coal bed methane drilling
coal bed methane drilling
煤层气钻井
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Besides, elaborate technology economy compare about the technics and technology of mining coal bed methane by drilling borehole down and cross the seam is carried out.
此外，本文还对顺层钻孔和穿层钻孔抽采煤层气的工艺技术进行了详尽的技术经济比较。
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