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针对高瓦斯低透气性煤层瓦斯抽采钻孔施工量大、效率低等问题,研究了水力压裂技术的破煤理论及高压水对煤层的卸压增透理论,提出水力压裂强化抽采瓦斯的措施,以岩土工程数值模拟软件FLAC3D对煤层进行水力压裂数值模拟,得到煤层水力压裂过程中裂纹扩展规律,确定了水力压裂现场试验的工艺参数、压裂装备及抽采系统,完成封孔及压裂试验。
In view of the large amount of construction and low efficiency of gas drainage drilling in high gas and low permeability coal seam, the coal breaking theory of hydraulic fracturing technology and the theory of pressure relief and penetration enhancement by high pressure water on coal seam are studied. Hydraulic fracturing enhanced extraction Gas measures to geotechnical numerical simulation software FLAC3D hydraulic fracturing numerical simulation of the coal seam to get the law of crack propagation in the hydraulic fracturing process of the coal seam to determine the hydraulic fracturing field test process parameters, fracturing equipment and extraction system , To complete sealing and fracturing test.