TY - JOUR
T1 - Numerical investigation of CO2-carbonated water-alternating-gas on enhanced oil recovery and geological carbon storage
AU - Ji, Minsoo
AU - Kwon, Seoyoon
AU - Choi, Suin
AU - Kim, Min
AU - Choi, Byungin
AU - Min, Baehyun
N1 - Publisher Copyright:
© 2023 The Authors
PY - 2023/8
Y1 - 2023/8
N2 - This study investigates the potential of a novel CO2-carbonated water-alternating-gas (CWAG) injection method for enhanced oil recovery (EOR) and geological carbon storage. The Weyburn fluid data acquired from Canada are used in a compositional reservoir simulation of a CO2-CWAG case study with seven cycles in order to analyze the effects of carbonated water (CW) upon the oil recovery and CO2 storage capacity of a multi-phase CO2/brine/oil system. The study includes an assessment of the CO2 plume propagation and retention via structural, residual, and solubility trapping mechanisms. The numerical results demonstrate that CO2-CWAG yields a 6.7% increase in oil recovery compared to continuous CO2 flooding (from 68.4% to 73.0%) and a 1.4% increase compared to CO2-WAG (from 72.0% to 73.0%). During the CO2-CWAG operation, increasing the molarity of CO2 from 0.0 mol/L to 1.2 mol/L in carbonated water results in a 6.7% increase in the amount of geologically stored CO2 (from 6191 tons to 6608 tons). In brief, CO2-CWAG improves not only oil recovery but also CO2 storage capacity in terms of the three trapping mechanisms, thus making it a promising low-carbon EOR method that could help reduce CO2 emissions in the oil and gas industry.
AB - This study investigates the potential of a novel CO2-carbonated water-alternating-gas (CWAG) injection method for enhanced oil recovery (EOR) and geological carbon storage. The Weyburn fluid data acquired from Canada are used in a compositional reservoir simulation of a CO2-CWAG case study with seven cycles in order to analyze the effects of carbonated water (CW) upon the oil recovery and CO2 storage capacity of a multi-phase CO2/brine/oil system. The study includes an assessment of the CO2 plume propagation and retention via structural, residual, and solubility trapping mechanisms. The numerical results demonstrate that CO2-CWAG yields a 6.7% increase in oil recovery compared to continuous CO2 flooding (from 68.4% to 73.0%) and a 1.4% increase compared to CO2-WAG (from 72.0% to 73.0%). During the CO2-CWAG operation, increasing the molarity of CO2 from 0.0 mol/L to 1.2 mol/L in carbonated water results in a 6.7% increase in the amount of geologically stored CO2 (from 6191 tons to 6608 tons). In brief, CO2-CWAG improves not only oil recovery but also CO2 storage capacity in terms of the three trapping mechanisms, thus making it a promising low-carbon EOR method that could help reduce CO2 emissions in the oil and gas industry.
KW - CO-carbonated water-alternating-gas (CO-CWAG)
KW - Enhanced oil recovery
KW - Geological carbon storage
KW - Trapping mechanisms
UR - http://www.scopus.com/inward/record.url?scp=85164285460&partnerID=8YFLogxK
U2 - 10.1016/j.jcou.2023.102544
DO - 10.1016/j.jcou.2023.102544
M3 - Article
AN - SCOPUS:85164285460
SN - 2212-9820
VL - 74
JO - Journal of CO2 Utilization
JF - Journal of CO2 Utilization
M1 - 102544
ER -