Application of DTH Hammer and Air-cooled Roller Bit Combined Drilling Technology in Large Diameter Pumping Well Crossing Goaf

CHEN Ping-an; LI Yuan-hui

doi:10.3969/j.issn.1672-7428.2016.09.013

2016 No. 9

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CHEN Ping-an, LI Yuan-hui. Application of DTH Hammer and Air-cooled Roller Bit Combined Drilling Technology in Large Diameter Pumping Well Crossing Goaf[J]. DRILLING ENGINEERING, 2016, (9): 61-65. doi: 10.3969/j.issn.1672-7428.2016.09.013

Citation:

CHEN Ping-an, LI Yuan-hui. Application of DTH Hammer and Air-cooled Roller Bit Combined Drilling Technology in Large Diameter Pumping Well Crossing Goaf[J]. DRILLING ENGINEERING, 2016, (9): 61-65. doi: 10.3969/j.issn.1672-7428.2016.09.013