The law of fracture propagation and intersection in zipper fracturing of deep shale gas wells
In response to the unclear understanding of fracture propagation and intersection interference in zipper fracturing under the factory development model of deep shale gas wells, a coupled hydro-mechanical model for zipper fracturing considering the influence of natural fracture zones was established...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2024-10-01
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| Series: | Petroleum Exploration and Development |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S187638042560543X |
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| author | Qiang WANG Yufeng WANG Yongquan HU Jinzhou ZHAO Yi SONG Cheng SHEN |
| author_facet | Qiang WANG Yufeng WANG Yongquan HU Jinzhou ZHAO Yi SONG Cheng SHEN |
| author_sort | Qiang WANG |
| collection | DOAJ |
| description | In response to the unclear understanding of fracture propagation and intersection interference in zipper fracturing under the factory development model of deep shale gas wells, a coupled hydro-mechanical model for zipper fracturing considering the influence of natural fracture zones was established based on the finite element – discrete element method. The reliability of the model was verified using experimental data and field monitoring pressure increase data. Taking the deep shale gas reservoir in southern Sichuan as an example, the propagation and interference laws of fracturing fractures under the influence of natural fracture zones with different characteristics were studied. The results show that the large approaching angle fracture zone has a blocking effect on the forward propagation of fracturing fractures and the intersection of inter well fractures. During pump shutdown, hydraulic fractures exhibit continued expansion behavior under net pressure driving. Under high stress difference, as the approaching angle of the fracture zone increases, the response well pressure increase and the total length of the fractured fracture show a trend of first decreasing and then increasing, and first increasing and then decreasing, respectively. Compared to small approach angle fracture zones, natural fracture zones with large approach angles require longer time and have greater difficulty to intersect. The width of fractures and the length of natural fractures are negatively and positively correlated with the response well pressure increase, respectively, and positively and negatively correlated with the time required for intersection, the total length of hydraulic fractures, and fracturing efficiency, respectively. As the displacement distance of the well increases, the probability of fracture intersection decreases, but the regularity between displacement distance and the response well pressure increase and the total length of fractures is not obvious. |
| format | Article |
| id | doaj-art-e8b0c50548f84cc98a110e03b9170df0 |
| institution | OA Journals |
| issn | 1876-3804 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Petroleum Exploration and Development |
| spelling | doaj-art-e8b0c50548f84cc98a110e03b9170df02025-08-20T02:17:39ZengKeAi Communications Co., Ltd.Petroleum Exploration and Development1876-38042024-10-015151316132610.1016/S1876-3804(25)60543-XThe law of fracture propagation and intersection in zipper fracturing of deep shale gas wellsQiang WANG0Yufeng WANG1Yongquan HU2Jinzhou ZHAO3Yi SONG4Cheng SHEN5State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China; Corresponding author.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaState Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, ChinaShale Gas Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, ChinaShale Gas Research Institute, PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, ChinaIn response to the unclear understanding of fracture propagation and intersection interference in zipper fracturing under the factory development model of deep shale gas wells, a coupled hydro-mechanical model for zipper fracturing considering the influence of natural fracture zones was established based on the finite element – discrete element method. The reliability of the model was verified using experimental data and field monitoring pressure increase data. Taking the deep shale gas reservoir in southern Sichuan as an example, the propagation and interference laws of fracturing fractures under the influence of natural fracture zones with different characteristics were studied. The results show that the large approaching angle fracture zone has a blocking effect on the forward propagation of fracturing fractures and the intersection of inter well fractures. During pump shutdown, hydraulic fractures exhibit continued expansion behavior under net pressure driving. Under high stress difference, as the approaching angle of the fracture zone increases, the response well pressure increase and the total length of the fractured fracture show a trend of first decreasing and then increasing, and first increasing and then decreasing, respectively. Compared to small approach angle fracture zones, natural fracture zones with large approach angles require longer time and have greater difficulty to intersect. The width of fractures and the length of natural fractures are negatively and positively correlated with the response well pressure increase, respectively, and positively and negatively correlated with the time required for intersection, the total length of hydraulic fractures, and fracturing efficiency, respectively. As the displacement distance of the well increases, the probability of fracture intersection decreases, but the regularity between displacement distance and the response well pressure increase and the total length of fractures is not obvious.http://www.sciencedirect.com/science/article/pii/S187638042560543Xdeep shale gaszipper fracturingfinite-discrete elementnatural fracture zonefracture propagation and intersection law |
| spellingShingle | Qiang WANG Yufeng WANG Yongquan HU Jinzhou ZHAO Yi SONG Cheng SHEN The law of fracture propagation and intersection in zipper fracturing of deep shale gas wells Petroleum Exploration and Development deep shale gas zipper fracturing finite-discrete element natural fracture zone fracture propagation and intersection law |
| title | The law of fracture propagation and intersection in zipper fracturing of deep shale gas wells |
| title_full | The law of fracture propagation and intersection in zipper fracturing of deep shale gas wells |
| title_fullStr | The law of fracture propagation and intersection in zipper fracturing of deep shale gas wells |
| title_full_unstemmed | The law of fracture propagation and intersection in zipper fracturing of deep shale gas wells |
| title_short | The law of fracture propagation and intersection in zipper fracturing of deep shale gas wells |
| title_sort | law of fracture propagation and intersection in zipper fracturing of deep shale gas wells |
| topic | deep shale gas zipper fracturing finite-discrete element natural fracture zone fracture propagation and intersection law |
| url | http://www.sciencedirect.com/science/article/pii/S187638042560543X |
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