水力压裂技术在煤层增透中的应用研究

Research on the application of hydraulic fracturing technology in coal seam permeability enhancement

为提高煤矿顺层钻孔瓦斯抽采效果,通过对水力压裂机理及影响因素分析,在该矿进行定向水力压裂实验,布置4个压裂钻孔,2个导向钻孔,脉动频率20 Hz。实验结束后,对瓦斯抽采浓度及流量进行观测,与普通顺层钻孔相比,导向钻孔、压裂钻孔的瓦斯抽采浓度和流量均有明显提高,说明水力压裂可以促使煤层渗透率增加、透气性增强,有助于瓦斯预抽。

In order to improve the gas drainage effect of coal mine drilling along the bed,through the analysis of hydraulic fracturing mechanism and influencing factors,a directional hydraulic fracturing experiment was carried out in this mine,and 4 fracturing holes and 2 pilot holes were arranged,and the pulsation frequency was 20 Hz.After the experiment,the gas drainage concentration and flow rate were observed.Compared with the ordinary bedding drilling,the gas drainage concentration and flow rate of the pilot hole and the fracturing hole were significantly improved,indicating that hydraulic fracturing could promote the coal seam.Increased permeability and enhanced air permeability helped gas pre-pumping.