同华煤矿K_1煤层穿层水力压裂技术深化试验

Further Test on Crossing Hydraulic Fracturing Technology for K_1 Coal Seam in Tonghua Mine

在同华煤矿±0 m阶段巷应用水力压裂技术对K1煤层进行穿层水力压裂深化试验,在设定范围布置检验钻孔,应用DGC型瓦斯含量快速测定仪及安装压力表考察压裂前后煤层基本参数变化规律,确定压裂影响范围及瓦斯运移变化规律,优化抽采钻孔布置,并考察压裂后瓦斯抽采效果。与同等条件2125-3运输巷经水力割缝增透相比,3121回风巷掘进条带经高压水力压裂增透后,单个钻场瓦斯抽采平均纯流量由0.063 8 m3/min提高到0.253 8 m3/min,提高297.81%;单个钻孔瓦斯抽采平均纯流量由0.001 7 m^3/min提高到0.007 4 m^3/min,提高335.29%,增透效果良好。

Further test was carried out on the hydraulic fracturing technology across K1 coal seam in ± 0 m level entry in Tonghua Mine, investigation was made on the change of the basic parameters of the coal seam before and after hydraulic fracturing by arranging the inspection holes in the setting range and using DGC gas content rapid measuring instrument and pressure gauges, the influence scope of hydraulic fracturing and the change law of gas migration inspection were determined, the arrangement of drainage holes was optimized, and the gas drainage effect after hydraulic fracturing was examined. As compared with the permeability enhancement of 2125-3 haulage way by hydraulic cutting at the same conditions, the average pure gas drainage volume of a single drilling site increased from 0. 063 8 m3/min to 0. 253 8 m3/min after the permeability enhancement of the drivage strip of 3121 air-return way by high-pressure hydraulic fracturing, increased by 297. 81%;the average pure gas drainage volume of a single hole increased from 0. 001 7 m3/min to 0. 007 4 m3/min, increased by 335. 29%, so the permeability enhancement effect was good.