Simulation of fracture control during temporary plugging at fracture openings in deep and ultra-deep shale-gas horizontal wells
When deep and ultra-deep shale gas well fracturing is carried out, multi-cluster fracturing can hardly realize synchronous initiation and propagation of hydraulic fractures due to the combined effects of heterogeneity of deep in-situ stress and ''dense cluster'' fracture arrangem...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2022-10-01
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| Series: | Natural Gas Industry B |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854022000638 |
| _version_ | 1797287997050191872 |
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| author | Dongfeng Hu Lan Ren Zhenxiang Li Jinzhou Zhao Ran Lin Tingxue Jiang |
| author_facet | Dongfeng Hu Lan Ren Zhenxiang Li Jinzhou Zhao Ran Lin Tingxue Jiang |
| author_sort | Dongfeng Hu |
| collection | DOAJ |
| description | When deep and ultra-deep shale gas well fracturing is carried out, multi-cluster fracturing can hardly realize synchronous initiation and propagation of hydraulic fractures due to the combined effects of heterogeneity of deep in-situ stress and ''dense cluster'' fracture arrangement, and the strong interference between fractures aggravates the unbalanced fracture propagation degree. Field practice proves that the fracture-opening temporary plugging fracturing technology can effectively control the unbalanced propagation of multiple fractures. In addition, the application effect of temporary plugging process can be improved by developing a method for simulating fracture control during fracture-opening temporary plugging fracturing of deep/ultra-deep shale-gas horizontal wells. Based on rock mechanics, elasticity mechanics, fluid mechanics and fracture propagation theory, combined with the flow distribution equation of horizontal-well multi-cluster fracturing and the plugging equation of temporary plugging balls, this paper establishes a fracture propagation model and a fracture control simulation method for the fracture-opening temporary plugging fracturing of deep/ultra-deep shale gas horizontal wells. Then, the influences of the number of temporary plugging balls and the times and timing of temporary plugging on temporary plugging control are simulated, and the influences of temporary plugging balls on fracture propagation morphology and SRV (stimulated reservoir volume) distribution are analyzed by taking Sinopec's one deep shale gas well in Dingshan-Dongxi structure of southeast Sichuan Basin as an example. And the following research results are obtained. First, fracture-opening temporary plugging can significantly promote the balanced propagation of multiple fractures, and the simulation confirms that the number of temporary plugging balls and the times and timing of temporary plugging play an important role in fracture control. Second, as the number of temporary plugging balls increase, the SRV increases firstly and then decreases, so there is an optimal number of temporary plugging balls. Third, increasing the times of temporary plugging can improve the fault tolerance rate of temporary plugging and diverting process, but it is necessary to increase the number of temporary plugging balls appropriately. Fourth, when the timing of temporary plugging is appropriate, the balanced propagation of multiple fractures is achieved and the maximum SRV is reached. In conclusion, this method is of great significance to optimizing the design of temporary plugging fracturing, improve the implementation level of field process and develop deep and ultra-deep shale gas efficiently. |
| first_indexed | 2024-03-07T18:41:58Z |
| format | Article |
| id | doaj.art-deb4be29e7bb4f23bb2c550f49590876 |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2024-03-07T18:41:58Z |
| publishDate | 2022-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Natural Gas Industry B |
