TY - JOUR
T1 - Use closed reservoirs for CO2 storage and heat recovery
T2 - A two-stage brine-extraction and CO2-circulation strategy
AU - Chen, Mingjie
AU - Al-Maktoumi, Ali
AU - Izady, Azizallah
AU - Cai, Jianchao
AU - Dong, Yanhui
N1 - Funding Information:
This study is funded by BP Oman (Project# BP-DVC-WRC-18-01), Sultan Qaboos University (Project# IG/DVC/WRC/22/02), and Oman National Research Grant (Project# RC/RG-DVC/WRC/21/02). The support from the research group DR/RG/17 of Sultan Qaboos University, Oman, is appreciated.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/8
Y1 - 2022/8
N2 - Integrated CO2 (carbon dioxide) geologic storage (CGS) and CO2 plume geothermal (CPG) production provides an attractive approach not only to reduce atmospheric CO2 concentration but also to generate carbon-free geothermal energy to supplement electricity power. The current CGS-CPG studies are mostly limited to large-scale thick saline formations with open boundaries. Small to moderate scale closed-boundary reservoirs, which are typical for oil/gas fields, have rarely been evaluated for CGS-CPG. One of the major reasons is that the closed system has limited storage volume, and native brine has nowhere to escape to free storage space for injected CO2. This study provides a solution to this issue by implementing an innovative two-stage operational strategy to realize CGS-CPG in closed reservoirs. The proposed strategy extracts pure hot brine and CO2 in two sequential stages by two separate wells, and can effectively avoid brine-CO2 separation on ground surface. A suite of numerical models is developed to evaluate the approach with a variety of reservoir conditions and operations. Results demonstrate the feasibility of our solution for implementing CGS-CPG in closed systems, and indicate the tremendous potentials to use depleted oi/gas reservoirs as the candidate fields, which widely exist in North Oman and the world.
AB - Integrated CO2 (carbon dioxide) geologic storage (CGS) and CO2 plume geothermal (CPG) production provides an attractive approach not only to reduce atmospheric CO2 concentration but also to generate carbon-free geothermal energy to supplement electricity power. The current CGS-CPG studies are mostly limited to large-scale thick saline formations with open boundaries. Small to moderate scale closed-boundary reservoirs, which are typical for oil/gas fields, have rarely been evaluated for CGS-CPG. One of the major reasons is that the closed system has limited storage volume, and native brine has nowhere to escape to free storage space for injected CO2. This study provides a solution to this issue by implementing an innovative two-stage operational strategy to realize CGS-CPG in closed reservoirs. The proposed strategy extracts pure hot brine and CO2 in two sequential stages by two separate wells, and can effectively avoid brine-CO2 separation on ground surface. A suite of numerical models is developed to evaluate the approach with a variety of reservoir conditions and operations. Results demonstrate the feasibility of our solution for implementing CGS-CPG in closed systems, and indicate the tremendous potentials to use depleted oi/gas reservoirs as the candidate fields, which widely exist in North Oman and the world.
KW - Brine extraction
KW - Closed system
KW - CO circulation
KW - Fault-blocked reservoirs
KW - Geothermal energy harvest
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U2 - 10.1016/j.seta.2022.102346
DO - 10.1016/j.seta.2022.102346
M3 - Article
AN - SCOPUS:85131421021
SN - 2213-1388
VL - 52
JO - Sustainable Energy Technologies and Assessments
JF - Sustainable Energy Technologies and Assessments
M1 - 102346
ER -