卸压抽采
destressed gas extraction
relieved drainage
pressure relieved extraction
瓦斯割缝抽采
gas extraction by cutting
瓦斯抽采
methane drainage
gas drainage
mine gas extraction and drainage
gas extraction in the upper corner
gas suction
methane extraction
gas extraction
pull out gas
煤矿瓦斯抽采
coalmine gas extraction and production
煤层气抽采
methane drainage
coalmine methane drainage
立体抽采
three-dimensional drainage
抽采利用
gas extraction and utilization
抽采孔孔距
distance of the gas drainage