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水力压裂技术是提高低透气性煤层瓦斯抽采效果的一种有效的增透措施。针对煤矿井下低透气性煤层瓦斯抽采浓度低、衰减系数大、抽采时间长且钻孔施工量大等问题,结合现场实际情况,确定压裂所需的仪器设备和工艺参数后,在工作面回风巷实施煤层压裂增透。根据压裂前后的瓦斯抽采参数跟踪记录,两者对比结果表明:对煤层进行压裂增透后,钻孔的最大瓦斯抽采流量和浓度最大可以提高3.65和4.42倍,煤层透气性显著提高,达到了强化瓦斯抽采的目的。
Hydraulic fracturing technology is an effective augmentation measure to improve the gas drainage effect of low permeability coal seam. Aiming at the problems such as low concentration of gas drainage, large attenuation coefficient, long extraction time and large drilling volume in coal seam with low gas permeability, combined with the actual situation in the field, the necessary equipment and process parameters for fracturing are determined, Face air return tunnel implementation of coal seam fracturing and penetration. According to the track record of gas drainage parameters before and after fracturing, the comparison results show that the maximum gas drainage flow rate and concentration in the borehole can be increased by 3.65 and 4.42 times, and the permeability of the coal seam is significantly increased , To achieve the purpose of strengthening gas extraction.