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Experimental Investigation of the Effect of Groundwater on the Relative Permeability of Coal Bodies around Gas Extraction Boreholes

Author

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  • Mingkun Pang

    (College of Energy, Xi’an University of Science and Technology, Xi’an 710054, China
    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)

  • Hongyu Pan

    (College of Energy, Xi’an University of Science and Technology, Xi’an 710054, China
    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)

  • Hang 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)

  • Tianjun 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)

Abstract

Water infiltration in boreholes is a common problem in mine gas pre-extraction, where water infiltration can significantly reduce the efficiency of gas extraction and curtail the life cycle of the borehole. It is important to evaluate the effect of groundwater on the permeability of the coal body around a gas extraction borehole. In order to determine the seepage parameters of the fractured coal body system around the borehole, a water–gas two-phase seepage test was designed to determine the relative seepage parameters of the fractured coal media seepage system. The main conclusion is that the relative permeability of gas can be effectively increased by increasing the negative extraction pressure at the early stage of extraction to accelerate drainage to reduce the water saturation of the coal seam. Under the combined effect of porosity and seepage pressure, the relative permeability of gas and water in the fractured coal rock body shows three stages. The dependence of the total permeability on the effective stress is closely related to the stages in the evolution of the pore structure, and the total effective permeability decreases with the increase in the effective stress. A decrease in porosity can lead to a decrease in permeability and an increase in the non-Darcy factor. Through an in-depth analysis of the damage and permeability pattern of the coal body around the perimeter of the dipping borehole, the efficient and safe extraction of gas from dipping boreholes in water-rich mines is thus ensured.

Suggested Citation

  • Mingkun Pang & Hongyu Pan & Hang Zhang & Tianjun Zhang, 2022. "Experimental Investigation of the Effect of Groundwater on the Relative Permeability of Coal Bodies around Gas Extraction Boreholes," IJERPH, MDPI, vol. 19(20), pages 1-21, October.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:20:p:13609-:d:948231
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    References listed on IDEAS

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    1. Sheng Wang & Xuelong Li & Qizhi Qin, 2022. "Study on Surrounding Rock Control and Support Stability of Ultra-Large Height Mining Face," Energies, MDPI, vol. 15(18), pages 1-20, September.
    2. Zongxing Zou & Sha Lu & Fei Wang & Huiming Tang & Xinli Hu & Qinwen Tan & Yi Yuan, 2020. "Application of Well Drainage on Treating Seepage-Induced Reservoir Landslides," IJERPH, MDPI, vol. 17(17), pages 1-20, August.
    3. Yongfeng Gong & Zuo Liu & Chuanming Ma & Minghong Li & Xu Guo, 2021. "Experimental Study on the Lateral Seepage Characteristics in the Tension Saturated Zone," IJERPH, MDPI, vol. 18(10), pages 1-12, May.
    4. Yu-Ling Yang & Krishna R. Reddy & Wen-Jie Zhang & Ri-Dong Fan & Yan-Jun Du, 2020. "SHMP-Amended Ca-Bentonite/Sand Backfill Barrier for Containment of Lead Contamination in Groundwater," IJERPH, MDPI, vol. 17(1), pages 1-14, January.
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    Cited by:

    1. Pang, Mingkun & Pan, Hongyu & Ji, Bingnan & Zhang, Hang & Zhang, Tianjun, 2023. "Experimental investigation of flow regime transition characteristics of fractured coal bodies around gas extraction boreholes," Energy, Elsevier, vol. 270(C).

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