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Quantitative characterization of the pore volume fractal dimensions for three kinds of liquid nitrogen frozen coal and its enlightenment to coalbed methane exploitation

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Listed:
  • Qin, Lei
  • Wang, Ping
  • Lin, Haifei
  • Li, Shugang
  • Zhou, Bin
  • Bai, Yang
  • Yan, Dongjie
  • Ma, Chao

Abstract

Liquid nitrogen fracturing technology is an important means to improve the permeability of coal seams and realize unconventional natural gas extraction. In order to study the fractal characteristics of pore structure of coal frozen by liquid nitrogen, the pores of both nonfrozen and frozen samples of lignite, bituminous coal, and anthracite were measured with a high-pressure adsorption meter, a mercury porosimeter, and a low-field nuclear magnetic resonance (NMR). The test results showed that after freezing in liquid nitrogen, the pores of coal were effectively expanded. Among them, Nitrogen adsorption of lignite, bituminous coal and anthracite increased by 20.82%, 6.54% and 20.39%. The conversion rates from adsorption pore to seepage pore were 2.16%, 0.78% and 3.57%. The research results of pore fractal dimension showed that the multifractal characteristics of macropores were higher than that of mesopores and micropores. After liquid nitrogen freezing, the pore fractal dimension of lignite, bituminous coal and anthracite decreased by 0.031, 0.009 and 0.003, and the pore structure tends to be smooth. It showed the liquid nitrogen freezing coal enhances the migration and drainage of coalbed methane, which has reference significance for the further research of liquid nitrogen fracturing technology.

Suggested Citation

  • Qin, Lei & Wang, Ping & Lin, Haifei & Li, Shugang & Zhou, Bin & Bai, Yang & Yan, Dongjie & Ma, Chao, 2023. "Quantitative characterization of the pore volume fractal dimensions for three kinds of liquid nitrogen frozen coal and its enlightenment to coalbed methane exploitation," Energy, Elsevier, vol. 263(PA).
    • Handle: RePEc:eee:energy:v:263:y:2023:i:pa:s0360544222026275
    DOI: 10.1016/j.energy.2022.125741
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    Cited by:

    1. Zang, Jie & Liu, Jialong & He, Jiabei & Zhang, Xiapeng, 2023. "Characterization of the pore structure in Chinese anthracite coal using FIB-SEM tomography and deep learning-based segmentation," Energy, Elsevier, vol. 282(C).
    2. Sun, Fengrui & Liu, Dameng & Cai, Yidong & Qiu, Yongkai, 2023. "A micro-macro coupled permeability model for gas transport in coalbed methane reservoirs," Energy, Elsevier, vol. 284(C).
    3. Zhang, Hewei & Shen, Jian & Wang, Geoff & Li, Kexin & Fang, Xiaojie, 2023. "Experimental study on the effect of high-temperature nitrogen immersion on the nanoscale pore structure of different lithotypes of coal," Energy, Elsevier, vol. 284(C).
    4. Sun, Fengrui & Liu, Dameng & Cai, Yidong & Qiu, Yongkai, 2023. "Coal rank-pressure coupling control mechanism on gas adsorption/desorption in coalbed methane reservoirs," Energy, Elsevier, vol. 270(C).
    5. Cai, Jiawen & Yu, Zhaoyang & Yang, Shengqiang & Tang, Jingxia & Ma, Zhenqian & Xie, Xionggang & Hu, Xincheng, 2023. "Fractal characteristics of coal surface structure during low-temperature oxidation and its effect on oxidizability," Energy, Elsevier, vol. 284(C).

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