以工程实验为基础,结合屯兰矿现有瓦斯抽放中封孔工艺,主要针对封孔长度,通过理论分析,确定合理的封孔长度。
Based on engineering experience and combined with presently hole-sealed technology of gas drainage used in Tunlan mine, the reasonable hole-sealed length was determined by theoretical analysis.
针对煤层钻孔抽放瓦斯后煤层孔隙裂隙发育致使瓦斯浓度下降,钻孔有效抽放期缩短的技术难题,首次提出二次封孔方法。
Gas concentrations drop, and the effective gas drainage period of holes is shortened, because pores and cracks in the coal seam become completely developed after gas drainage.
高压水射流径向水平孔钻进技术是水平孔施工技术之一,它是在垂直瓦斯抽放或煤层气勘探钻孔布置机械或水力扩孔装置,对准选定的煤层部位进行扩孔。
As one of radial horizontal drilling techniques, high pressure water jet drilling technology is capable of using mechanical or water jet apparatus to make a cavity at the selected coal seam.
应用推荐