Evaluation of CO 2 -Fluid-Rock Interaction in Enhanced Geothermal Systems: Field-Scale Geochemical Simulations
Abstract
Recent studies suggest that using supercritical CO 2 (scCO 2 ) instead of water as a heat transmission fluid in Enhanced Geothermal Systems (EGS) may improve energy extraction. While CO 2 -fluid-rock interactions at “typical” temperatures and pressures of subsurface reservoirs are fairly well known, such understanding for the elevated conditions of EGS is relatively unresolved. Geochemical impacts of CO 2 as a working fluid (“CO 2 -EGS”) compared to those for water as a working fluid (H 2 O-EGS) are needed. The primary objectives of this study are (1) constraining geochemical processes associated with CO 2 -fluid-rock interactions under the high pressures and temperatures of a typical CO 2 -EGS site and (2) comparing geochemical impacts of CO 2 -EGS to geochemical impacts of H 2 O-EGS. The St. John’s Dome CO 2 -EGS research site in Arizona was adopted as a case study. A 3D model of the site was developed. Net heat extraction and mass flow production rates for CO 2 -EGS were larger compared to H 2 O-EGS, suggesting that using scCO 2 as a working fluid may enhance EGS heat extraction. More aqueous CO 2 accumulates within upper- and lower-lying layers than in the injection/productionmore »
- Authors:
-
- Energy & Geoscience Institute, The University of Utah, Salt Lake City, UT 84108, USA, Department of Civil and Environmental Engineering, The University of Utah, Salt Lake City, UT 84112, USA
- Department of Geology & Geophysics, The University of Wyoming, Laramie, WY 82071, USA, School of Energy Resources, The University of Wyoming, Laramie, WY 82071, USA
- Publication Date:
- Research Org.:
- Univ. of Utah, Salt Lake City, UT (United States)
- Sponsoring Org.:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office; Utah Science Technology and Research Initiative (USTAR)
- OSTI Identifier:
- 1400022
- Alternate Identifier(s):
- OSTI ID: 1473908
- Grant/Contract Number:
- EE0002766
- Resource Type:
- Published Article
- Journal Name:
- Geofluids
- Additional Journal Information:
- Journal Name: Geofluids Journal Volume: 2017; Journal ID: ISSN 1468-8115
- Publisher:
- Wiley
- Country of Publication:
- Canada
- Language:
- English
- Subject:
- 58 GEOSCIENCES
Citation Formats
Pan, Feng, McPherson, Brian J., and Kaszuba, John. Evaluation of CO 2 -Fluid-Rock Interaction in Enhanced Geothermal Systems: Field-Scale Geochemical Simulations. Canada: N. p., 2017.
Web. doi:10.1155/2017/5675370.
Pan, Feng, McPherson, Brian J., & Kaszuba, John. Evaluation of CO 2 -Fluid-Rock Interaction in Enhanced Geothermal Systems: Field-Scale Geochemical Simulations. Canada. https://doi.org/10.1155/2017/5675370
Pan, Feng, McPherson, Brian J., and Kaszuba, John. Sun .
"Evaluation of CO 2 -Fluid-Rock Interaction in Enhanced Geothermal Systems: Field-Scale Geochemical Simulations". Canada. https://doi.org/10.1155/2017/5675370.
@article{osti_1400022,
title = {Evaluation of CO 2 -Fluid-Rock Interaction in Enhanced Geothermal Systems: Field-Scale Geochemical Simulations},
author = {Pan, Feng and McPherson, Brian J. and Kaszuba, John},
abstractNote = {Recent studies suggest that using supercritical CO 2 (scCO 2 ) instead of water as a heat transmission fluid in Enhanced Geothermal Systems (EGS) may improve energy extraction. While CO 2 -fluid-rock interactions at “typical” temperatures and pressures of subsurface reservoirs are fairly well known, such understanding for the elevated conditions of EGS is relatively unresolved. Geochemical impacts of CO 2 as a working fluid (“CO 2 -EGS”) compared to those for water as a working fluid (H 2 O-EGS) are needed. The primary objectives of this study are (1) constraining geochemical processes associated with CO 2 -fluid-rock interactions under the high pressures and temperatures of a typical CO 2 -EGS site and (2) comparing geochemical impacts of CO 2 -EGS to geochemical impacts of H 2 O-EGS. The St. John’s Dome CO 2 -EGS research site in Arizona was adopted as a case study. A 3D model of the site was developed. Net heat extraction and mass flow production rates for CO 2 -EGS were larger compared to H 2 O-EGS, suggesting that using scCO 2 as a working fluid may enhance EGS heat extraction. More aqueous CO 2 accumulates within upper- and lower-lying layers than in the injection/production layers, reducing pH values and leading to increased dissolution and precipitation of minerals in those upper and lower layers. Dissolution of oligoclase for water as a working fluid shows smaller magnitude in rates and different distributions in profile than those for scCO 2 as a working fluid. It indicates that geochemical processes of scCO 2 -rock interaction have significant effects on mineral dissolution and precipitation in magnitudes and distributions.},
doi = {10.1155/2017/5675370},
journal = {Geofluids},
number = ,
volume = 2017,
place = {Canada},
year = {Sun Jan 01 00:00:00 EST 2017},
month = {Sun Jan 01 00:00:00 EST 2017}
}
https://doi.org/10.1155/2017/5675370
Web of Science
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