Numerical Evaluation of Energy Extraction, CO2-Rock Interactions, and Carbon Sequestration in Enhanced Geothermal System (EGS) with Supercritical CO2 as a Working Fluid

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Conference Paper: Numerical Evaluation of Energy Extraction, CO2-Rock Interactions, and Carbon Sequestration in Enhanced Geothermal System (EGS) with Supercritical CO2 as a Working Fluid

Abstract
Recently, geothermal development in enhanced geothermal system (EGS) has been considered using supercritical CO2 as a heat transmission fluid instead of water. It is indispensable to understand the CO2-fluid-rock interactions in EGS reservoirs to evaluate the performance of energy extraction, geological CO2 sequestration, and CO2 leakage risk with supercritical CO2 instead of water as a working fluid. The objective of this work is to evaluate the effects of chemical interactions between supercritical CO2 and reservoir rocks on the energy extraction, carbon sequestration, and CO2 leakage risk assessment. We employ a simple 3-D conceptual model with a generic 5-spot well pattern to simulate the heat, flow, geochemical interactions between CO2 and rocks at high temperature and pressure of EGS reservoirs using ECO2H module of TOUGH2 code and TOUGHREACT model. We also compare the flow, heat and chemical reaction results for scCO2 as a working fluid with the ones for water as a working fluid. The simulated results shows the larger energy extraction, increasing cumulative net CO2 storage with time, and carbonate mineral precipitations, demonstrating that supercritical CO2 as a working fluid instead of water was favorable for EGS reservoirs on the geological CO2 sequestration and enhanced energy extraction. The potential CO2 leakage could result in more chemical reactions and carbon sequestration occurring in the upper-lying layers than the ones in the injection/production layer.

Authors 
Feng Pan, Brian McPherson, Peter Lichtner, John Kaszuba, Caroline Lo Ré, Satish Karra, Chuan Lu and TianFu Xu






Conference 
Thirty-Eighth Workshop on Geothermal Reservoir Engineering; Stanford, CA; 2013/02/11


Published 
Stanford University, Stanford Geothermal Program, 2013





DOI 
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Online 
Internet link for Numerical Evaluation of Energy Extraction, CO2-Rock Interactions, and Carbon Sequestration in Enhanced Geothermal System (EGS) with Supercritical CO2 as a Working Fluid

Citation

Feng Pan, Brian McPherson, Peter Lichtner, John Kaszuba, Caroline Lo Ré, Satish Karra, Chuan Lu, TianFu Xu. 2013. Numerical Evaluation of Energy Extraction, CO2-Rock Interactions, and Carbon Sequestration in Enhanced Geothermal System (EGS) with Supercritical CO2 as a Working Fluid. In: Proceedings. Thirty-Eighth Workshop on Geothermal Reservoir Engineering; 2013/02/11; Stanford, CA. Stanford, CA: Stanford University, Stanford Geothermal Program; p. SGP-TR-198