Research and application of geological modeling based on gas extrac-tion directional drilling
Aiming at the problem of low utilization of geological information revealed by gas drainage directional drilling,taking No.3 drilling field in No.3 mining area of Shanxi Tiandi Wangpo Coal Mine as the research object,the geological modeling research and model application analysis based on gas drainage directional drilling were carried out.The high-precision geological model and gas content model of the drilling area are constructed by combining the basic information of the mine,the test information of the sealed coring gas content of the borehole,the directional drilling trajectory and the exposed lithology information.According to the geological model and gas content model,the drilling construction quality,coal seam spatial fluctuation,roadway expected profile and residual gas content in drilling field are analyzed.The results show that:1)The trajectory of No.6 borehole is basically in the middle of the coal seam,and the deviation of the borehole from the central axis of the coal seam is 0.31 m,and the construction quality is good.2)The drilling area as a whole is a wide and gentle monoclinic structure,and there is a small syncline structure in the local area;3)After nearly 500 days of extraction,the residual gas content of No.3 drilling field is 2 507 306.05 m3,and the average gas concentration is expected to be 4.91 m3/t.
geological modelinggas extraction directional drillingmodel analysisTIM-3Dresidual gas content calculation
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