Numerical simulation on multi-stage fractured horizontal wells in shale gas reservoirs based on the finite volume method
In order to simulate the flowing of shale gas in multi-scale media, we established a mathematical model for the unsteady seepage of multi-stage fractured horizontal wells in shale gas reservoirs in consideration of the flowing characteristics of shale gas in matrix, natural fractures and large-scale...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2019-08-01
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| Series: | Natural Gas Industry B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352854019300683 |
| _version_ | 1797282185507504128 |
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| author | Xiaofan Chen Chao Tang Zhimin Du Liandong Tang Jiabao Wei Xu Ma |
| author_facet | Xiaofan Chen Chao Tang Zhimin Du Liandong Tang Jiabao Wei Xu Ma |
| author_sort | Xiaofan Chen |
| collection | DOAJ |
| description | In order to simulate the flowing of shale gas in multi-scale media, we established a mathematical model for the unsteady seepage of multi-stage fractured horizontal wells in shale gas reservoirs in consideration of the flowing characteristics of shale gas in matrix, natural fractures and large-scale artificial fractures. Grid division in the simulation region was carried out by means of nonstructural tetrahedral grid. Then, a 3D numerical model for the seepage of shale gas was established discretely using finite volume method and solved using sequence solution method. Finally, the production performance of multi-stage fractured horizontal wells in shale gas reservoirs and the reservoir pressure distribution were simulated, and the simulation results were analyzed. And the following research results were obtained. First, the gas production rates of multi-stage fractured horizontal wells calculated by this newly established numerical simulation method are basically consistent with the calculation results by the commercial numerical simulation software Eclipse, which proves that this new model is accurate and feasible. Second, the gas production rates of horizontal wells calculated by the sequential solution method are different from those calculated by the fully implicit solution method in the early production stages, but as the calculation progresses, both of them tend to be consistent, which further verifies the accuracy of this new model. Third, desorbed gas plays a supplementary role to reservoir pressure, but its function is limited, and its effect on gas production is little. As the production goes on, the percentage of desorbed gas increases gradually. Fourth, the key to the stimulation of shale-gas horizontal wells is to determine the number of fractured sections rationally and create longer artificial fractures. In conclusion, the research results are conducive to the design of stimulated reservoir volumes (SRVs) of shale gas reservoirs and the prediction of production performance of multi-stage fractured horizontal wells. Keywords: Shale gas, Horizontal well, Stimulated reservoir volume, Finite volume method, 3D numerical simulation of seepage, Sequential solution, Fully implicit solution, Desorbed gas, Gas production rate |
| first_indexed | 2024-03-07T17:09:22Z |
| format | Article |
| id | doaj.art-fb88b02dcf384f348ee5cb8a1305c351 |
| institution | Directory Open Access Journal |
| issn | 2352-8540 |
| language | English |
| last_indexed | 2024-03-07T17:09:22Z |
| publishDate | 2019-08-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Natural Gas Industry B |
| spelling | doaj.art-fb88b02dcf384f348ee5cb8a1305c3512024-03-03T02:18:23ZengKeAi Communications Co., Ltd.Natural Gas Industry B2352-85402019-08-0164347356Numerical simulation on multi-stage fractured horizontal wells in shale gas reservoirs based on the finite volume methodXiaofan Chen0Chao Tang1Zhimin Du2Liandong Tang3Jiabao Wei4Xu Ma5State 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, China; Corresponding author.State 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, ChinaHekou Oil Production Plant, Sinopec Shengli Oilfield Company, Dongying, Shandong, 257015, ChinaNo.5 Gas Production Plant, PetroChina Changqing Oilfield Company, Xi'an, Shaanxi, 710000, ChinaIn order to simulate the flowing of shale gas in multi-scale media, we established a mathematical model for the unsteady seepage of multi-stage fractured horizontal wells in shale gas reservoirs in consideration of the flowing characteristics of shale gas in matrix, natural fractures and large-scale artificial fractures. Grid division in the simulation region was carried out by means of nonstructural tetrahedral grid. Then, a 3D numerical model for the seepage of shale gas was established discretely using finite volume method and solved using sequence solution method. Finally, the production performance of multi-stage fractured horizontal wells in shale gas reservoirs and the reservoir pressure distribution were simulated, and the simulation results were analyzed. And the following research results were obtained. First, the gas production rates of multi-stage fractured horizontal wells calculated by this newly established numerical simulation method are basically consistent with the calculation results by the commercial numerical simulation software Eclipse, which proves that this new model is accurate and feasible. Second, the gas production rates of horizontal wells calculated by the sequential solution method are different from those calculated by the fully implicit solution method in the early production stages, but as the calculation progresses, both of them tend to be consistent, which further verifies the accuracy of this new model. Third, desorbed gas plays a supplementary role to reservoir pressure, but its function is limited, and its effect on gas production is little. As the production goes on, the percentage of desorbed gas increases gradually. Fourth, the key to the stimulation of shale-gas horizontal wells is to determine the number of fractured sections rationally and create longer artificial fractures. In conclusion, the research results are conducive to the design of stimulated reservoir volumes (SRVs) of shale gas reservoirs and the prediction of production performance of multi-stage fractured horizontal wells. Keywords: Shale gas, Horizontal well, Stimulated reservoir volume, Finite volume method, 3D numerical simulation of seepage, Sequential solution, Fully implicit solution, Desorbed gas, Gas production ratehttp://www.sciencedirect.com/science/article/pii/S2352854019300683 |
| spellingShingle | Xiaofan Chen Chao Tang Zhimin Du Liandong Tang Jiabao Wei Xu Ma Numerical simulation on multi-stage fractured horizontal wells in shale gas reservoirs based on the finite volume method Natural Gas Industry B |
| title | Numerical simulation on multi-stage fractured horizontal wells in shale gas reservoirs based on the finite volume method |
| title_full | Numerical simulation on multi-stage fractured horizontal wells in shale gas reservoirs based on the finite volume method |
| title_fullStr | Numerical simulation on multi-stage fractured horizontal wells in shale gas reservoirs based on the finite volume method |
| title_full_unstemmed | Numerical simulation on multi-stage fractured horizontal wells in shale gas reservoirs based on the finite volume method |
| title_short | Numerical simulation on multi-stage fractured horizontal wells in shale gas reservoirs based on the finite volume method |
| title_sort | numerical simulation on multi stage fractured horizontal wells in shale gas reservoirs based on the finite volume method |
| url | http://www.sciencedirect.com/science/article/pii/S2352854019300683 |
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