Influences of Different Factors and Sensitivity Analysis of Permeability of Gassy Coal
Influencing factors and sensitivity analysis of coal permeability are significant for reasonably setting coalbed methane (CBM) extraction parameters and increasing CBM output. Seepage tests were conducted on gassy coal using a seepage test system for damaged coal and rock mass under various conditio...
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2025-01-01
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| author | Bo Li Yong Yuan Yunpei Liang Zhenghan Qin |
| author_facet | Bo Li Yong Yuan Yunpei Liang Zhenghan Qin |
| author_sort | Bo Li |
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| description | Influencing factors and sensitivity analysis of coal permeability are significant for reasonably setting coalbed methane (CBM) extraction parameters and increasing CBM output. Seepage tests were conducted on gassy coal using a seepage test system for damaged coal and rock mass under various conditions of axial pressure, confining pressure, and gas pressure. Moreover, the influences of different factors on the permeability of gassy coal and the sensitivity of permeability to these factors were analyzed. Research results show that under the same confining pressure, the relationship between permeability and axial pressure of gassy coal meets the quadratic polynomial function; under the same axial pressure, the permeability changes with the confining pressure as a power function. The permeability of gassy coal is far more sensitive to confining pressure than to axial pressure during axial seepage. Under the same axial pressure and confining pressure (same stress), the permeability of gassy coal reduces at first and then increases in a V-shaped trend with growing gas pressure. There is a turning point in the seepage tests, that is, the critical gas pressure. When the gas pressure is lower than the critical value, the slippage effect plays the leading role in the variation of permeability of the coal; on the contrary, effective stress plays the dominant role. In the non-isobaric deviatoric stress state, the permeability of gassy coal is most sensitive to the confining pressure, followed successively by gas pressure and axial pressure. The research results provide a theoretical basis for precise gas extraction and control in coal seams. |
| format | Article |
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| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
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| spelling | doaj-art-541081e7f9d944b1b815f6382e2e2ad12025-01-24T13:20:54ZengMDPI AGApplied Sciences2076-34172025-01-0115280810.3390/app15020808Influences of Different Factors and Sensitivity Analysis of Permeability of Gassy CoalBo Li0Yong Yuan1Yunpei Liang2Zhenghan Qin3State Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory of Coal Mine Disaster Dynamics and Control, School of Resources and Safety Engineering, Chongqing University, Chongqing 400044, ChinaState Key Laboratory for Fine Exploration and Intelligent Development of Coal Resources, China University of Mining and Technology, Xuzhou 221116, ChinaInfluencing factors and sensitivity analysis of coal permeability are significant for reasonably setting coalbed methane (CBM) extraction parameters and increasing CBM output. Seepage tests were conducted on gassy coal using a seepage test system for damaged coal and rock mass under various conditions of axial pressure, confining pressure, and gas pressure. Moreover, the influences of different factors on the permeability of gassy coal and the sensitivity of permeability to these factors were analyzed. Research results show that under the same confining pressure, the relationship between permeability and axial pressure of gassy coal meets the quadratic polynomial function; under the same axial pressure, the permeability changes with the confining pressure as a power function. The permeability of gassy coal is far more sensitive to confining pressure than to axial pressure during axial seepage. Under the same axial pressure and confining pressure (same stress), the permeability of gassy coal reduces at first and then increases in a V-shaped trend with growing gas pressure. There is a turning point in the seepage tests, that is, the critical gas pressure. When the gas pressure is lower than the critical value, the slippage effect plays the leading role in the variation of permeability of the coal; on the contrary, effective stress plays the dominant role. In the non-isobaric deviatoric stress state, the permeability of gassy coal is most sensitive to the confining pressure, followed successively by gas pressure and axial pressure. The research results provide a theoretical basis for precise gas extraction and control in coal seams.https://www.mdpi.com/2076-3417/15/2/808permeabilitygas seepageinfluencing factors of seepageeffective stresssensitivity |
| spellingShingle | Bo Li Yong Yuan Yunpei Liang Zhenghan Qin Influences of Different Factors and Sensitivity Analysis of Permeability of Gassy Coal Applied Sciences permeability gas seepage influencing factors of seepage effective stress sensitivity |
| title | Influences of Different Factors and Sensitivity Analysis of Permeability of Gassy Coal |
| title_full | Influences of Different Factors and Sensitivity Analysis of Permeability of Gassy Coal |
| title_fullStr | Influences of Different Factors and Sensitivity Analysis of Permeability of Gassy Coal |
| title_full_unstemmed | Influences of Different Factors and Sensitivity Analysis of Permeability of Gassy Coal |
| title_short | Influences of Different Factors and Sensitivity Analysis of Permeability of Gassy Coal |
| title_sort | influences of different factors and sensitivity analysis of permeability of gassy coal |
| topic | permeability gas seepage influencing factors of seepage effective stress sensitivity |
| url | https://www.mdpi.com/2076-3417/15/2/808 |
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