Zheng Ren. DISCUSSION TO SOME PROBLEMS ABOUT DRILLING WITH DRAG BIT[J]. COAL GEOLOGY & EXPLORATION, 1993, 21(3): 56-59.
Citation: Zheng Ren. DISCUSSION TO SOME PROBLEMS ABOUT DRILLING WITH DRAG BIT[J]. COAL GEOLOGY & EXPLORATION, 1993, 21(3): 56-59.
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DISCUSSION TO SOME PROBLEMS ABOUT DRILLING WITH DRAG BIT

    Abstract
  • The forces which the knives of a drag bit and drilling pipes suffer when drilling are analysed.The mechanism and the control of“suppression of drilling”are discussed.
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