Discussion on Some Problems of RD20 Ⅱ Drill and Construction with DTH Hanuner Drilling Technology

DONG Run-ping; HU Zhong-yi

doi:10.3969/j.issn.1672-7428.2011.12.014

2011 No. 12

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DONG Run-ping, HU Zhong-yi. Discussion on Some Problems of RD20 Ⅱ Drill and Construction with DTH Hanuner Drilling Technology[J]. DRILLING ENGINEERING, 2011, (12): 50-53. doi: 10.3969/j.issn.1672-7428.2011.12.014

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DONG Run-ping, HU Zhong-yi. Discussion on Some Problems of RD20 Ⅱ Drill and Construction with DTH Hanuner Drilling Technology[J]. DRILLING ENGINEERING, 2011, (12): 50-53. doi: 10.3969/j.issn.1672-7428.2011.12.014