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Optimization of Accurate Spacing for Gas Extraction from Damaged Coal Seams Based on a Dual-Penetration Model

Author

Listed:
  • Jin Yan

    (School of Resource and Security Engineering, Wuhan Institute of Technology, Wuhan 430074, China)

  • Kejiang Lei

    (School of Resource and Security Engineering, Wuhan Institute of Technology, Wuhan 430074, China)

  • Yuangang Jiang

    (Security Department, University of International Business and Economics, Beijing 100029, China)

  • Minbo Zhang

    (School of Resource and Security Engineering, Wuhan Institute of Technology, Wuhan 430074, China)

  • Weizhong Zhang

    (School of Resource and Security Engineering, Wuhan Institute of Technology, Wuhan 430074, China)

  • Hao Yin

    (School of Resource and Security Engineering, Wuhan Institute of Technology, Wuhan 430074, China)

Abstract

In order to develop precise hole placement technology for gas extraction, this paper combines industrial testing, the evolution law of coal rock damage permeability, and the coal double-pore double-permeability model; establishes a coupling model of the coal damage deformation field and matrix-fracture double diffusion seepage field; and determines precise hole placement spacing for a coal seam gas by using the COMSOL Multiphysics 5.6 numerical simulation software. This study shows that the effective radius of gas extraction is 4.8 m after 180 d of extraction, which is a power function of the extraction time. The permeability of the coal body is affected by matrix adsorption, and contraction and effective stress, and the influence range between the boreholes under multi-hole extraction increases with the increase in spacing; at the same time, we took into account the positive effect of the permeability change on the extraction effect and ultimately determined the optimal spacing of boreholes in Dashucun Mine to be 6 m, which was arranged in the square area. The extraction effect was good after the on-site test, and the results of this study can provide guidance for the optimal arrangement of the spacing of boreholes in the underground areas of coal mines.

Suggested Citation

  • Jin Yan & Kejiang Lei & Yuangang Jiang & Minbo Zhang & Weizhong Zhang & Hao Yin, 2023. "Optimization of Accurate Spacing for Gas Extraction from Damaged Coal Seams Based on a Dual-Penetration Model," Sustainability, MDPI, vol. 15(21), pages 1-23, October.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:21:p:15339-:d:1268295
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    References listed on IDEAS

    as
    1. Oksana Marinina & Anna Nechitailo & Gennady Stroykov & Anna Tsvetkova & Ekaterina Reshneva & Liudmila Turovskaya, 2023. "Technical and Economic Assessment of Energy Efficiency of Electrification of Hydrocarbon Production Facilities in Underdeveloped Areas," Sustainability, MDPI, vol. 15(12), pages 1-25, June.
    2. Jin Yan & Minbo Zhang & Weizhong Zhang & Qinrong Kang, 2023. "Simulation Study on the Characteristics of Gas Extraction from Coal Seams Based on the Superposition Effect and Hole Placement Method," Sustainability, MDPI, vol. 15(10), pages 1-19, May.
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