Research on Optimization of Large Flow Hydraulic Punching Process in Zhaozhuang Mine

Taking hydraulic punching test of Zhaozhuang Mine as engineering background, by comparing the field application effects different processes, relationship between coal moisture content around borehole blockage and gas extraction effect was monitored analyzed. The following conclusions were drawn: occurrence result comprehensive action slag particle size discharge capacity return water. Blocking led to accumulation a large amount high-pressure water in borehole, which compressed infiltrated surrounding body reduced efficiency borehole. Under condition same produced punching, methods great difference influence radius punching. flow three-stage coal-breaking system developed according mechanism can effectively reduce slag, increase flow, avoid blockage, improve