文章摘要信息 关键词 ： 千米钻孔；卸压圈；负压；瓦斯抽采率 [gap=1096]Keywords : 1 000 m length-drillhole;pressure relief circle;negative pressure;gas drainage efficiency
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“卸压增透”技术是提高松软低透气性煤层瓦斯抽采率的有效途径。
"Pressure relief antireflective" technology is to improve the soft low-permeability coal seam gas extraction rate in an effective way.
提高全液压坑道钻机液压系统的技术水平，对于改善钻机整机性能及提高瓦斯抽采孔的成孔率具有重要意义。
It is significant to improve the hydraulic system for better performance of drilling rig and the higher ratio of finishing gas hole.
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