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The correlation between crushed coal porosity and permeability under various methane pressure gradients: a case study using Jincheng anthracite

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Listed:
  • Zhen Li
  • Guorui Feng
  • Haina Jiang
  • Shengyong Hu
  • Jiaqing Cui
  • Cheng Song
  • Qiang Gao
  • Tingye Qi
  • Xiangqian Guo
  • Chao Li
  • Lixun Kang

Abstract

As a greenhouse gas (GHG), methane (CH4) emitted from underground mines contributes 17% to total anthropogenic greenhouse gas emissions. Gas drainage is the main measure to resolve this problem, and knowledge of methane flow in surrounding coal and rocks greatly influences our thinking and handling strategies for reducing CH4 emissions. However, due to the lack of matched testing systems, current studies are generally confined to considering methane flow properties in porous and fractured coal and rocks, whereas methane flow behaviors in crushed coal have not been extensively studied and understood yet. In this study, the relationships between crushed coal porosity and permeability under various methane pressures are investigated using a self‐designed gas permeation testing system, and continuous measurements of methane pressure and flow rate have been conducted. The results show that the permeability properties of crushed coal are closely related to the coal porosity, methane pressure, and axial stress. Darcy flow transfers to slip flow in crushed coal in the latter stage of coal‐mine methane drainage in crushed coal, and the permeability of crushed coal has a magnitude of 10−12–10−11 m2, which is rather larger than that of porous and fractured coals. The pseudo‐threshold pressure gradient (TPG) decreases with the growth of porosity, and it is rather smaller than that of lower permeability reservoirs (LPR). With an increase in methane pressure, the permeability of crushed coal presents a logarithmic growth trend; by contrast, it displays an exponential growth trend with an increase in porosity. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

Suggested Citation

  • Zhen Li & Guorui Feng & Haina Jiang & Shengyong Hu & Jiaqing Cui & Cheng Song & Qiang Gao & Tingye Qi & Xiangqian Guo & Chao Li & Lixun Kang, 2018. "The correlation between crushed coal porosity and permeability under various methane pressure gradients: a case study using Jincheng anthracite," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 8(3), pages 493-509, June.
  • Handle: RePEc:wly:greenh:v:8:y:2018:i:3:p:493-509
    DOI: 10.1002/ghg.1757
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    References listed on IDEAS

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    1. Dan Ma & Qiang Li & Matthew R. Hall & Yu Wu, 2017. "Experimental Investigation of Stress Rate and Grain Size on Gas Seepage Characteristics of Granular Coal," Energies, MDPI, vol. 10(4), pages 1-15, April.
    2. Ting Liu & Baiquan Lin & Quanle Zou & Chuanjie Zhu, 2016. "Microscopic mechanism for enhanced coal bed methane recovery and outburst elimination by hydraulic slotting: A case study in Yangliu mine, China," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 6(5), pages 597-614, October.
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    Cited by:

    1. Haijun Guo & Zhixiang Cheng & Kai Wang & Baolin Qu & Liang Yuan & Chao Xu, 2020. "Coal permeability evolution characteristics: Analysis under different loading conditions," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 10(2), pages 347-363, April.

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