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针对松软煤层瓦斯抽采钻孔成孔难、孔壁易坍塌,致使瓦斯有效抽采时间短、浓度低、流量小的现状,提出了松软煤层筛管护孔抽采瓦斯技术,阐述了该技术的基本原理、相关设备及施工工艺。在马堡煤矿15203工作面运输顺槽进行了工业性试验。该技术的应用有效地防止了钻孔塌孔,改善了瓦斯抽采效果,缩短了预抽时间,应用前景良好。
Aiming at the situation that it is difficult for the hole of gas drainage in soft coal seam to be drilled and the hole wall collapses easily and the effective gas extraction time is short, the concentration is low and the flow rate is small, Principle, related equipment and construction technology. Industrial test was carried out in the transportation of 15,203 working face of Marburg Coal Mine. The application of this technology can effectively prevent the borehole collapse hole, improve gas extraction effect, shorten the pre-pumping time, the application prospect is good.