Volume 43 Issue 1
Oct.  2021
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FENG Wenjun, SU Xianbo, WANG Jianwei, QIN Junbin, LI Xianzhong. The mechanism and field test of permeability improvement by hydraulic flushing in three-soft and single coal seam[J]. COAL GEOLOGY & EXPLORATION, 2015, 43(1): 100-103. DOI: 10.3969/j.issn.1001-1986.2015.01.021
Citation: FENG Wenjun, SU Xianbo, WANG Jianwei, QIN Junbin, LI Xianzhong. The mechanism and field test of permeability improvement by hydraulic flushing in three-soft and single coal seam[J]. COAL GEOLOGY & EXPLORATION, 2015, 43(1): 100-103. DOI: 10.3969/j.issn.1001-1986.2015.01.021
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The mechanism and field test of permeability improvement by hydraulic flushing in three-soft and single coal seam

  • 1. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China;

  • 2. Daping Mine, Zhengzhou Coal Industry Group Corporation Ltd., Dengfeng 452373, China

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  • Received Date: August 28, 2013
  • Available Online: October 21, 2021
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    • Abstract
  • Hydraulic flushing is the most effective way for high-efficient extraction in three-soft coal seam. In this paper, the mechanism was studied by laboratory experiment, theoretical analysis and field test for pressure relief and permeability improvement in three-soft coal seam after hydraulic flushing. The coupling experiment of stress and strain-coal structure-permeability revealed the evolution of permeability along with the change of the structure and stress, and found that permeability of soft coal was improved on a large scale after pressure relief. Based on Hoek-Brown criterion theory, the numerical simulation results show that the relief range increased significantly after hydraulic flushing in coal. The hydraulic flushing tests using self-developed machine for gas drainage borehole in 21141 floor drainage tunnel of Daping Mine shows, the machine made hydraulic flushing more secure and efficient, and made it possible to repair the old drainage borehole. The field tests fully tested the reliability of the equipment and the accuracy of the above theoretical analysis, and improved the extraction efficiency significantly.
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