Mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured-vuggy reservoirs
To get a deeper understanding on the formation mechanisms and distribution laws of remaining oil during water flooding, and enhanced oil recovery (EOR) mechanisms by reversing water injection after water flooding, 3D visualization models of fractured-vuggy reservoir were constructed based on the ele...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2022-10-01
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| Series: | Petroleum Exploration and Development |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380422603367 |
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| author | Jing WANG Xiangsheng QI Huiqing LIU Min YANG Xiaobo LI Hongguang LIU Tuozheng ZHANG |
| author_facet | Jing WANG Xiangsheng QI Huiqing LIU Min YANG Xiaobo LI Hongguang LIU Tuozheng ZHANG |
| author_sort | Jing WANG |
| collection | DOAJ |
| description | To get a deeper understanding on the formation mechanisms and distribution laws of remaining oil during water flooding, and enhanced oil recovery (EOR) mechanisms by reversing water injection after water flooding, 3D visualization models of fractured-vuggy reservoir were constructed based on the elements and configuration of fractures and vugs, and typical fracture-vug structures by using advanced CT scanning and 3D printing technologies. Then, water flooding and reversing water injection experiments were conducted. The formation mechanisms of remaining oil during water flooding include inadequate injection-production well control, gravity difference between oil and water, interference between different flow channels, isolation by low connectivity channel, weak hydrodynamic force at the far end. Under the above effects, 7 kinds of remaining oil may come about, imperfect well-control oil, blind side oil, attic oil at the reservoir top, by-pass residual oil under gravity, by-pass residual oil in secondary channel, isolated oil in low connectivity channel, and remaining oil at far and weakly connected end. Some remaining oil can be recovered by reversing water injection after water flooding, but its EOR is related to the remaining oil type, fracture-cavity structure and reversing injection-production structure. Five of the above seven kinds of remaining oil can be produced by six EOR mechanisms of reversing water injection: gravity displacement, opening new flow channel, rising the outflow point, hydrodynamic force enhancement, vertically equilibrium displacement, and synergistic effect of hydrodynamic force and gravity. |
| first_indexed | 2024-04-11T07:23:30Z |
| format | Article |
| id | doaj.art-a6956147089644ca9c6db78b391f5052 |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-04-11T07:23:30Z |
| publishDate | 2022-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-a6956147089644ca9c6db78b391f50522022-12-22T04:37:09ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042022-10-0149511101125Mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured-vuggy reservoirsJing WANG0Xiangsheng QI1Huiqing LIU2Min YANG3Xiaobo LI4Hongguang LIU5Tuozheng ZHANG6State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, China; Corresponding authorState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaResearch Institute of Exploration and Development, Northwest Oilfield Company, Sinopec, Urumqi 830011, ChinaResearch Institute of Exploration and Development, Northwest Oilfield Company, Sinopec, Urumqi 830011, ChinaResearch Institute of Exploration and Development, Northwest Oilfield Company, Sinopec, Urumqi 830011, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China; MOE Key Laboratory of Petroleum Engineering, China University of Petroleum, Beijing 102249, ChinaTo get a deeper understanding on the formation mechanisms and distribution laws of remaining oil during water flooding, and enhanced oil recovery (EOR) mechanisms by reversing water injection after water flooding, 3D visualization models of fractured-vuggy reservoir were constructed based on the elements and configuration of fractures and vugs, and typical fracture-vug structures by using advanced CT scanning and 3D printing technologies. Then, water flooding and reversing water injection experiments were conducted. The formation mechanisms of remaining oil during water flooding include inadequate injection-production well control, gravity difference between oil and water, interference between different flow channels, isolation by low connectivity channel, weak hydrodynamic force at the far end. Under the above effects, 7 kinds of remaining oil may come about, imperfect well-control oil, blind side oil, attic oil at the reservoir top, by-pass residual oil under gravity, by-pass residual oil in secondary channel, isolated oil in low connectivity channel, and remaining oil at far and weakly connected end. Some remaining oil can be recovered by reversing water injection after water flooding, but its EOR is related to the remaining oil type, fracture-cavity structure and reversing injection-production structure. Five of the above seven kinds of remaining oil can be produced by six EOR mechanisms of reversing water injection: gravity displacement, opening new flow channel, rising the outflow point, hydrodynamic force enhancement, vertically equilibrium displacement, and synergistic effect of hydrodynamic force and gravity.http://www.sciencedirect.com/science/article/pii/S1876380422603367fractured-vuggy reservoirwater floodingremaining oilreversing water injectionstimulation mechanismenhanced oil recovery |
| spellingShingle | Jing WANG Xiangsheng QI Huiqing LIU Min YANG Xiaobo LI Hongguang LIU Tuozheng ZHANG Mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured-vuggy reservoirs Petroleum Exploration and Development fractured-vuggy reservoir water flooding remaining oil reversing water injection stimulation mechanism enhanced oil recovery |
| title | Mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured-vuggy reservoirs |
| title_full | Mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured-vuggy reservoirs |
| title_fullStr | Mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured-vuggy reservoirs |
| title_full_unstemmed | Mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured-vuggy reservoirs |
| title_short | Mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured-vuggy reservoirs |
| title_sort | mechanisms of remaining oil formation by water flooding and enhanced oil recovery by reversing water injection in fractured vuggy reservoirs |
| topic | fractured-vuggy reservoir water flooding remaining oil reversing water injection stimulation mechanism enhanced oil recovery |
| url | http://www.sciencedirect.com/science/article/pii/S1876380422603367 |
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