MA Shenqi, WANG Yanhong. DRILLING TOOL PROBLEM CONCERNING NON-BALANCED DRILLING[J]. COAL GEOLOGY & EXPLORATION, 2000, 28(6): 60-62.
Citation: MA Shenqi, WANG Yanhong. DRILLING TOOL PROBLEM CONCERNING NON-BALANCED DRILLING[J]. COAL GEOLOGY & EXPLORATION, 2000, 28(6): 60-62.
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DRILLING TOOL PROBLEM CONCERNING NON-BALANCED DRILLING

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    • Abstract
  • The non-balanced drilling technique is development in recent years and used under different conditions.The drilling tool problems concerning non-balanced technique and some concrete problems in application are discussed in this paper.
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