High Level Directional Long Borehole Gas Extraction Technology in Chengzhuang Coal Mine
In order to effectively solve the problem of excessive gas emission in the mining area and upper corner,the 101 mining area of a certain mine in Shanxi Province was taken as the research object.The ZYWL-6000DS directional drilling rig was used for high-level directional drilling,with a maximum hole depth of 600 m.According to the principle of"O"ring and on-site conditions,the layout height of high-level drilling holes has been optimized.An analysis was conducted on the gas extraction monitoring results of the high-level directional drilling hole,and it was found that the drilling hole has advantages such as long service life and good gas extraction effect.The pure gas extraction volume of a single hole can reach 17.9 to 18.2 cubic meters per minute.With the advancement of the mining face,the gas content in the upper corner has decreased to 0.2%to 0.4%,indicating that under high-level drilling,the gas extraction effect is obvious,providing a strong guarantee for the smooth progress of mining work.
Gas extractionHigh-level directional boreholeUpper corner
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