Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing
This study addresses the challenges presented by the reservoirs in He-8 member in SD block of Ordos Basin, characterized by low porosity, low permeability, strong heterogeneity, and conventional fracturing fracture shapes. Utilizing fracture mechanics, this research examines the interactions between...
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Editorial Department of Petroleum Reservoir Evaluation and Development
2024-06-01
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| Series: | Youqicang pingjia yu kaifa |
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| Online Access: | https://red.magtech.org.cn/fileup/2095-1426/PDF/1720587743174-1625598221.pdf |
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| author | KONG Xiangwei,XU Hongxing,SHI Xian,CHEN Hang |
| author_facet | KONG Xiangwei,XU Hongxing,SHI Xian,CHEN Hang |
| author_sort | KONG Xiangwei,XU Hongxing,SHI Xian,CHEN Hang |
| collection | DOAJ |
| description | This study addresses the challenges presented by the reservoirs in He-8 member in SD block of Ordos Basin, characterized by low porosity, low permeability, strong heterogeneity, and conventional fracturing fracture shapes. Utilizing fracture mechanics, this research examines the interactions between temporarily blocked fractures and the initial fracture throughout their entire contact period. Key considerations include fluid pressure drop within the fracture and the rock mechanics parameters of the reservoirs in He-8 member. The study systematically analyzes the influence of various parameters such as fracture strike, well deviation angle, and azimuth angle on fracturing fracture parameters. Notable findings include: Fracturing pressure decreases with increasing well deviation angle and azimuth angle. The initiation angle diminishes as well inclination increases, reaching a nadir before decreasing further with azimuth angle adjustments. Using artificial cement samples and a large-scale experimental system with realistic triaxial physical models, the study simulates the initiation, turning, and propagation behaviors of new fractures in temporary plugging fracturing. The behaviors of initiation, steering and extension of newly formed fractures at different well inclination and azimuth angles were evaluated along with the parameters such as fracture initiation pressure and fracture stimulated area. The experimental results reveal: Both initial and secondary fracture pressures tend to decrease as well inclination increases, making fractures more prone to turning and significantly enlarging the modifiable area. With consistent trap inclination, fracture initiation pressure decreases and the fracture modification area expands as bore azimuth increases. Fractures resulting from azimuthal 90° spiral perforation exhibit greater complexity compared to those from azimuthal 0° spiral perforation. Additionally, fixed surface perforation techniques can regulate fracture pressure and the initial fracture positions in horizontal wells, recommending a perforation angle between 75° and 90°. These findings offer valuable insights for the design of temporary plugs and fracturing strategies in low-permeability tight sandstone oil and gas reservoirs. |
| format | Article |
| id | doaj-art-2fe80c374a9b4dc785cc003ef5bca682 |
| institution | DOAJ |
| issn | 2095-1426 |
| language | zho |
| publishDate | 2024-06-01 |
| publisher | Editorial Department of Petroleum Reservoir Evaluation and Development |
| record_format | Article |
| series | Youqicang pingjia yu kaifa |
| spelling | doaj-art-2fe80c374a9b4dc785cc003ef5bca6822025-08-20T03:19:18ZzhoEditorial Department of Petroleum Reservoir Evaluation and DevelopmentYouqicang pingjia yu kaifa2095-14262024-06-0114339140110.13809/j.cnki.cn32-1825/te.2024.03.009Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturingKONG Xiangwei,XU Hongxing,SHI Xian,CHEN Hang01. School of petroleum engineering, Yangtze University, Wuhan, Hubei 430100, China;2. Hubei Key Laboratory of Oil and Gas Drilling and Production Engineering, Yangtze University, Wuhan, Hubei 430100, China;3. CCDC Changqing Downhole Technology Company, Xi'an, Shaanxi 710000, China;4. School of Petroleum Engineering, China University of Petroleum（East China）, Qingdao, Shandong 266000, China;5. The 10th Oil Production Plant of PetroChina Changqing Oilfield Branch, Qingyang, Gansu 745100, ChinaThis study addresses the challenges presented by the reservoirs in He-8 member in SD block of Ordos Basin, characterized by low porosity, low permeability, strong heterogeneity, and conventional fracturing fracture shapes. Utilizing fracture mechanics, this research examines the interactions between temporarily blocked fractures and the initial fracture throughout their entire contact period. Key considerations include fluid pressure drop within the fracture and the rock mechanics parameters of the reservoirs in He-8 member. The study systematically analyzes the influence of various parameters such as fracture strike, well deviation angle, and azimuth angle on fracturing fracture parameters. Notable findings include: Fracturing pressure decreases with increasing well deviation angle and azimuth angle. The initiation angle diminishes as well inclination increases, reaching a nadir before decreasing further with azimuth angle adjustments. Using artificial cement samples and a large-scale experimental system with realistic triaxial physical models, the study simulates the initiation, turning, and propagation behaviors of new fractures in temporary plugging fracturing. The behaviors of initiation, steering and extension of newly formed fractures at different well inclination and azimuth angles were evaluated along with the parameters such as fracture initiation pressure and fracture stimulated area. The experimental results reveal: Both initial and secondary fracture pressures tend to decrease as well inclination increases, making fractures more prone to turning and significantly enlarging the modifiable area. With consistent trap inclination, fracture initiation pressure decreases and the fracture modification area expands as bore azimuth increases. Fractures resulting from azimuthal 90° spiral perforation exhibit greater complexity compared to those from azimuthal 0° spiral perforation. Additionally, fixed surface perforation techniques can regulate fracture pressure and the initial fracture positions in horizontal wells, recommending a perforation angle between 75° and 90°. These findings offer valuable insights for the design of temporary plugs and fracturing strategies in low-permeability tight sandstone oil and gas reservoirs.https://red.magtech.org.cn/fileup/2095-1426/PDF/1720587743174-1625598221.pdf|true triaxial|temporary plugging fracturing|fracture initiation and morphology|breakdown pressure|fracturing angle|fracture stimulation surface area |
| spellingShingle | KONG Xiangwei,XU Hongxing,SHI Xian,CHEN Hang Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing Youqicang pingjia yu kaifa |true triaxial|temporary plugging fracturing|fracture initiation and morphology|breakdown pressure|fracturing angle|fracture stimulation surface area |
| title | Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing |
| title_full | Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing |
| title_fullStr | Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing |
| title_full_unstemmed | Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing |
| title_short | Experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing |
| title_sort | experimental simulation of fracture initiation and morphology in tight sandstone gas reservoirs temporary plugging fracturing |
| topic | |true triaxial|temporary plugging fracturing|fracture initiation and morphology|breakdown pressure|fracturing angle|fracture stimulation surface area |
| url | https://red.magtech.org.cn/fileup/2095-1426/PDF/1720587743174-1625598221.pdf |
| work_keys_str_mv | AT kongxiangweixuhongxingshixianchenhang experimentalsimulationoffractureinitiationandmorphologyintightsandstonegasreservoirstemporarypluggingfracturing |