Experimental Study on Permeability Enhancement of Hydraulic Fracturing with Sand in Strong Outburst Coal Seam

Based on the gas geological conditions of 17102(3) working face in Pansan Coal Mine, using theoretical analysis, engineering practice and other methods, the hydraulic fracturing sand permeability technology and technology are studied. Through the comparative analysis of permeability enhancement and drainage effect between fractured area and non fractured area, it can be seen that after sand fracturing, the permeability coefficient of coal seam is increased by 13.31 times, the average 100 hole purity is increased by 2.3 times, the time of reaching the standard of drainage is reduced by 26 days, and the hydraulic fracturing sand permeability enhancement technology ensures the safe and efficient mining of working face.