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Research on coal matrix pore structure evolution and adsorption behavior characteristics under different thermal stimulation

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  • Wang, Hao
  • Wang, Liang
  • Zheng, Siwen
  • Sun, Yiwei
  • Shen, Shangkun
  • Zhang, Xiaolei

Abstract

The technique of thermal stimulation for coalbed methane extraction is considered an important approach for increasing coalbed methane production capacity in the future. This study focuses on the impact of the thermal evolution of pore structure in coal on gas adsorption characteristics. The low-pressure CO2 and N2 physical adsorption data were analyzed using classical thermodynamic methods and density functional theory. The results showed a decrease in pore volume and an increase in average pore size. The fractal dimensions obtained from the Frenkel-Halsey-Hill and Sierpinski fractal models indicate that the micro-scale spatial structure of coal becomes simpler, and the surface becomes smoother. The high-pressure volumetric method was employed to determine the gas adsorption parameters of the coal, and a comparison was made between the calculated gas adsorption parameters based on the micro-pore structure parameters of the coal samples. It was found that the variation pattern of micro-pores in the coal samples correlated highly with the methane adsorption capacity. The decrease in adsorption capacity increases the proportion of free-phase methane, which helps enhance the early-stage methane extraction rate. Improving gas migration pathways avoids the limitation imposed by diffusion in the later stages of coalbed methane extraction.

Suggested Citation

  • Wang, Hao & Wang, Liang & Zheng, Siwen & Sun, Yiwei & Shen, Shangkun & Zhang, Xiaolei, 2024. "Research on coal matrix pore structure evolution and adsorption behavior characteristics under different thermal stimulation," Energy, Elsevier, vol. 287(C).
    • Handle: RePEc:eee:energy:v:287:y:2024:i:c:s0360544223030712
    DOI: 10.1016/j.energy.2023.129677
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    References listed on IDEAS

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    1. Yang, Wei & Wang, Yihan & Yan, Fazhi & Si, Guangyao & Lin, Baiquan, 2022. "Evolution characteristics of coal microstructure and its influence on methane adsorption capacity under high temperature pyrolysis," Energy, Elsevier, vol. 254(PA).
    2. Lan, Wenjian & Wang, Hanxiang & Liu, Qihu & Zhang, Xin & Chen, Jingkai & Li, Ziling & Feng, Kun & Chen, Shengshan, 2021. "Investigation on the microwave heating technology for coalbed methane recovery," Energy, Elsevier, vol. 237(C).
    3. Li, Jun & Huang, Qiming & Wang, Gang & Wang, Enmao & Ju, Shuang & Qin, Cunli, 2022. "Experimental study of effect of slickwater fracturing on coal pore structure and methane adsorption," Energy, Elsevier, vol. 239(PE).
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    5. Nie, Bin, 2023. "Development of low-metamorphic coalbed methane reservoirs with superheated steam injection: Simulation of wellbore heat transfer," Energy, Elsevier, vol. 275(C).
    6. Lan, Wenjian & Wang, Hanxiang & Zhang, Xin & Fan, Hongbo & Feng, Kun & Liu, Yanxin & Sun, Bingyu, 2020. "Investigation on the mechanism of micro-cracks generated by microwave heating in coal and rock," Energy, Elsevier, vol. 206(C).
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