Drilling Technique for Enlarging Borehole in Coalbed Methane Shaft

YUAN Zhi-jian

doi:10.3969/j.issn.1672-7428.2007.07.008

2007 No. 7

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YUAN Zhi-jian. Drilling Technique for Enlarging Borehole in Coalbed Methane Shaft[J]. DRILLING ENGINEERING, 2007, (7): 20-21,24. doi: 10.3969/j.issn.1672-7428.2007.07.008

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YUAN Zhi-jian. Drilling Technique for Enlarging Borehole in Coalbed Methane Shaft[J]. DRILLING ENGINEERING, 2007, (7): 20-21,24. doi: 10.3969/j.issn.1672-7428.2007.07.008