Experimental and modeling assessment of CO2 EOR and storage performances in tight oil reservoir, Yanchang oilfield, China
Previous experimental studies have shown that CO2 injections can significantly enhance oil recovery in tight oil reservoirs and sequestrate CO2 permanently. However, performance varies in places when the technologies are scaled up in field pilot tests. Therefore, investigating CO2 EOR (Enhanced Oil...
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Elsevier
2025-07-01
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| Series: | Journal of CO2 Utilization |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S221298202500109X |
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| author | Hong Yang Heng Wang Xiangzeng Wang Yuchen Xin Lijun He Zunsheng Jiao Jie Zou |
| author_facet | Hong Yang Heng Wang Xiangzeng Wang Yuchen Xin Lijun He Zunsheng Jiao Jie Zou |
| author_sort | Hong Yang |
| collection | DOAJ |
| description | Previous experimental studies have shown that CO2 injections can significantly enhance oil recovery in tight oil reservoirs and sequestrate CO2 permanently. However, performance varies in places when the technologies are scaled up in field pilot tests. Therefore, investigating CO2 EOR (Enhanced Oil Recovery) and storage mechanisms during CO2 injection in field-scale tight sandstone reservoirs is crucial. In this study, laboratory Pressure-Volume-Texperature (PVT) tests and field pilot tests of CO2 injection in a tight oil reservoir of the Yanchang oilfield in the Ordos Basin were analyzed. Reservoir simulations of CO2 injections, including continuous and water alternative gas injections, are conducted after history matching. Laboratory PVT results show that oil viscosity decreases from 5.10 to 2.38 mPa·s as pressure reduces from initial formation conditions to atmospheric pressure, and swells oil to 1.50 times at a saturation pressure of 240.0 bar, which is larger than the minimum miscible pressure of 178.0 bar from the slim tube test. Reservoir simulation results of continuous and WAG injection scenarios show that oil production increases with CO2 injection rate, and oil recovery increments are 21.6 % and 19.3 %, respectively, for Case 3 and Case 5. This is because reservoir pressure increases with more injected CO2, resulting in higher displacement efficiency, and larger amounts of CO2 can also lead to higher sweep efficiency in the lateral directions. However, CO2 EOR efficiency decreases gradually after the CO2 breakthrough. In addition, CO2 migration in the lateral direction relates to the CO2 injection rate. The areas of dissolved CO2 are larger than those of gaseous CO2, especially for WAG cases, while both increase with CO2 injection rate due to a larger pressure gradient. The amount of CO2 through structural trapping for the continuous injection cases is higher than solubility trapping, followed by residual trapping. Differently, the amounts of gaseous CO2 are close to those of the dissolved CO2 for the WAG cases due to water injection. The findings in this study are significant for understanding and demonstrating the CO2 EOR, storage mechanisms in lab and field scales, and provide a valuable reference for scaling up the technologies in tight oil reservoirs. |
| format | Article |
| id | doaj-art-51db7dee75514ee487b95cb5e67ee7fa |
| institution | OA Journals |
| issn | 2212-9839 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of CO2 Utilization |
| spelling | doaj-art-51db7dee75514ee487b95cb5e67ee7fa2025-08-20T02:05:09ZengElsevierJournal of CO2 Utilization2212-98392025-07-019710312510.1016/j.jcou.2025.103125Experimental and modeling assessment of CO2 EOR and storage performances in tight oil reservoir, Yanchang oilfield, ChinaHong Yang0Heng Wang1Xiangzeng Wang2Yuchen Xin3Lijun He4Zunsheng Jiao5Jie Zou6Department of Geology, Northwestern University, Xi’an 710000, China; Shaanxi Key Laboratory of Carbon Dioxide Sequestration and Enhanced Oil Recovery, Xi’an 710065, China; Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi’an 710065, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China; Center for Economic Geology Research, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USA; Corresponding author at: State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China.Shaanxi