Volume 45 Issue 6
Dec.  2017
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LEI Wenjie, LEI Jianwei, YANG Hongmin, WANG Zhaofeng. Borehole gas pressure build-up to evaluate the permeability of coal seam[J]. COAL GEOLOGY & EXPLORATION, 2017, 45(6): 28-33. DOI: 10.3969/j.issn.1001-1986.2017.06.005
Citation: LEI Wenjie, LEI Jianwei, YANG Hongmin, WANG Zhaofeng. Borehole gas pressure build-up to evaluate the permeability of coal seam[J]. COAL GEOLOGY & EXPLORATION, 2017, 45(6): 28-33. DOI: 10.3969/j.issn.1001-1986.2017.06.005
shu

Borehole gas pressure build-up to evaluate the permeability of coal seam

  • 1. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;

  • 2. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, China;

  • 3. Collaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic Region, Henan Province, Jiaozuo 454000, China

Funds: 

National Natural Science Foundation of China(51374094)

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  • Received Date: November 15, 2016
  • Published Date: December 24, 2017
    Graphical Abstract
    • Abstract
  • The permeability of coalbed benefits the right evaluation of gas drainage capability, which could be used to select the suitable technique to increase the permeability and drainage effect. The permeability of coalbed is evaluated referring to the theory and experience of gas pressure build-up in the well testing. The gas flow model appropriate to the underground coal mine has been set up. The starting point of radial flow in the pressure build-up curve could be designated rationally using the double and half logarithmic pressure build-up curves with the analytic method of half logarithmic straight line. Therefore the slope of the interim radial flow section and the permeability of the coalbed could be determined accurately. After the verification and comparison with the result of in-situ examples by the radial flow method, the relative error of the five examples was between 13% and 36.6% and the average was lower than 24.62%. So the permeability of coalbed by the borehole gas pressure build-up curve is practical.
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    • References (14)
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