Enhanced extraction technology based on"protective seam"in coal seam of directional hydraulic coal cutting
In order to solve the problems of small range,short distance of the drilling covered and poor accuracy of hydraulic coal cutting by through-seam drilling in bottom extraction,Hudi Coal Mine has started from the analysis of the mechanism of preventing outburst of coal by hydraulic cutting,combined with wireless measurement technology of directional drilling and hydraulic coal cutting technology,and carried out the hydraulic coal cutting test of directional drilling in the head-on drilling field of the roadway 13091.The practice shows that the concentration of drilling extraction and the flow rate of 100 meter drilling have both increased after hydraulic coal cutting of directional drilling,the time required to meet the extraction stand-ards has been shortened,and the goal of eliminating outburst has been achieved.The technology has the characteristics of long-distance,precise,all-round outburst suppression,and good economic benefits,and can be widely applied in the regional gas control of outburst mines.
gas controlextra-thin protective seamhydraulic coal cuttingoutburst prevention mechanismextraction effect
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