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Fractal characteristics of methane migration channels in inclined coal seams

Author

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  • Zhao, Pengxiang
  • Zhuo, Risheng
  • Li, Shugang
  • Shu, Chi-Min
  • Jia, Yongyong
  • Lin, Haifei
  • Chang, Zechen
  • Ho, Chun-Hsing
  • Laiwang, Bin
  • Xiao, Peng

Abstract

Methane safety extraction is an effective method for reducing methane concentration in the gob and enhanced coal-bed methane recovery that is widely used in China. Although there is already extensive research on this technique, dip angle coal of seams has unpredictable effects on methane extraction locations, which is an influential factor that has rarely been studied, especially where the seam dip angles are larger. The benefits of this paper include improving methane extraction techniques, exploring the fractal characteristic of channel, and developing the laws governing how channels emerge, especially where coal seam dip angles vary. The results show that with increased coal seam dip angle, the height and width of channels show an increasing trend, along with crack angle. Key parameters of the methane migration channel boundaries in mutant regions of the bed separated under inclined coal mines were also defined. In the laboratory, an effective model was put forward to calculate the evolution characteristics of channels under inclined coal mining using fractal and elliptic paraboloid zone theory (EPZ); the finding was that the height of the A region at 30° was 1.34 and 2.00 times that of 15°, 0°, respectively. Moreover, borehole methane extraction concentration in area B increased to 6.04% in field application. The research results are expected to benefit industry and mine safety staff when arranging the position of high-level boreholes. The findings can enhance safety levels and improve efficiency in inclined coal mining.

Suggested Citation

  • 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).
    • Handle: RePEc:eee:energy:v:225:y:2021:i:c:s0360544221003765
    DOI: 10.1016/j.energy.2021.120127
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    References listed on IDEAS

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    1. 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.
    2. Boris V. Malozyomov & Vladimir Ivanovich Golik & Vladimir Brigida & Vladislav V. Kukartsev & Yadviga A. Tynchenko & Andrey A. Boyko & Sergey V. Tynchenko, 2023. "Substantiation of Drilling Parameters for Undermined Drainage Boreholes for Increasing Methane Production from Unconventional Coal-Gas Collectors," Energies, MDPI, vol. 16(11), pages 1-16, May.
    3. Bao Shi & Pengfei Wang, 2023. "Research on Stability Control of Shields at Working Face with Large Dip Angle," Energies, MDPI, vol. 16(15), pages 1-19, August.
    4. Fan Zhang & Guangsen Wang & Binbin Wang, 2023. "Study and Application of High-Level Directional Extraction Borehole Based on Mining Fracture Evolution Law of Overburden Strata," Sustainability, MDPI, vol. 15(3), pages 1-15, February.
    5. Zhao, Pengxiang & Zhuo, Risheng & Li, Shugang & Lin, Haifei & Shu, Chi-Min & Shuang, Haiqing & Wei, Zongyong, 2023. "Greenhouse gas protection and control based upon the evolution of overburden fractures under coal mining: A review of methods, influencing factors, and techniques," Energy, Elsevier, vol. 284(C).

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