| spelling | doaj.art-deb4be29e7bb4f23bb2c550f495908762024-03-02T03:47:52ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402022-10-0195487496Simulation of fracture control during temporary plugging at fracture openings in deep and ultra-deep shale-gas horizontal wellsDongfeng Hu0Lan Ren1Zhenxiang Li2Jinzhou Zhao3Ran Lin4Tingxue Jiang5Sinopec Exploration Company, Chengdu, Sichuan 610041, ChinaState Key Laboratory of Oil & Gas Reservoir Geology and Exploitation//Southwest Petroleum University, Chengdu, Sichuan 610500, China; Corresponding author.Sinopec Exploration Company, Chengdu, Sichuan 610041, ChinaState Key Laboratory of Oil & Gas Reservoir Geology and Exploitation//Southwest Petroleum University, Chengdu, Sichuan 610500, ChinaState Key Laboratory of Oil & Gas Reservoir Geology and Exploitation//Southwest Petroleum University, Chengdu, Sichuan 610500, ChinaSinopec Research Institute of Petroleum Engineering, Beijing 100101, ChinaWhen deep and ultra-deep shale gas well fracturing is carried out, multi-cluster fracturing can hardly realize synchronous initiation and propagation of hydraulic fractures due to the combined effects of heterogeneity of deep in-situ stress and ''dense cluster'' fracture arrangement, and the strong interference between fractures aggravates the unbalanced fracture propagation degree. Field practice proves that the fracture-opening temporary plugging fracturing technology can effectively control the unbalanced propagation of multiple fractures. In addition, the application effect of temporary plugging process can be improved by developing a method for simulating fracture control during fracture-opening temporary plugging fracturing of deep/ultra-deep shale-gas horizontal wells. Based on rock mechanics, elasticity mechanics, fluid mechanics and fracture propagation theory, combined with the flow distribution equation of horizontal-well multi-cluster fracturing and the plugging equation of temporary plugging balls, this paper establishes a fracture propagation model and a fracture control simulation method for the fracture-opening temporary plugging fracturing of deep/ultra-deep shale gas horizontal wells. Then, the influences of the number of temporary plugging balls and the times and timing of temporary plugging on temporary plugging control are simulated, and the influences of temporary plugging balls on fracture propagation morphology and SRV (stimulated reservoir volume) distribution are analyzed by taking Sinopec's one deep shale gas well in Dingshan-Dongxi structure of southeast Sichuan Basin as an example. And the following research results are obtained. First, fracture-opening temporary plugging can significantly promote the balanced propagation of multiple fractures, and the simulation confirms that the number of temporary plugging balls and the times and timing of temporary plugging play an important role in fracture control. Second, as the number of temporary plugging balls increase, the SRV increases firstly and then decreases, so there is an optimal number of temporary plugging balls. Third, increasing the times of temporary plugging can improve the fault tolerance rate of temporary plugging and diverting process, but it is necessary to increase the number of temporary plugging balls appropriately. Fourth, when the timing of temporary plugging is appropriate, the balanced propagation of multiple fractures is achieved and the maximum SRV is reached. In conclusion, this method is of great significance to optimizing the design of temporary plugging fracturing, improve the implementation level of field process and develop deep and ultra-deep shale gas efficiently.http://www.sciencedirect.com/science/article/pii/S2352854022000638Deep and ultra-deepShale gasHorizontal wellTemporary plugging fracturingFracture controlIn-situ stress |
| spellingShingle | Dongfeng Hu Lan Ren Zhenxiang Li Jinzhou Zhao Ran Lin Tingxue Jiang Simulation of fracture control during temporary plugging at fracture openings in deep and ultra-deep shale-gas horizontal wells Natural Gas Industry B Deep and ultra-deep Shale gas Horizontal well Temporary plugging fracturing Fracture control In-situ stress |
| title | Simulation of fracture control during temporary plugging at fracture openings in deep and ultra-deep shale-gas horizontal wells |
| title_full | Simulation of fracture control during temporary plugging at fracture openings in deep and ultra-deep shale-gas horizontal wells |
| title_fullStr | Simulation of fracture control during temporary plugging at fracture openings in deep and ultra-deep shale-gas horizontal wells |
| title_full_unstemmed | Simulation of fracture control during temporary plugging at fracture openings in deep and ultra-deep shale-gas horizontal wells |
| title_short | Simulation of fracture control during temporary plugging at fracture openings in deep and ultra-deep shale-gas horizontal wells |
| title_sort | simulation of fracture control during temporary plugging at fracture openings in deep and ultra deep shale gas horizontal wells |
| topic | Deep and ultra-deep Shale gas Horizontal well Temporary plugging fracturing Fracture control In-situ stress |
| url | http://www.sciencedirect.com/science/article/pii/S2352854022000638 |
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