Study on directional hydraulic fracturing of prefabricated fissures in top coal
In order to improve the cavity and working surface operating environment of thick hard top coal, the top coal prefabricated fissure hydraulic fracturing technology was proposed.The basic principle of directional fracturing was studied and the stress models of borehole and fissures were analyzed then...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Emergency Management Press
2018-12-01
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| Series: | 矿业科学学报 |
| Subjects: | |
| Online Access: | http://kykxxb.cumtb.edu.cn/article/id/184 |
| _version_ | 1811179825817190400 |
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| author | Lü Huayong Liu Fei Li Lianghui Cheng Zhanbo |
| author_facet | Lü Huayong Liu Fei Li Lianghui Cheng Zhanbo |
| author_sort | Lü Huayong |
| collection | DOAJ |
| description | In order to improve the cavity and working surface operating environment of thick hard top coal, the top coal prefabricated fissure hydraulic fracturing technology was proposed.The basic principle of directional fracturing was studied and the stress models of borehole and fissures were analyzed then the cracking conditions, the propagation process and its morphology of fissures were obtained.The RFPA<sup>2D</sup>-Flow percolation software was used to study the directional fracturing of top coal:In the initial stage of fracturing, the high stress concentration occurs at the tip of the fissures, a relief zone forms in the borehole and the both side of directional fissure and it gradually increases with water injection pressure.Meanwhile, the high water pressure zone forms around drilling and directional cracks and it gradually increases with water injection pressure.In the early stage of fissures, the shear failure occurred in the coal body, and a large number of tensile damage occurred in the later stage of fracturing.When the orientation crack angle <i>α</i> is between 0°~60°, cracks appear and extend, then change direction.When the inclination angle <i>α</i> is 75ånd 90°, the fissures extends along the maximum horizontal principal stress direction. |
| first_indexed | 2024-04-11T06:41:07Z |
| format | Article |
| id | doaj.art-182163a2bf5c46de8e5e270cc6538751 |
| institution | Directory Open Access Journal |
| issn | 2096-2193 |
| language | English |
| last_indexed | 2024-04-11T06:41:07Z |
| publishDate | 2018-12-01 |
| publisher | Emergency Management Press |
| record_format | Article |
| series | 矿业科学学报 |
| spelling | doaj.art-182163a2bf5c46de8e5e270cc65387512022-12-22T04:39:31ZengEmergency Management Press矿业科学学报2096-21932018-12-013655356010.19606/j.cnki.jmst.2018.06.00620180606Study on directional hydraulic fracturing of prefabricated fissures in top coalLü Huayong0Liu Fei1Li Lianghui2Cheng Zhanbo3College of Resource and Safety Engineering, China University of Mining and Technology, Beijing 100083, ChinaCollege of Resource and Safety Engineering, China University of Mining and Technology, Beijing 100083, ChinaCollege of Resource and Safety Engineering, China University of Mining and Technology, Beijing 100083, ChinaSchool of Engineering, University of Warwick, Coventry, CV47AL, United KingdomIn order to improve the cavity and working surface operating environment of thick hard top coal, the top coal prefabricated fissure hydraulic fracturing technology was proposed.The basic principle of directional fracturing was studied and the stress models of borehole and fissures were analyzed then the cracking conditions, the propagation process and its morphology of fissures were obtained.The RFPA<sup>2D</sup>-Flow percolation software was used to study the directional fracturing of top coal:In the initial stage of fracturing, the high stress concentration occurs at the tip of the fissures, a relief zone forms in the borehole and the both side of directional fissure and it gradually increases with water injection pressure.Meanwhile, the high water pressure zone forms around drilling and directional cracks and it gradually increases with water injection pressure.In the early stage of fissures, the shear failure occurred in the coal body, and a large number of tensile damage occurred in the later stage of fracturing.When the orientation crack angle <i>α</i> is between 0°~60°, cracks appear and extend, then change direction.When the inclination angle <i>α</i> is 75ånd 90°, the fissures extends along the maximum horizontal principal stress direction.http://kykxxb.cumtb.edu.cn/article/id/184thick hard top coalprefabricated fissuresdirectional hydraulic fracturingfissures propagation |
| spellingShingle | Lü Huayong Liu Fei Li Lianghui Cheng Zhanbo Study on directional hydraulic fracturing of prefabricated fissures in top coal 矿业科学学报 thick hard top coal prefabricated fissures directional hydraulic fracturing fissures propagation |
| title | Study on directional hydraulic fracturing of prefabricated fissures in top coal |
| title_full | Study on directional hydraulic fracturing of prefabricated fissures in top coal |
| title_fullStr | Study on directional hydraulic fracturing of prefabricated fissures in top coal |
| title_full_unstemmed | Study on directional hydraulic fracturing of prefabricated fissures in top coal |
| title_short | Study on directional hydraulic fracturing of prefabricated fissures in top coal |
| title_sort | study on directional hydraulic fracturing of prefabricated fissures in top coal |
| topic | thick hard top coal prefabricated fissures directional hydraulic fracturing fissures propagation |
| url | http://kykxxb.cumtb.edu.cn/article/id/184 |
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