The propagation of hydraulic fracture in layered coal seam: a numerical simulation considering the interface thickness based on the distinct element method
The intercalated layer of coal seam plays an important role in the propagation of hydraulic fracturing. To understand the role of the intercalated layer, a composite coal seam model considering the thickness of the intercalated layer was established. Based on the block distinct element method, the e...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2024-01-01
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| Series: | Frontiers in Energy Research |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fenrg.2023.1338428/full |
| _version_ | 1797355323250442240 |
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| author | Hongye Gao Hongye Gao Hongye Gao Baoshan Jia Baoshan Jia Yun Lei Yongxiang Zheng Yongxiang Zheng Bin Shi Haiyang Wei Tongjing Zhang Wei Wang Wei Wang Qinghe Niu Qinghe Niu |
| author_facet | Hongye Gao Hongye Gao Hongye Gao Baoshan Jia Baoshan Jia Yun Lei Yongxiang Zheng Yongxiang Zheng Bin Shi Haiyang Wei Tongjing Zhang Wei Wang Wei Wang Qinghe Niu Qinghe Niu |
| author_sort | Hongye Gao |
| collection | DOAJ |
| description | The intercalated layer of coal seam plays an important role in the propagation of hydraulic fracturing. To understand the role of the intercalated layer, a composite coal seam model considering the thickness of the intercalated layer was established. Based on the block distinct element method, the effects of rock structure (thickness of the coal seam and intercalated layer), rock properties (elastic modulus), and construction parameters (injection rate and fluid viscosity) on the penetration behavior of hydraulic fractures were analyzed. The results show that the intercalated layers influence the fracture deflection and have a hindering effect on fracture propagation. The thickness of the intercalated layer affects the stress on the bedding plane and the front edge of the fractures. On the contrary, the thickness of the coal seam mainly affects the penetration ability of hydraulic fractures and the extent of hydraulic fracture propagation. In addition, the elastic modulus of the intercalated layers and coal seams affects the hindering effect of the intercalated layer. The high injection rates reduce the hindering effect of the intercalated layer. When fracturing with a high-viscosity fluid, fractures are more likely to enter the intercalated layer. However, excessively high viscosity can make it difficult for fractures to penetrate the intercalated layer. This study can provide theoretical guidance for the fracturing of composite coal seams. |
| first_indexed | 2024-03-08T14:09:29Z |
| format | Article |
| id | doaj.art-e6109c674e18498b8faac04123cd634b |
| institution | Directory Open Access Journal |
| issn | 2296-598X |
| language | English |
| last_indexed | 2024-03-08T14:09:29Z |
| publishDate | 2024-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Energy Research |
| spelling | doaj.art-e6109c674e18498b8faac04123cd634b2024-01-15T04:16:04ZengFrontiers Media S.A.Frontiers in Energy Research2296-598X2024-01-011110.3389/fenrg.2023.13384281338428The propagation of hydraulic fracture in layered coal seam: a numerical simulation considering the interface thickness based on the distinct element methodHongye Gao0Hongye Gao1Hongye Gao2Baoshan Jia3Baoshan Jia4Yun Lei5Yongxiang Zheng6Yongxiang Zheng7Bin Shi8Haiyang Wei9Tongjing Zhang10Wei Wang11Wei Wang12Qinghe Niu13Qinghe Niu14College of Safety Science and Engineering, Liaoning Technical University, Fuxin, ChinaKey Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Liaoning Technical University, Huludao, ChinaState Key Laboratory of Coal Mine Safety Technology, Shenyang Research Institute China Coal Technology & Engineering Group Corp, Shenyang, ChinaCollege of Safety Science and Engineering, Liaoning Technical University, Fuxin, ChinaKey Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education, Liaoning Technical University, Huludao, ChinaState Key Laboratory of Coal Mine Safety Technology, Shenyang Research Institute China Coal Technology & Engineering Group Corp, Shenyang, ChinaKey Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, ChinaHebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mine, Shijiazhuang, ChinaDownhole Operation Company, CNPC Xibu Drilling Engineering Co., Ltd., Karamay, ChinaKey Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, ChinaKey Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, ChinaKey Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, ChinaHebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mine, Shijiazhuang, ChinaKey Laboratory of Roads and Railway Engineering Safety Control, Ministry of Education, Shijiazhuang Tiedao University, Shijiazhuang, ChinaHebei Technology and Innovation Center on Safe and Efficient Mining of Metal Mine, Shijiazhuang, ChinaThe intercalated layer of coal seam plays an important role in the propagation of hydraulic fracturing. To understand the role of the intercalated layer, a composite coal seam model considering the thickness of the intercalated layer was established. Based on the block distinct element method, the effects of rock structure (thickness of the coal seam and intercalated layer), rock properties (elastic modulus), and construction parameters (injection rate and fluid viscosity) on the penetration behavior of hydraulic fractures were analyzed. The results show that the intercalated layers influence the fracture deflection and have a hindering effect on fracture propagation. The thickness of the intercalated layer affects the stress on the bedding plane and the front edge of the fractures. On the contrary, the thickness of the coal seam mainly affects the penetration ability of hydraulic fractures and the extent of hydraulic fracture propagation. In addition, the elastic modulus of the intercalated layers and coal seams affects the hindering effect of the intercalated layer. The high injection rates reduce the hindering effect of the intercalated layer. When fracturing with a high-viscosity fluid, fractures are more likely to enter the intercalated layer. However, excessively high viscosity can make it difficult for fractures to penetrate the intercalated layer. This study can provide theoretical guidance for the fracturing of composite coal seams.https://www.frontiersin.org/articles/10.3389/fenrg.2023.1338428/fullhydraulic fracturinglayered coal seamdistinct element methodthicknessintercalated layer |
| spellingShingle | Hongye Gao Hongye Gao Hongye Gao Baoshan Jia Baoshan Jia Yun Lei Yongxiang Zheng Yongxiang Zheng Bin Shi Haiyang Wei Tongjing Zhang Wei Wang Wei Wang Qinghe Niu Qinghe Niu The propagation of hydraulic fracture in layered coal seam: a numerical simulation considering the interface thickness based on the distinct element method Frontiers in Energy Research hydraulic fracturing layered coal seam distinct element method thickness intercalated layer |
| title | The propagation of hydraulic fracture in layered coal seam: a numerical simulation considering the interface thickness based on the distinct element method |
| title_full | The propagation of hydraulic fracture in layered coal seam: a numerical simulation considering the interface thickness based on the distinct element method |
| title_fullStr | The propagation of hydraulic fracture in layered coal seam: a numerical simulation considering the interface thickness based on the distinct element method |
| title_full_unstemmed | The propagation of hydraulic fracture in layered coal seam: a numerical simulation considering the interface thickness based on the distinct element method |
| title_short | The propagation of hydraulic fracture in layered coal seam: a numerical simulation considering the interface thickness based on the distinct element method |
| title_sort | propagation of hydraulic fracture in layered coal seam a numerical simulation considering the interface thickness based on the distinct element method |
| topic | hydraulic fracturing layered coal seam distinct element method thickness intercalated layer |
| url | https://www.frontiersin.org/articles/10.3389/fenrg.2023.1338428/full |
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