超高压水射流割压联合技术试验分析OA

This article focuses on the advantages and disadvantages of hydraulic cutting and hydraulic fracturing pressure re-lief and permeability enhancement technology,and proposes the combined use of hydraulic cutting and hydraulic fracturing technology for pressure relief and permeability enhancement in coal seams.The principle and process technology of com-bined pressure relief and permeability enhancement are analyzed,and on-site experiments are conducted.The results show that using cutting and pressure combined pressure relief and permeability enhancement technology for interlayer drilling can increase the permeability range along the coal seam direction to 55.4～57.1 m,and along the coal seam inclined direction to 52.3～58.6 m;The permeability coefficient of the coal seam is 26 times that of the original coal body,and the permeabil-ity of the coal seam has significantly improved;The average concentration of gas extraction in cross layer boreholes is 34.9％,and the extraction concentration is stable,significantly higher than that in ordinary extraction boreholes;The average pure gas extraction volume is 0.037 5 m3/min,which is 3.47 times that of ordinary boreholes.Under the same drilling ar-rangement,the time for achieving the extraction standard can be reduced by 55％,and the total time investment can be re-duced by 31.8％.This provides a basis for application of cutting and fracturing combined pressure relief and permeability enhancement technology.