Directional long borehole gas extraction technology for 12506 working face roof of Xiangshan Mine
In response to the short effective period of drilling service on the 12506 working face of Xiangshan Mine,and the instability of gas extraction concentration and volume in drilling,a study has been conducted to replace the original gas con-trol measures with directional long drilling on the roof.By determining the optimal layer and effective control range of bore-holes in the high roof fracture zone for gas extraction,an application plan for roof directional long drilling gas extraction tech-nology is formulated.Based on the on-site construction situation,it is shown that under the gas extraction mode of directional long drilling on the roof,the extraction effect of drilling site 1 is significantly improved,with a concentration range of 4％to 25％,an overall extraction concentration of 12.7％,and a pure extraction volume of 12.29 m3/min.Similarly,the 2nd drilling site has achieved good results,with a single hole extraction concentration between 17％and 22％,an overall extrac-tion concentration of 20.3％,and a net extraction volume of 19.74 m3/min.The concentration of gas in the upper corner of the working face has decreased to 0.4％,effectively curbing gas exceeding limit accidents,providing more effective gas man-agement and control for the mine,and further ensuring the safe operation of the mine with the expected extraction goal.
roofdirectional long boreholegas extractionupper corner
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