Permeability enhancement simulation of hydraulic fracturing in underlying coal seams in goaf
Abstract The mining of No.3 coal at Sihe Mine has created a large area of goaf, which has led to a large-scale pressure relief of No.15 coal. It has the advantageous conditions for the development of coalbed methane (CBM). To better achieve the efficient development of CBM, the hydraulic fracturing...
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| Format: | Article |
| Language: | English |
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Springer
2025-07-01
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| Series: | Geomechanics and Geophysics for Geo-Energy and Geo-Resources |
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| Online Access: | https://doi.org/10.1007/s40948-025-01016-3 |
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| author | Kaikai Zhao Chenxi Liu Ye Hua Yanjun Feng Xiaodong Sun Cun Zhang |
| author_facet | Kaikai Zhao Chenxi Liu Ye Hua Yanjun Feng Xiaodong Sun Cun Zhang |
| author_sort | Kaikai Zhao |
| collection | DOAJ |
| description | Abstract The mining of No.3 coal at Sihe Mine has created a large area of goaf, which has led to a large-scale pressure relief of No.15 coal. It has the advantageous conditions for the development of coalbed methane (CBM). To better achieve the efficient development of CBM, the hydraulic fracturing effect and permeability enhancement mechanism of underlying coal seams in Goaf (UCSG) were studied. This study takes the No. 15 coal of Sihe Mine as the research object. Through experiments, the seepage characteristics of coal samples in different areas after hydraulic fracturing along with gas pressure decline were obtained, and a gas pressure decline permeability model was established. A numerical simulation method for hydraulic fracturing of UCSG has been constructed. A large-scale three-dimensional numerical model was established to obtain the stress distribution law of UCSG. Based on this, a small-scale hydrostatic fracturing fluid–structure coupling numerical model of the No.15 coal was constructed. After conducting the hydraulic fracturing simulation, three areas with different degrees of permeability enhancement were delineated: the strongly disturbed area, the weakly disturbed area, and the undisturbed area. Finally, the permeability is updated based on the gas pressure decline permeability model to achieve the simulation of gas extraction. According to the simulation results, the stronger the stress concentration effect of the UCSG, the worse the hydraulic fracturing effect is. The research provides guidance for the hydraulic fracturing and gas extraction of UCSG. |
| format | Article |
| id | doaj-art-0264be18c8604981887c35b7cd2fddfa |
| institution | Kabale University |
| issn | 2363-8419 2363-8427 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Springer |
| record_format | Article |
| series | Geomechanics and Geophysics for Geo-Energy and Geo-Resources |
| spelling | doaj-art-0264be18c8604981887c35b7cd2fddfa2025-08-20T03:46:32ZengSpringerGeomechanics and Geophysics for Geo-Energy and Geo-Resources2363-84192363-84272025-07-0111111510.1007/s40948-025-01016-3Permeability enhancement simulation of hydraulic fracturing in underlying coal seams in goafKaikai Zhao0Chenxi Liu1Ye Hua2Yanjun Feng3Xiaodong Sun4Cun Zhang5Coal Mining Research Institute, China Coal Technology and Engineering Group Co. LtdSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingCoal Mining Research Institute, China Coal Technology and Engineering Group Co. LtdCoal Mining Research Institute, China Coal Technology and Engineering Group Co. LtdSchool of Energy and Mining Engineering, China University of Mining and Technology-BeijingAbstract The mining of No.3 coal at Sihe Mine has created a large area of goaf, which has led to a large-scale pressure relief of No.15 coal. It has the advantageous conditions for the development of coalbed methane (CBM). To better achieve the efficient development of CBM, the hydraulic fracturing effect and permeability enhancement mechanism of underlying coal seams in Goaf (UCSG) were studied. This study takes the No. 15 coal of Sihe Mine as the research object. Through experiments, the seepage characteristics of coal samples in different areas after hydraulic fracturing along with gas pressure decline were obtained, and a gas pressure decline permeability model was established. A numerical simulation method for hydraulic fracturing of UCSG has been constructed. A large-scale three-dimensional numerical model was established to obtain the stress distribution law of UCSG. Based on this, a small-scale hydrostatic fracturing fluid–structure coupling numerical model of the No.15 coal was constructed. After conducting the hydraulic fracturing simulation, three areas with different degrees of permeability enhancement were delineated: the strongly disturbed area, the weakly disturbed area, and the undisturbed area. Finally, the permeability is updated based on the gas pressure decline permeability model to achieve the simulation of gas extraction. According to the simulation results, the stronger the stress concentration effect of the UCSG, the worse the hydraulic fracturing effect is. The research provides guidance for the hydraulic fracturing and gas extraction of UCSG.https://doi.org/10.1007/s40948-025-01016-3Hydraulic fracturingUnderlying coal seamsPermeability modelStress disturbanceNumerical simulation |
| spellingShingle | Kaikai Zhao Chenxi Liu Ye Hua Yanjun Feng Xiaodong Sun Cun Zhang Permeability enhancement simulation of hydraulic fracturing in underlying coal seams in goaf Geomechanics and Geophysics for Geo-Energy and Geo-Resources Hydraulic fracturing Underlying coal seams Permeability model Stress disturbance Numerical simulation |
| title | Permeability enhancement simulation of hydraulic fracturing in underlying coal seams in goaf |
| title_full | Permeability enhancement simulation of hydraulic fracturing in underlying coal seams in goaf |
| title_fullStr | Permeability enhancement simulation of hydraulic fracturing in underlying coal seams in goaf |
| title_full_unstemmed | Permeability enhancement simulation of hydraulic fracturing in underlying coal seams in goaf |
| title_short | Permeability enhancement simulation of hydraulic fracturing in underlying coal seams in goaf |
| title_sort | permeability enhancement simulation of hydraulic fracturing in underlying coal seams in goaf |
| topic | Hydraulic fracturing Underlying coal seams Permeability model Stress disturbance Numerical simulation |
| url | https://doi.org/10.1007/s40948-025-01016-3 |
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