水力压裂增透技术在煤巷掘进中的应用

针对高瓦斯低透气性突出煤层,若直接采用钻孔抽放瓦斯,则存在抽采效果差、抽放时间长、抽放率不高的问题。为提高低透气性煤层的抽放效率,达到预防瓦斯突出的效果,运用水力压裂增透技术在同华煤矿K1半煤岩巷掘进工作面进行了试验。试验结果表明,采用水力压裂能够增加煤层透气性,提高单孔瓦斯抽采浓度和流量,减少防突施工对掘进工作的影响,提高预抽瓦斯效果,减少掘进面生产期间的安全隐患。使掘进面瓦斯日抽采量增加120%以上、日掘进进度增加80%以上。

Application of Hydraulic fracturing technology on increasing coal tunneling

In the case of high gassy and low air permeable coal seam,if borehole measure is used in directly draining methane,gas drainage effect and time will be poor and long,that is low drainage efficiency.To improve it and achieve a sound effect of preventing gas,an experiment is conducted by using hydraulic fracturing technology for air permeability enhancement at K1 coal tunneling lane in Tonghua Coal Mine.Result of it shows that hydraulic fracturing technology can enhance the air permeability of coal seam,improve single hole gas drainage concentration and flow rate,reduce outburst-prevention construction’s influences on tunneling work,strengthen the measures of gas pre-drainage,and reduce the potential safety hazards of tunneling lane during production period.Furthermore,it makes the daily gas drainage amount and tunneling in working face increased more than 120% and 180% respectively.Ultimately achieved the purpose of production increase.