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美国固本煤炭公司研制了一种移动或水平钻机,该机能钻φ76～102mm、深达610m水平钻孔,并能保持其预定的钻进度。该钻机由两人操作,特别适用于预抽煤层瓦斯、浅层矿藏采油、井下煤层勘探,并被认可用在沼气浓度低于1％的回风巷道。这种钻机在美国3个煤矿共钻了水平孔长约6.4km,并在5年内抽放沼气近2832万M~3,使工作面沼气浓度下降到2‰。该钻机的结构与其它钻孔相比,有3个不同点: 1.钻孔装有一个煤、气、水分离系统的闭合回路,能安全处理未与矿井空气混合过的大量的钻孔沼气; 2.钻机有一钻头导向装置,不仅可使钻头
The United States Gubei Coal has developed a mobile or horizontal drilling machine, the machine can drill φ76 ~ 102mm, depth of 610m horizontal drilling, and to maintain their predetermined drilling progress. The rig is operated by two people and is particularly suitable for pre-pumping seam gas, shallow mineral oil and underground coal seam exploration and is approved for return airways with biogas concentrations below 1%. The rig drills a total of 6.4 km of horizontal holes in three coal mines in the United States and pumped up nearly 28.32 million M 3 of biogas within five years, reducing the biogas concentration to 2 ‰ on the face. The structure of the rig differs from other boreholes in three points: 1. The borehole incorporates a closed loop of coal, gas and water separation system that safely treats large volumes of borehole biogas that is not mixed with mine air ; 2. Drill has a drill guide, not only allows the drill bit