Micro-mechanical properties of shale due to water/supercritical carbon dioxide-rock interaction
To investigate the impacts of water/supercritical CO2-rock interaction on the micro-mechanical properties of shale, a series of high-temperature and high-pressure immersion experiments were performed on the calcareous laminated shale samples mined from the lower submember of the third member of Pale...
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| Format: | Article |
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KeAi Communications Co., Ltd.
2023-08-01
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| Series: | Petroleum Exploration and Development |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1876380423604458 |
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| author | Ning LI Zhijun JIN Shicheng ZHANG Haibo WANG Peng YANG Yushi ZOU Tong ZHOU |
| author_facet | Ning LI Zhijun JIN Shicheng ZHANG Haibo WANG Peng YANG Yushi ZOU Tong ZHOU |
| author_sort | Ning LI |
| collection | DOAJ |
| description | To investigate the impacts of water/supercritical CO2-rock interaction on the micro-mechanical properties of shale, a series of high-temperature and high-pressure immersion experiments were performed on the calcareous laminated shale samples mined from the lower submember of the third member of Paleogene Shahejie Formation in the Jiyang Depression, Bohai Bay Basin. After that, grid nanoindentation tests were conducted to analyze the influence of immersion time, pressure, and temperature on micro-mechanical parameters. Experimental results show that the damage of shale caused by the water/supercritical CO2-rock interaction was mainly featured by the generation of induced fractures in the clay-rich laminae. In the case of soaking with supercritical CO2, the aperture of induced fracture was smaller. Due to the existence of induced fractures, the statistical averages of elastic modulus and hardness both decreased. Meanwhile, compaction and stress-induced tensile fractures could be observed around the laminae. Generally, the longer the soaking time, the higher the soaking pressure and temperature, the more significant the degradation of micro-mechanical parameters is. Compared with water-rock interaction, the supercritical CO2-rock interaction caused a lower degree of mechanical damage on the shale surface. Thus, supercritical CO2 can be used as a fracturing fluid to prevent the surface softening of induced fractures in shale reservoirs. |
| first_indexed | 2024-03-12T14:18:45Z |
| format | Article |
| id | doaj.art-af25cf609e2f46049b73ea8c265dae5e |
| institution | Directory Open Access Journal |
| issn | 1876-3804 |
| language | English |
| last_indexed | 2024-03-12T14:18:45Z |
| publishDate | 2023-08-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj.art-af25cf609e2f46049b73ea8c265dae5e2023-08-20T04:37:42ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042023-08-0150410011012Micro-mechanical properties of shale due to water/supercritical carbon dioxide-rock interactionNing LI0Zhijun JIN1Shicheng ZHANG2Haibo WANG3Peng YANG4Yushi ZOU5Tong ZHOU6State Key Laboratory of Shale Oil and Gas Enhancement Mechanisms and Effective Development, Beijing 100083, China; SINOPEC Key Laboratory of Shale Oil/Gas Exploration and Production Technology, Beijing 100083, China; State Energy Center for Shale Oil Research and Development, Beijing 100083, China; SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, ChinaState Key Laboratory of Shale Oil and Gas Enhancement Mechanisms and Effective Development, Beijing 100083, China; State Energy Center for Shale Oil Research and Development, Beijing 100083, China; SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, China; Institute of Energy, Peking University, Beijing 100871, China; Corresponding authorState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Shale Oil and Gas Enhancement Mechanisms and Effective Development, Beijing 100083, China; State Energy Center for Shale Oil Research and Development, Beijing 100083, China; SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, ChinaState Key Laboratory of Shale Oil and Gas Enhancement Mechanisms and Effective Development, Beijing 100083, China; State Energy Center for Shale Oil Research and Development, Beijing 100083, China; SINOPEC Petroleum Exploration and Production Research Institute, Beijing 100083, ChinaTo investigate the impacts of water/supercritical CO2-rock interaction on the micro-mechanical properties of shale, a series of high-temperature and high-pressure immersion experiments were performed on the calcareous laminated shale samples mined from the lower submember of the third member of Paleogene Shahejie Formation in the Jiyang Depression, Bohai Bay Basin. After that, grid nanoindentation tests were conducted to analyze the influence of immersion time, pressure, and temperature on micro-mechanical parameters. Experimental results show that the damage of shale caused by the water/supercritical CO2-rock interaction was mainly featured by the generation of induced fractures in the clay-rich laminae. In the case of soaking with supercritical CO2, the aperture of induced fracture was smaller. Due to the existence of induced fractures, the statistical averages of elastic modulus and hardness both decreased. Meanwhile, compaction and stress-induced tensile fractures could be observed around the laminae. Generally, the longer the soaking time, the higher the soaking pressure and temperature, the more significant the degradation of micro-mechanical parameters is. Compared with water-rock interaction, the supercritical CO2-rock interaction caused a lower degree of mechanical damage on the shale surface. Thus, supercritical CO2 can be used as a fracturing fluid to prevent the surface softening of induced fractures in shale reservoirs.http://www.sciencedirect.com/science/article/pii/S1876380423604458shalehydrationsupercritical CO2micro-mechanical propertiesnanoindentationshale damage |
| spellingShingle | Ning LI Zhijun JIN Shicheng ZHANG Haibo WANG Peng YANG Yushi ZOU Tong ZHOU Micro-mechanical properties of shale due to water/supercritical carbon dioxide-rock interaction Petroleum Exploration and Development shale hydration supercritical CO2 micro-mechanical properties nanoindentation shale damage |
| title | Micro-mechanical properties of shale due to water/supercritical carbon dioxide-rock interaction |
| title_full | Micro-mechanical properties of shale due to water/supercritical carbon dioxide-rock interaction |
| title_fullStr | Micro-mechanical properties of shale due to water/supercritical carbon dioxide-rock interaction |
| title_full_unstemmed | Micro-mechanical properties of shale due to water/supercritical carbon dioxide-rock interaction |
| title_short | Micro-mechanical properties of shale due to water/supercritical carbon dioxide-rock interaction |
| title_sort | micro mechanical properties of shale due to water supercritical carbon dioxide rock interaction |
| topic | shale hydration supercritical CO2 micro-mechanical properties nanoindentation shale damage |
| url | http://www.sciencedirect.com/science/article/pii/S1876380423604458 |
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