井下水力压裂对深部低透煤层瓦斯含量的影响规律研究  被引量:7

Study on the Influence Law of Underground Hydraulic Fracturing on Gas Content of Deep and Low Permeability Coal Seam

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作  者:孙朋[1,2] 许力峰 唐建平 SUN Peng;XU Lifeng;TANG Jianping(State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区:[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出  处:《矿业安全与环保》2019年第6期30-34,共5页Mining Safety & Environmental Protection

基  金:国家科技重大专项(2016ZX05045-004-002,2016ZX05067-004-001);国家自然科学基金面上项目(51874348,51574280)

摘  要:水力压裂是解决深部低透煤层抽采瓦斯困难的主要方法之一,为了进一步提升瓦斯高效抽采及客观评价压裂效果,有必要对压裂后煤层瓦斯含量的影响规律进行研究。在平煤股份十二矿深部低透煤层开展了底抽巷上行穿层钻孔水力压裂增透试验,设计了18个压裂效果考察钻孔,通过取样测定每个考察钻孔的瓦斯含量,详细分析了水力压裂后目标煤层及邻近煤层瓦斯含量的变化规律。研究结果表明:压裂钻孔周围35m范围内目标煤层的瓦斯含量较原始瓦斯含量平均降低了63%,邻近煤层的瓦斯含量较原始瓦斯含量平均降低了27%;沿目标煤层倾向的瓦斯含量平均降幅高于走向。研究结果可为深部低透煤层水力压裂钻孔与抽采钻孔的优化设计提供参考。Hydraulic fracturing is one of the main methods to solve the difficulty of gas extraction in deep and low permeability coal seam. In order to further improve the gas extraction efficiency and evaluate the fracturing effect objectively, it is necessary to study the influence rule of gas content in coal seam after fracturing. The permeability enhanced test of hydraulic fracturing through drilling in bed plate tunnel was carried out in the deep low permeability coal seam of No.12 Coal Mine in Pingdingshan Coal Mining Group Corporation. 18 boreholes were designed to investigate the effect of fracturing, and the gas content of each borehole was measured by sampling. By sampling and measuring the gas content of each borehole, the variation rule of gas content of the target coal seam and the adjacent coal seam after hydraulic fracturing was analyzed in detail. The results show that the gas content of the target coal seam within the range of 35 m around the fracture hole is 63% lower than the original gas content on average, the gas content of the adjacent coal seam is 27% lower than that of the original coal seam on average;the average decrease of gas content along the inclination of the target coal seam is higher than the trend. The research results provide a reference for the optimization design of hydraulic fracturing drilling and extraction drilling in deep and low permeability coal seam.

关 键 词:深部矿井 低透气性煤层 瓦斯含量 水力压裂 效果考察 影响规律 

分 类 号:TD712[矿业工程—矿井通风与安全]

 

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