基于多场耦合效应的水力压裂强化瓦斯抽采机制及应用研究

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关键词：水力压裂；瓦斯抽采；数值模拟；损伤演化；渗透率

中图分类号：TD712 文献标志码：A 文章编号：1003-5168（2025）21-0041-08

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.21.008

Abstract： [Purposes] This paper aims to enhance gas extraction efficiency and ensure mine safety production.[Methods] A mathematical model comprehensively considering coal seam heterogeneity and multi-field coupling effects was proposed and employed. Numerical simulations and field tests were conducted to investigate coal seam damage evolution，fracture propagation，and gas migration behavior duringhydraulic fracturing.[Findings] The results indicate that hydraulic fracturing can significantly expand the fracture damage zone. At fracturing durations of 5，10，15，and 2O minutes，the total lengths of the fracture damage zone reached 5.2 m，6.4 m，8.4 m，and 11.4 m，respectively，with the coal seam permeability increasing up to 15O times its initial value.Post-fracturing，the gas pressure in boreholes remained consistently lower than that in conventional extraction，while the gas extraction rate remained consistently higher.Field data further confirmed that the average gas concentration reached 58.52% ，approximately 97% higher than conventional extraction，and the average gas flow rate was 87.64m3/d ，approximately 136% higher. [Conclusions] The research demonstrates that hydraulic fracturing technology holds significant application value in enhancing gas extraction.

Keywords： hydraulic fracturing; gas extraction; numerical simulation; damage evolution; permeability

0 引言

煤矿瓦斯灾害是影响煤矿安全生产的主要因素之一，其有效控制对于保障矿工生命安全和提高煤矿生产效率具有重要意义[1]。（剩余7949字）