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针对珲春矿区赋存的煤层具有低煤阶、透气性好和高瓦斯的特点,开展了水力压裂技术工业试验,对比分析了压裂区域内外高位钻孔瓦斯抽采浓度及本煤层预抽钻孔压裂前、后抽采参数、工作面瓦斯涌出量和降尘效果。试验结果表明:压裂区域内高位钻孔抽采瓦斯浓度较压裂区外平均提高2.65倍;压裂后本煤层预抽钻孔瓦斯抽采浓度较压裂前平均提高1.83倍,流量平均提高39倍;回采工作面的瓦斯涌出量由压裂区域外的23 m~3/t降低到第1阶段压裂区域的9.82m~3/t和第2阶段压裂区域的7.51 m~3/t;压裂影响半径达20~34 m,本煤层预抽钻孔间距也大大增加。
In view of the characteristics of coal seam with low coal rank, good gas permeability and high gas content in Hunchun mining area, industrial tests of hydraulic fracturing technology were carried out. The gas drainage concentration of high-level boreholes inside and outside of fracturing area and pre-drainage drilling Hole before and after the drainage parameters, face gas emission and dust effect. The results show that the gas concentration in high borehole in the fracturing area is 2.65 times higher than that outside the fracturing zone. The gas drainage ratio of pre-pumping boreholes in the coal seam after fracturing is 1.83 times higher than that before fracturing, and the average flow rate is increased 39 times. The gas emission from the working face decreased from 23 m 3 / t outside the fracturing zone to 9.82 m 3 / t in the first stage fracturing zone and 7.51 m 3 to the second stage fracturing zone / t; fracturing impact radius of 20 ~ 34 m, the pre-pumping borehole spacing is also greatly increased.