基于水力致裂的瓦斯驱赶技术研究

Research on gas flooding technology based on hydraulic cracking

煤矿瓦斯安全一直影响着煤矿生产的关键性问题,研究了水力致裂的瓦斯驱赶技术,依据水力致裂裂缝区域确定出应力扰动区、瓦斯驱赶区域、水力致裂的润湿区域;然后把水力致裂技术应用实践中,分析了水力致裂全过程水力压力变化、水力压裂前后各个取样点的瓦斯含量变化以及掘进工作面迎头瓦斯浓度。研究得出,采用深孔水力致裂技术,减少了区域孔的工程量,很少出现吸钻和卡钻的现象,提高了巷道掘进速度。

Coal mine gas safety has always affected the key problems of coal mine production.This paper studied the hydraulic fracturing gas drive technology,and determined the stress disturbance zone,gas flooding zone and hydraulic fracturing wet zone based on the hydraulic fracture zone;in the application practice of hydraulic fracturing technology,the hydraulic pressure change in the whole process of hydraulic fracturing,the change of gas content at each sampling point before and after hydraulic fracturing and the gas concentration in the heading face of the driving face were analyzed.The study showed that the deep hole hydraulic fracturing technology reduces the engineering volume of the regional holes,and the phenomenon of suction and card drilling is rare,and the tunneling speed is improved.