Optimization design of stress relief coalbed methane surface well in a high-gas mine
Coalbed methane drainage through surface wells has become increasingly important in high-gas mines. Surface wells are prone to different types of deformations and failures owing to mining-induced effects. In this paper, a displacement and deformation model was established for the overlying strata. T...
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Frontiers Media S.A.
2024-12-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1492024/full |
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| author | Junhui Fu Guangcai Wen Bichuan Zhang Haitao Sun Rifu Li Jiaqi Liu |
| author_facet | Junhui Fu Guangcai Wen Bichuan Zhang Haitao Sun Rifu Li Jiaqi Liu |
| author_sort | Junhui Fu |
| collection | DOAJ |
| description | Coalbed methane drainage through surface wells has become increasingly important in high-gas mines. Surface wells are prone to different types of deformations and failures owing to mining-induced effects. In this paper, a displacement and deformation model was established for the overlying strata. Three forms of deformation and failure of the surface well casing was proposed, namely shearing, stretching, and uneven extrusion. Moreover, the mathematical model functions for the S-type shear deformation, delamination tensile deformation, and non-uniform extrusion of the surface well were established. In the Shanxi Coal Group Yue Cheng Mine, coalbed methane drainage at the surface well was conducted on the mining-affected area to achieve good effects. The YCCD-04 well without a local protective device was deformed and damaged, and the dynamic deformation and failure of the surface well was detected using a well imager. The YCCD-02 surface well with a local protective device showed good mining and gas drainage, which verified the effectiveness of the local protective device; the coalbed methane drainage time of this surface well was 35 months, and the cumulative coalbed methane drainage volume extracted was 1.3 × 107 m3. Simultaneously, the problem of gas control in the working face was solved, thereby ensuring the safety of coal mining and achieving good social as well as economic benefits. |
| format | Article |
| id | doaj-art-4aa4519169a640e08db63a95b8660f47 |
| institution | OA Journals |
| issn | 2296-6463 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj-art-4aa4519169a640e08db63a95b8660f472025-08-20T01:58:04ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632024-12-011210.3389/feart.2024.14920241492024Optimization design of stress relief coalbed methane surface well in a high-gas mineJunhui Fu0Guangcai Wen1Bichuan Zhang2Haitao Sun3Rifu Li4Jiaqi Liu5Gas Research Branch, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing, ChinaGas Research Branch, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing, ChinaKey-Laboratory of In-Situ Properties-Modified Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, ChinaGas Research Branch, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing, ChinaGas Research Branch, China Coal Technology Engineering Group Chongqing Research Institute, Chongqing, ChinaKey-Laboratory of In-Situ Properties-Modified Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan, ChinaCoalbed methane drainage through surface wells has become increasingly important in high-gas mines. Surface wells are prone to different types of deformations and failures owing to mining-induced effects. In this paper, a displacement and deformation model was established for the overlying strata. Three forms of deformation and failure of the surface well casing was proposed, namely shearing, stretching, and uneven extrusion. Moreover, the mathematical model functions for the S-type shear deformation, delamination tensile deformation, and non-uniform extrusion of the surface well were established. In the Shanxi Coal Group Yue Cheng Mine, coalbed methane drainage at the surface well was conducted on the mining-affected area to achieve good effects. The YCCD-04 well without a local protective device was deformed and damaged, and the dynamic deformation and failure of the surface well was detected using a well imager. The YCCD-02 surface well with a local protective device showed good mining and gas drainage, which verified the effectiveness of the local protective device; the coalbed methane drainage time of this surface well was 35 months, and the cumulative coalbed methane drainage volume extracted was 1.3 × 107 m3. Simultaneously, the problem of gas control in the working face was solved, thereby ensuring the safety of coal mining and achieving good social as well as economic benefits.https://www.frontiersin.org/articles/10.3389/feart.2024.1492024/fullsurface well deformationcoalbed methane drainageoverlying strata movementsafety protectionsurface well structure |
| spellingShingle | Junhui Fu Guangcai Wen Bichuan Zhang Haitao Sun Rifu Li Jiaqi Liu Optimization design of stress relief coalbed methane surface well in a high-gas mine Frontiers in Earth Science surface well deformation coalbed methane drainage overlying strata movement safety protection surface well structure |
| title | Optimization design of stress relief coalbed methane surface well in a high-gas mine |
| title_full | Optimization design of stress relief coalbed methane surface well in a high-gas mine |
| title_fullStr | Optimization design of stress relief coalbed methane surface well in a high-gas mine |
| title_full_unstemmed | Optimization design of stress relief coalbed methane surface well in a high-gas mine |
| title_short | Optimization design of stress relief coalbed methane surface well in a high-gas mine |
| title_sort | optimization design of stress relief coalbed methane surface well in a high gas mine |
| topic | surface well deformation coalbed methane drainage overlying strata movement safety protection surface well structure |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1492024/full |
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