Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal
Hydraulic fracturing and premining gas drainage are important to safe mining and coalbed methane extraction. These technical processes cause the redistribution of in-situ stress and the regional variation of moisture contents within the affected zone. Therefore, we investigated the coupled effect of...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2020/8837758 |
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| _version_ | 1832553512009990144 |
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| author | Junhui Wang Zhijun Wan Yi Wang Zhixiang Liu Sifei Liu Hongwei Zhang Qiuyan Pei |
| author_facet | Junhui Wang Zhijun Wan Yi Wang Zhixiang Liu Sifei Liu Hongwei Zhang Qiuyan Pei |
| author_sort | Junhui Wang |
| collection | DOAJ |
| description | Hydraulic fracturing and premining gas drainage are important to safe mining and coalbed methane extraction. These technical processes cause the redistribution of in-situ stress and the regional variation of moisture contents within the affected zone. Therefore, we investigated the coupled effect of variable stresses (from 9 MPa to 27 MPa) and moisture contents (from 0.22% to 4.00%) on the permeability evolution of gas-saturated raw coal. The results show that (1) the relationship between the mean effective stress and the permeability can be described by a power function according to the permeability evolution model of the porous matrix established in this study. Besides, the influence mechanisms of moisture on fitting coefficients in the function were analyzed. (2) The permeability decreases with the increase of in-situ stress (e.g., confining pressure or volumetric stress) in a negative exponential manner. (3) The curves of permeability variations with moisture content are not always linear, and the permeability is more sensitive to the moisture content than the volumetric stress in the test range. Moreover, the sensitivity of permeability varies in different regions. These results would be beneficial for permeability prediction and surface well parameters design. |
| format | Article |
| id | doaj-art-fa75e57a185b4447b46975515c238e2f |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-fa75e57a185b4447b46975515c238e2f2025-02-03T05:53:52ZengWileyGeofluids1468-81151468-81232020-01-01202010.1155/2020/88377588837758Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw CoalJunhui Wang0Zhijun Wan1Yi Wang2Zhixiang Liu3Sifei Liu4Hongwei Zhang5Qiuyan Pei6Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China; School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaKey Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China; School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaCollege of Safety and Emergency Management Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, ChinaPlanning and Research Institute, Norinco Group, Beijing 100053, ChinaKey Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China; School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, ChinaUniversity of Science and Technology of China, Hefei, Anhui 230031, ChinaHydraulic fracturing and premining gas drainage are important to safe mining and coalbed methane extraction. These technical processes cause the redistribution of in-situ stress and the regional variation of moisture contents within the affected zone. Therefore, we investigated the coupled effect of variable stresses (from 9 MPa to 27 MPa) and moisture contents (from 0.22% to 4.00%) on the permeability evolution of gas-saturated raw coal. The results show that (1) the relationship between the mean effective stress and the permeability can be described by a power function according to the permeability evolution model of the porous matrix established in this study. Besides, the influence mechanisms of moisture on fitting coefficients in the function were analyzed. (2) The permeability decreases with the increase of in-situ stress (e.g., confining pressure or volumetric stress) in a negative exponential manner. (3) The curves of permeability variations with moisture content are not always linear, and the permeability is more sensitive to the moisture content than the volumetric stress in the test range. Moreover, the sensitivity of permeability varies in different regions. These results would be beneficial for permeability prediction and surface well parameters design.http://dx.doi.org/10.1155/2020/8837758 |
| spellingShingle | Junhui Wang Zhijun Wan Yi Wang Zhixiang Liu Sifei Liu Hongwei Zhang Qiuyan Pei Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal Geofluids |
| title | Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal |
| title_full | Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal |
| title_fullStr | Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal |
| title_full_unstemmed | Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal |
| title_short | Effect of Stress and Moisture Content on Permeability of Gas-Saturated Raw Coal |
| title_sort | effect of stress and moisture content on permeability of gas saturated raw coal |
| url | http://dx.doi.org/10.1155/2020/8837758 |
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