Investigation and research on technical parameters of hydraulic fracturing in deep mine

In order to accurately enhance the permeability of coal seam in mine mining, increase the extraction capacity of gas drilling, reduce the blank area of gas extraction, and improve the efficiency of gas extraction in mine coal seam, the technical parameters of hydraulic fracturing and permeability enhancement are optimized as the core. Through theoretical analysis and field application, the effective fracturing radius and complete fracturing technology of hydraulic fracturing are systematically studied and verified in engineering practice. Based on the geological conditions of the mine, a hydraulic fracturing research model is constructed. The key parameters such as single-hole water injection, pump group pressure and effective fracturing radius are studied. The field test is carried out in No.15 coal seam of Baoan Coal Mine. The field applicability of the hydraulic fracturing and permeability enhancement process is verified, and the technical indexes and test parameters of the complete fracturing process suitable for the test mine are proposed. The test results show that the hydraulic fracturing technology can effectively solve the bottleneck of gas control technology in outburst and high gas mines. In the field, the water content of coal samples with different fracturing ranges is tested by “cross-crossing method”. It is concluded that the effective fracturing radius in No.15 coal seam of Baoan Coal Mine is 35 meters after hydraulic fracturing. At the same time, through the statistical analysis of field data, it is known that the gas extraction volume of No.15 coal seam in Baoan Coal Mine after hydraulic fracturing is 2.2 times higher than that in the past, and the gas extraction concentration of single hole is 1.6 times that of traditional conventional drilling. The application of mine engineering shows that the efficient hydraulic fracturing technology can effectively shorten the extraction time and improve the concentration of gas extraction. This result effectively solves the problem of efficient permeability improvement and extraction of coal seams in outburst and high gas mines. It provides theoretical support and technical paradigm for efficient permeability improvement and accurate gas extraction in deep mine coal seams. It has popularization and application value in similar mine gas disaster management work, and has important practical significance for realizing safe and efficient mining in mines.