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Research on Technology and Equipment of Controlled Directional Borehole for Drawing out of Gas from Coal Mine
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TD712.6

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    Abstract:

    The main equipment, drilling tools, instrument, borehole assembly and drilling parameters for drilling controlled directional gas drawing out hole are introduced. The effects of this technology are explained through several engineering cases.

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History
  • Received:September 09,2002
  • Revised:September 09,2002
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