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Research on Hole Collapse Monitoring Technology of Coal Seam Gas Extraction Boreholes

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  • Renhui Cheng

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi’an 710054, China)

  • Chao Zhang

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi’an 710054, China)

  • Fuhuai Fan

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi’an 710054, China)

  • Chenye Duan

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi’an 710054, China)

  • Zhiheng Chen

    (College of Safety Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    Key Laboratory of Western Mine Exploitation and Hazard Prevention of the Ministry of Education, Xi’an 710054, China)

Abstract

It is difficult to monitor the collapse position of a gas extraction borehole in a coal seam. In order to solve this problem, a fiber-optic grating collapse monitoring technology was proposed. Five kinds of grating arrangements (0°, 45°, 90°, 135°, 180°) were examined to simulate the hole collapse. The relationship model between the center wavelength offset and the amount of collapsed coal and extraction flow was constructed to obtain the distribution curve of the hole collapse position and quality along the length of the hole, and flow decay rates of 80% and 50% were used as the critical values to classify the three levels of hole collapse. The results show that the hole collapse monitoring accuracy is the highest with the grating measurement points located below the substrate material arrangement. Finally, the effectiveness of fiber-optic grating monitoring technology was verified in the 2202 working face of the Changcun coal mine of the Lu’an Group, and the pure amount of gas extraction from the repaired borehole after monitoring was increased by 62.6% compared with that before the repair.

Suggested Citation

  • Renhui Cheng & Chao Zhang & Fuhuai Fan & Chenye Duan & Zhiheng Chen, 2023. "Research on Hole Collapse Monitoring Technology of Coal Seam Gas Extraction Boreholes," Sustainability, MDPI, vol. 15(13), pages 1-13, June.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:13:p:10262-:d:1181902
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    References listed on IDEAS

    as
    1. Tianjun Zhang & Zhiqiang Ling & Mingkun Pang & Yukai Meng, 2021. "Experimental Study of Creep Acoustic Emission Characteristics of Coal Bodies around Boreholes under Different Moisture Contents," Energies, MDPI, vol. 14(11), pages 1-13, May.
    2. Huayong Lv & Defeng Wang & Zhanbo Cheng & Yaning Zhang & Tao Zhou, 2022. "Study on Mechanical Characteristics and Failure Modes of Coal–Mudstone Combined Body with Prefabricated Crack," Mathematics, MDPI, vol. 10(2), pages 1-18, January.
    3. Dan Yu & Xiaoyong Yi & Zhimeng Liang & Jinfu Lou & Weibing Zhu, 2021. "Research on Strong Ground Pressure of Multiple-Seam Caused by Remnant Room Pillars Undermining in Shallow Seams," Energies, MDPI, vol. 14(17), pages 1-15, August.
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