LI Shi-min, GUO Ke-qin. THE RESEARCH OF REVERSE CIRCULATION DOWNHOLE DRILLING WITH DOUBLE-TUBE ROD[J]. COAL GEOLOGY & EXPLORATION, 1991, 19(2): 56-58,71,72.
Citation: LI Shi-min, GUO Ke-qin. THE RESEARCH OF REVERSE CIRCULATION DOWNHOLE DRILLING WITH DOUBLE-TUBE ROD[J]. COAL GEOLOGY & EXPLORATION, 1991, 19(2): 56-58,71,72.
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THE RESEARCH OF REVERSE CIRCULATION DOWNHOLE DRILLING WITH DOUBLE-TUBE ROD

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  • In this paper, the authors described the self-de-signed double-tube rod and other necessary accessories available to coal geological exploration for the field working team, and showed the testing results of the reverse circulation downhole drilling in coalfields.
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