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Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network

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  • Peiyun Xu

    (School of Safety Science and Engineering, Xi’an University of Science and Technology (XUST), No. 58, Yanta Mid. Rd., Xi’an 710054, China)

  • Shugang Li

    (School of Safety Science and Engineering, Xi’an University of Science and Technology (XUST), No. 58, Yanta Mid. Rd., Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, XUST, No. 58, Yanta Mid. Rd., Xi’an 710054, China)

  • Haifei Lin

    (School of Safety Science and Engineering, Xi’an University of Science and Technology (XUST), No. 58, Yanta Mid. Rd., Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, XUST, No. 58, Yanta Mid. Rd., Xi’an 710054, China)

  • Yang Ding

    (School of Safety Science and Engineering, Xi’an University of Science and Technology (XUST), No. 58, Yanta Mid. Rd., Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, XUST, No. 58, Yanta Mid. Rd., Xi’an 710054, China)

  • Haiqing Shuang

    (School of Safety Science and Engineering, Xi’an University of Science and Technology (XUST), No. 58, Yanta Mid. Rd., Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, XUST, No. 58, Yanta Mid. Rd., Xi’an 710054, China)

  • Sibo Liu

    (School of Safety Science and Engineering, Xi’an University of Science and Technology (XUST), No. 58, Yanta Mid. Rd., Xi’an 710054, China)

  • Yu Tian

    (School of Safety Science and Engineering, Xi’an University of Science and Technology (XUST), No. 58, Yanta Mid. Rd., Xi’an 710054, China)

Abstract

The process of underground coal mining fractures the overlying strata and may provide storage and transportation space for gas by changing the roof rock permeability, which is released by pressure after mining. This paper adopts the experimental method of physical similarity simulation and combines the fractal theory to study the permeability characteristics of the fracture network after mining, and it establishes the fractal permeability equation of pressure-relief gas. The results of the study show that the fracture opening shows a positive correlation with the overburden permeability, whereas the tortuosity of the fracture shows a negative correlation with the overburden permeability. The shape of the high permeability area in the fracture network is found to be similar to the hat-shaped elliptical parabolic zone. In the process of permeability evolution, the key layer structure of the overburden rock is considered as the main factor that affects the trend of change in permeability. Furthermore, based on the above research results, this study developed a targeted design of high-level boreholes in the experimental face and reversed the permeability changes around the drainage borehole. The average error between the actual measured value and the theoretically calculated value is found to be 8.11%. The theoretical model and the permeability evolution law obtained from the research results can provide valuable references and insights into further research on the pressure-relief gas flow model in the goaf.

Suggested Citation

  • Peiyun Xu & Shugang Li & Haifei Lin & Yang Ding & Haiqing Shuang & Sibo Liu & Yu Tian, 2021. "Fractal Characterization of Pressure-Relief Gas Permeability Evolution in a Mining Fracture Network," Energies, MDPI, vol. 14(21), pages 1-21, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7031-:d:665638
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    References listed on IDEAS

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    1. Cai, Jianchao & Zhang, Zhien & Wei, Wei & Guo, Dongming & Li, Shuai & Zhao, Peiqiang, 2019. "The critical factors for permeability-formation factor relation in reservoir rocks: Pore-throat ratio, tortuosity and connectivity," Energy, Elsevier, vol. 188(C).
    2. Zhao, Pengxiang & Zhuo, Risheng & Li, Shugang & Shu, Chi-Min & Jia, Yongyong & Lin, Haifei & Chang, Zechen & Ho, Chun-Hsing & Laiwang, Bin & Xiao, Peng, 2021. "Fractal characteristics of methane migration channels in inclined coal seams," Energy, Elsevier, vol. 225(C).
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    1. Guorui Feng & Weichao Fan & Zhen Li & Zhiwei Wang & Yidie Zhang & Yanqun Yang & Xiaohong Yang & Xiangming Zhang & Gan Feng, 2023. "Digital Quantitative Study on Fracture Gas Storage Space for a Three-Layer Composite Residual Mining Area," Sustainability, MDPI, vol. 15(8), pages 1-19, April.

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