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Study on the Long-Distance Gas Pre-Drainage Technology in the Heading Face by Directional Long Borehole

Author

Listed:
  • Yunbing Hou

    (School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

  • Junqi Cui

    (School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

  • Ruipeng Liu

    (School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China)

Abstract

Gas control in the heading face of a coal roadway is an important and difficult point in coal mining in China. On the basis of analyzing the disadvantages of high gas control cost and long drainage period in the existing mine heading face, a long-distance pre-drainage method of long-distance drilling is proposed to control the gas in the heading face so as to improve the tunneling speed. Applied to the engineering geological conditions of Changcun coal mine, the technology is studied in detail. First, a gas migration model considering permeability changing with time is established, and the model is put into the numerical simulation software to study the variation law of permeability and gas pressure under the conditions of single borehole and multi-borehole drainage. The results show that with the increase of drainage time, the permeability around the borehole increases gradually, the gas pressure decreases gradually, and the permeability at the borehole boundary increases the most, reaching 1.2 times the initial permeability. In the process of multi-borehole drainage, there will be mutual influence between boreholes, but with the increase of borehole spacing, the degree of this influence gradually decreases. Second, according to the results of numerical simulation, a reasonable gas drainage scheme is designed and applied in the field. The field application shows that the technology has a good gas drainage effect, the gas drainage concentration and flow are at a high level for a long time, the drilling cuttings quantity is always lower than the critical value, and the excavation length of roadway increases by more than 50 m per month. These results indicate that this technology is a promising method to realize the safe and rapid excavation of a mine coal roadway.

Suggested Citation

  • Yunbing Hou & Junqi Cui & Ruipeng Liu, 2022. "Study on the Long-Distance Gas Pre-Drainage Technology in the Heading Face by Directional Long Borehole," Energies, MDPI, vol. 15(17), pages 1-22, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:17:p:6304-:d:900995
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    References listed on IDEAS

    as
    1. Shouqing Lu & Yuanping Cheng & Jinmin Ma & Yuebing Zhang, 2014. "Application of in-seam directional drilling technology for gas drainage with benefits to gas outburst control and greenhouse gas reductions in Daning coal mine, China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 73(3), pages 1419-1437, September.
    2. Gang Wang & Cheng Fan & Hao Xu & Xuelin Liu & Rui Wang, 2018. "Determination of Long Horizontal Borehole Height in Roofs and Its Application to Gas Drainage," Energies, MDPI, vol. 11(10), pages 1-18, October.
    3. Höök, Mikael & Tang, Xu, 2013. "Depletion of fossil fuels and anthropogenic climate change—A review," Energy Policy, Elsevier, vol. 52(C), pages 797-809.
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