穿层钻孔超高压水力割缝技术试验研究

为提高张集矿1煤层瓦斯抽采效果，解决低透气性厚煤层瓦斯抽采率低、瓦斯涌出量大的难题，矿井采用超高压水力割缝卸压增透技术在1415A底抽巷进行了试验应用。通过对割缝钻孔和未割缝钻孔的等效直径、钻孔瓦斯流量、瓦斯抽采量、瓦斯含量下降率等分析表明，采用超高压水力割缝术后，钻孔内煤体的暴露面积大大增加，为瓦斯释放提供了有利空间，同时使煤体充分卸压，改善煤层透气性，大幅度提高瓦斯抽采率，减少了抽采达标时间，解决了厚煤层采掘工作面瓦斯治理的难题。研究为矿区类似条件厚煤层的瓦斯高效治理提供了技术指导。

Experimental study on ultra-high pressure hydraulic slotting technology of through layer borehole

In order to improve the effect of gas extraction in No.1 coal seam of Zhangji Coal Mine and solve the problems of low gas extraction rate and large gas emission in the thick coal seam with low permeability，the ultra-high pressure hydraulic slotting pressure relief and permeability enhancement technology were applied in 1415A bottom extraction roadway.Through the analysis of the equivalent diameter of slotted and uncut holes，gas flow rate，gas extraction volume and gas content reduction rate，and it is shown that after the ultra-high pressure hydraulic slotting operation，the exposed area of the coal body in the hole was greatly increased，which provided a favorable space for gas release，at the same time，it made the coal body fully depressurized，and improved the permeability of the coal seam，greatly improved the gas extraction rate and reduces the pressure.It solved the problem of gas control in thick coal mining face.The research provided technical guidance for gas efficient control of similar thick coal seam in mining area.