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Measurement of the coefficient of seepage characteristics in pore-crushed coal bodies around gas extraction boreholes

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  • Pang, Mingkun
  • Zhang, Tianjun
  • Ji, Xiang
  • Wu, Jinyu
  • Song, Shuang

Abstract

Gas extraction is a form of energy extraction. The seepage and transport of gas during extraction is complex. The accurate determination of its permeation parameters is an important technical parameter. A tri-axial permeation test of the crushed grain media was designed to determine the permeation pattern of gas fuels within the crushed coal around the borehole. The resistance to gas fuel seepage was explored. The results show that: the pore structure formed by the crushed coal grains will be compressed and closed again under three-dimensional stress. The process of deformation and destruction of crushed coal grains can be divided into three stages: when the grains are subjected to a force of 1.2 kN–1.4 kN, the grains may compress each other to form a colloid. The coefficient of resistance is dependent on the permeability of the crushed coal sample, and the non-Darcian phenomenon caused by inertial loss during permeation can be characterized by the distribution of Re values f = 149.1/Re + 1.5. The two coefficients of the quadratic term in the Forchheimer equation change dynamically as the flow regime changes. This result can provide a theoretical basis for the efficient extraction of gas resources.

Suggested Citation

  • Pang, Mingkun & Zhang, Tianjun & Ji, Xiang & Wu, Jinyu & Song, Shuang, 2022. "Measurement of the coefficient of seepage characteristics in pore-crushed coal bodies around gas extraction boreholes," Energy, Elsevier, vol. 254(PA).
    • Handle: RePEc:eee:energy:v:254:y:2022:i:pa:s0360544222011793
    DOI: 10.1016/j.energy.2022.124276
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    References listed on IDEAS

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    1. Bai, Gang & Su, Jun & Zhang, Zunguo & Lan, Anchang & Zhou, Xihua & Gao, Fei & Zhou, Jianbin, 2022. "Effect of CO2 injection on CH4 desorption rate in poor permeability coal seams: An experimental study," Energy, Elsevier, vol. 238(PA).
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    3. Yan, Min & Zhou, Ming & Li, Shugang & Lin, Haifei & Zhang, Kunyin & Zhang, Binbin & Shu, Chi-Min, 2021. "Numerical investigation on the influence of micropore structure characteristics on gas seepage in coal with lattice Boltzmann method," Energy, Elsevier, vol. 230(C).
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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).
    2. Cheng, Ming & Fu, Xuehai & Chen, Zhaoying & Liu, Ting & Zhang, Miao & Kang, Junqiang, 2023. "A new approach to evaluate abandoned mine methane resources based on the zoning of the mining-disturbed strata," Energy, Elsevier, vol. 274(C).
    3. Yongzan, Wen & Guanhua, Ni & Xinyue, Zhang & Yicheng, Zheng & Gang, Wang & Zhenyang, Wang & Qiming, Huang, 2023. "Fine characterization of pore structure of acidified anthracite based on liquid intrusion method and Micro-CT," Energy, Elsevier, vol. 263(PA).
    4. Li, Jiangtao & Zhou, Xiaofeng & Gayubov, Abdumalik & Shamil, Sultanov, 2023. "Study on production performance characteristics of horizontal wells in low permeability and tight oil reservoirs," Energy, Elsevier, vol. 284(C).

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