Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut
Abstract Coal and gas outburst disasters are prone to occur within rock cross‐cut coal uncovering in deep underground coal mines. To reduce the risk of coal and gas burst under rock cross‐cut coal uncovering, a technique of permeability enhancement using hydraulic fracturing sand‐carrying is propose...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2019-10-01
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| Series: | Energy Science & Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1002/ese3.397 |
| _version_ | 1818309971814645760 |
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| author | Yin Shuaifeng Ma Haifeng Cheng Zhiheng Zou Quanle Li Yingming Jia Housheng Zhang Kexue |
| author_facet | Yin Shuaifeng Ma Haifeng Cheng Zhiheng Zou Quanle Li Yingming Jia Housheng Zhang Kexue |
| author_sort | Yin Shuaifeng |
| collection | DOAJ |
| description | Abstract Coal and gas outburst disasters are prone to occur within rock cross‐cut coal uncovering in deep underground coal mines. To reduce the risk of coal and gas burst under rock cross‐cut coal uncovering, a technique of permeability enhancement using hydraulic fracturing sand‐carrying is proposed. Field test was conducted using HF sand‐carrying approach, and the effect of permeability enhancement was investigated. The results show that the evolution of cracks has been subjected three stages: energy slowly increasing and crack initiation, damage localization of coal seam and gradually failure, and crack instability expansion and formation of a complex fracture network system. In addition, it is found that “water‐sand” type injection of high‐pressure fluid carried sand into HF cracks, which creates a support force on crack surface and prevents crack closure. A fully developed fracture network system with high flow conductivity capacity is created and thus increases gas permeability largely. Furthermore, a clearly increasing trend associated with the HF sand‐carrying is found for the treated coal seam area. The permeability coefficient is about 21.5‐30.5 times higher than that from the raw coal seam. A good prevention effect of coal and gas outburst is achieved using HF sand‐carrying method. |
| first_indexed | 2024-12-13T07:38:39Z |
| format | Article |
| id | doaj.art-898d147b32564b9d8925b0ec03761e55 |
| institution | Directory Open Access Journal |
| issn | 2050-0505 |
| language | English |
| last_indexed | 2024-12-13T07:38:39Z |
| publishDate | 2019-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Energy Science & Engineering |
| spelling | doaj.art-898d147b32564b9d8925b0ec03761e552022-12-21T23:55:01ZengWileyEnergy Science & Engineering2050-05052019-10-01751867188110.1002/ese3.397Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cutYin Shuaifeng0Ma Haifeng1Cheng Zhiheng2Zou Quanle3Li Yingming4Jia Housheng5Zhang Kexue6Safety Engineering Center North China University of Science and Technology Beijing ChinaFaculty of Energy and Safety Engineering Key Laboratory of Safety and High‐efficiency Coal Mining Anhui University of Science and Technology Huainan ChinaSafety Engineering Center North China University of Science and Technology Beijing ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control College of Resources and Environmental Science Chongqing University Chongqing ChinaFaculty of Energy and Safety Engineering Key Laboratory of Safety and High‐efficiency Coal Mining Anhui University of Science and Technology Huainan ChinaSchool of Energy Science and Engineering Henan Polytechnic University Jiaozuo ChinaSafety Engineering Center North China University of Science and Technology Beijing ChinaAbstract Coal and gas outburst disasters are prone to occur within rock cross‐cut coal uncovering in deep underground coal mines. To reduce the risk of coal and gas burst under rock cross‐cut coal uncovering, a technique of permeability enhancement using hydraulic fracturing sand‐carrying is proposed. Field test was conducted using HF sand‐carrying approach, and the effect of permeability enhancement was investigated. The results show that the evolution of cracks has been subjected three stages: energy slowly increasing and crack initiation, damage localization of coal seam and gradually failure, and crack instability expansion and formation of a complex fracture network system. In addition, it is found that “water‐sand” type injection of high‐pressure fluid carried sand into HF cracks, which creates a support force on crack surface and prevents crack closure. A fully developed fracture network system with high flow conductivity capacity is created and thus increases gas permeability largely. Furthermore, a clearly increasing trend associated with the HF sand‐carrying is found for the treated coal seam area. The permeability coefficient is about 21.5‐30.5 times higher than that from the raw coal seam. A good prevention effect of coal and gas outburst is achieved using HF sand‐carrying method.https://doi.org/10.1002/ese3.397coal and gas outburstdeep mininghydraulic fracturingpermeability enhancementuncovering coal |
| spellingShingle | Yin Shuaifeng Ma Haifeng Cheng Zhiheng Zou Quanle Li Yingming Jia Housheng Zhang Kexue Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut Energy Science & Engineering coal and gas outburst deep mining hydraulic fracturing permeability enhancement uncovering coal |
| title | Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut |
| title_full | Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut |
| title_fullStr | Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut |
| title_full_unstemmed | Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut |
| title_short | Permeability enhancement mechanism of sand‐carrying hydraulic fracturing in deep mining: A case study of uncovering coal in cross‐cut |
| title_sort | permeability enhancement mechanism of sand carrying hydraulic fracturing in deep mining a case study of uncovering coal in cross cut |
| topic | coal and gas outburst deep mining hydraulic fracturing permeability enhancement uncovering coal |
| url | https://doi.org/10.1002/ese3.397 |
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