengnan and Cho, JaeKyoung and Zerpa, Luis E. and Augustine, Chad},
abstractNote = {The extraction of geothermal energy in the form of hot water from sedimentary rock formations could expand the current geothermal energy resources toward new regions. From previous work, we observed that sedimentary geothermal reservoirs with relatively low permeability would require the application of enhancement techniques (e.g., well hydraulic stimulation) to achieve commercial production/injection rates. In this paper we extend our previous work to develop a methodology to determine the optimum well configuration that maximizes the hydraulic performance of the geothermal system. The geothermal systems considered consist of one vertical well doublet system with hydraulic fractures, and three horizontal well configurations with open-hole completion, longitudinal fractures and transverse fractures, respectively. A commercial thermal reservoir simulation is used to evaluate the geothermal reservoir performance using as design parameters the well spacing and the length of the horizontal wells. The results obtained from the numerical simulations are used to build a response surface model based on the multiple linear regression method. The optimum configuration of the sedimentary geothermal systems is obtained from the analysis of the response surface model. The proposed methodology is applied to a case study based on a reservoir model of the Lyons sandstone formation, located in the Wattenberg field, Denver-Julesburg basin, Colorado.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}

Conference:
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  • In-situ determination of Q/sub v/ (effective concentration of clay-exchange cations) of sedimentary rocks using geophysical well logs is discussed with application to geothermal reservoirs. A method is proposed based on the solution of equations relating formation rock and fluid properties and the conductivity of mud filtrate to the data obtained from S.P. (Spontaneous Potential) and resistivity logs. The application of the proposed method to some wells in the Cerro Prieto Geothermal field in Mexico is discussed. 12 refs.
  • Three geothermal wells tapping the Dogger aquifer were studied in detail for their variations in chemical composition with time or conditions of exploitation. Analytical improvements for the determination of Cl, SO{sub 4}, Ca, Mg, Na and K make it possible to detect variations respectively of 0.15, 0.8, 0.6, 1.8, 1.8 and 1.4 %. Despite the fact that the natural flow may be important in some parts of the basin aquifer, we conclude that this factor is not responsible for the small variations noticed in mineralization within the one year survey period. The results concerning reactive and nonreactive species are bestmore » explained if a vertical heterogeneity of the chemistry of the fluid is assumed. A number of calcareous sub-layers, already demonstrated by geological studies, contribute to varying degrees to the production of the hot water. The changes in pumping rates, which are fixed according to external requirements, play a major role in the hydrodynamic and chemical disequilibrium of the wells. The consequences for the geothermal exploitations are emphasized.« less
  • There is increased recognition that geothermal energy resources are more widespread than previously thought, with potential for providing a significant amount of sustainable clean energy worldwide. Recent advances in drilling, completion, and production technology from the oil and gas industry can now be applied to unlock vast new geothermal resources, with some estimates for potential electricity generation from geothermal energy now on the order of 2 million megawatts. Terralog USA, in collaboration with the University of California, Irvine (UCI), are currently investigating advanced design concepts for paired horizontal well recirculation systems, optimally configured for geothermal energy recovery in permeable sedimentarymore » and crystalline formations of varying structure and material properties. This two-year research project, funded by the US Department of Energy, includes combined efforts for: 1) Resource characterization; 2) Small and large scale laboratory investigations; 3) Numerical simulation at both the laboratory and field scale; and 4) Engineering feasibility studies and economic evaluations. The research project is currently in its early stages. This paper summarizes our technical approach and preliminary findings related to potential resources, small-scale laboratory simulation, and supporting numerical simulation efforts.« less