Volume 31 Issue 2
Apr.  2003
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HAO Shi-jun, SHI Zhi-jun, SUN Rong-jun, LIU Wei-dong. Drilling technology of long hole using for discharging gas from coal seams[J]. COAL GEOLOGY & EXPLORATION, 2003, 31(2): 61-62.
Citation: HAO Shi-jun, SHI Zhi-jun, SUN Rong-jun, LIU Wei-dong. Drilling technology of long hole using for discharging gas from coal seams[J]. COAL GEOLOGY & EXPLORATION, 2003, 31(2): 61-62.
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Drilling technology of long hole using for discharging gas from coal seams

  • Xi'an Branch, CCRI, Xi'an 710054, China

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  • Received Date: July 02, 2002
  • Available Online: March 21, 2023
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  • It is introduced that the test of long drilling hole using for discharging gas from coal seams. Executed 3 hole using directional drilling technology,one drilling hole depth is up to 509.03 m,which is the longest drilling hole in coal seams,average sheet drilling speed is up to 24.4 m/h.Discharge of all these hole is up to 2.0~2.5 m3/min.
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