On Controlled Hydraulic Seam Cutting Technology of Near-horizontal Coal Seam with High Content and Low Permeability
Based on the technical principle and characteristics of high-pressure water jet slits,in view of the characteristics of"large hardness coefficient,high gas content,poor air permeability and tight pumping time"of the coal seam of Zhujiawan Coal Mine in Yunnan Province,combined with the actual mining deployment and production situation of the mine,the gas treatment and permeability measures of"drilling and cutting integration"of the working face are proposed,and experimental research is carried out in the mining area.Through on-site research,it is shown that the use of"drilling and cutting integration"can effectively improve the cracks of the coal seam,change and reduce the original stress and gas content of the coal seam,increase the gas flow space of the coal seam,and successfully eliminate the outstanding danger of the coal seam.The test data show that the single-hole gas extraction capacity of the coal seam increases by 3.7 times after hydraulic cutting,and the working face extraction time is shortened by half,which successfully alleviates the tension of mine mining succession.The success of this test provides a basis and experience for gas treatment in this mine and similar mines.
permeabilityhigh-pressure water jetdrilling and cutting integrationgas content
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