Key Laboratory of Carbon Dioxide Sequestration and Enhanced Oil Recovery, Xi’an 710065, China; Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi’an 710065, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, ChinaCenter for Economic Geology Research, University of Wyoming, 1000 E. University Avenue, Laramie, WY 82071, USAFaculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, ChinaPrevious experimental studies have shown that CO2 injections can significantly enhance oil recovery in tight oil reservoirs and sequestrate CO2 permanently. However, performance varies in places when the technologies are scaled up in field pilot tests. Therefore, investigating CO2 EOR (Enhanced Oil Recovery) and storage mechanisms during CO2 injection in field-scale tight sandstone reservoirs is crucial. In this study, laboratory Pressure-Volume-Texperature (PVT) tests and field pilot tests of CO2 injection in a tight oil reservoir of the Yanchang oilfield in the Ordos Basin were analyzed. Reservoir simulations of CO2 injections, including continuous and water alternative gas injections, are conducted after history matching. Laboratory PVT results show that oil viscosity decreases from 5.10 to 2.38 mPa·s as pressure reduces from initial formation conditions to atmospheric pressure, and swells oil to 1.50 times at a saturation pressure of 240.0 bar, which is larger than the minimum miscible pressure of 178.0 bar from the slim tube test. Reservoir simulation results of continuous and WAG injection scenarios show that oil production increases with CO2 injection rate, and oil recovery increments are 21.6 % and 19.3 %, respectively, for Case 3 and Case 5. This is because reservoir pressure increases with more injected CO2, resulting in higher displacement efficiency, and larger amounts of CO2 can also lead to higher sweep efficiency in the lateral directions. However, CO2 EOR efficiency decreases gradually after the CO2 breakthrough. In addition, CO2 migration in the lateral direction relates to the CO2 injection rate. The areas of dissolved CO2 are larger than those of gaseous CO2, especially for WAG cases, while both increase with CO2 injection rate due to a larger pressure gradient. The amount of CO2 through structural trapping for the continuous injection cases is higher than solubility trapping, followed by residual trapping. Differently, the amounts of gaseous CO2 are close to those of the dissolved CO2 for the WAG cases due to water injection. The findings in this study are significant for understanding and demonstrating the CO2 EOR, storage mechanisms in lab and field scales, and provide a valuable reference for scaling up the technologies in tight oil reservoirs.http://www.sciencedirect.com/science/article/pii/S221298202500109XTight oil reservoirCO2 EOR and storageField pilot testPVT experimentsNumerical simulation |
| spellingShingle | Hong Yang Heng Wang Xiangzeng Wang Yuchen Xin Lijun He Zunsheng Jiao Jie Zou Experimental and modeling assessment of CO2 EOR and storage performances in tight oil reservoir, Yanchang oilfield, China Journal of CO2 Utilization Tight oil reservoir CO2 EOR and storage Field pilot test PVT experiments Numerical simulation |
| title | Experimental and modeling assessment of CO2 EOR and storage performances in tight oil reservoir, Yanchang oilfield, China |
| title_full | Experimental and modeling assessment of CO2 EOR and storage performances in tight oil reservoir, Yanchang oilfield, China |
| title_fullStr | Experimental and modeling assessment of CO2 EOR and storage performances in tight oil reservoir, Yanchang oilfield, China |
| title_full_unstemmed | Experimental and modeling assessment of CO2 EOR and storage performances in tight oil reservoir, Yanchang oilfield, China |
| title_short | Experimental and modeling assessment of CO2 EOR and storage performances in tight oil reservoir, Yanchang oilfield, China |
| title_sort | experimental and modeling assessment of co2 eor and storage performances in tight oil reservoir yanchang oilfield china |
| topic | Tight oil reservoir CO2 EOR and storage Field pilot test PVT experiments Numerical simulation |
| url | http://www.sciencedirect.com/science/article/pii/S221298202500109X |
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