高瓦斯油气伴生矿井高位定向长钻孔合理布设参数研究

Study on Reasonable Layout Parameters of High Directional Long Drilling Hole in High Gas and Oil-gas Associated Mine

针对黄陵矿区高瓦斯油气伴生矿井采空区瓦斯涌出量较大的现状,建立了以含气层分布为主,结合地质地层、采空区裂隙带高度预测、普通高位钻孔布置参数分析等多因素相结合的高瓦斯油气伴生矿井高位定向长钻孔合理布设方法,综合确定黄陵二号煤矿205工作面高位定向长钻孔施工层位为七里镇砂岩、施工高度距煤层顶板20~21 m、水平位置距回风侧11~23 m。以此为基础,在205工作面施工了1组顶板高位定向长钻孔,最大孔深774 m,钻孔平均瓦斯抽采浓度28%、最高83%,工作面上隅角瓦斯由0.81%下降到0.48%,钻孔利用率高达87%。

Aiming at the present situation of large gas emission in high gas and oil-gas associated goaf in Huangling mining area, established reasonable layout method of high directional long drilling hole which take gas bearing formation distribution as the main, combined with geological strata, prediction of fracture zone height in goaf, analysis on the parameters of common high drilling layout, comprehensive determination Huangling No. two coal mine 205＂working face of high directional long drilling construction layer is Qilizhen sandstone, position from the return air side 11-23 m. of high directional long drilling, maximum maximum 83% ,the upper corner gas of utilization rate up to 87%. 20 -21 m away from the roof of coal seam, the horizontal Based on this, in the 205 working face construction one sets hole depth 774 m, gas drainage working face is decreased from concentration average 28%, 0.81% to 0.48%, drilling