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Coal permeability evolution triggered by variable injection parameters during gas mixture enhanced methane recovery

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  • Zhou, Lijun
  • Zhou, Xihua
  • Fan, Chaojun
  • Bai, Gang

Abstract

Injection of gas mixture (CO2/N2) into coal seam can both enhance methane recovery and reduce carbon dioxide emission. Coal permeability determines the mass transport speed, which acts an important index in evaluating gas injectability and methane recovery rate. To reveal effects of injected pressure, temperature and CO2 component in mixture on coal permeability evolution, the heat-fluid-solid coupling model in coal seam was proposed and series of simulations on gas mixture enhanced methane recovery were carried out. Results show that the continuous injected gas mixture replaces and drives methane toward the extraction borehole. The coal permeability is related to the heat or gas sorption induced coal swelling/shrinkage, gas pressure and geostress induced deformation, and coal mechanical properties. The coal permeability increases around the extraction borehole as CH4 pressure drops. There appears declining permeability zone as the arrive of CO2, resulting by the greater adsorption affinity than that of N2 and CH4. The higher the injected pressure, the greater increase of permeability. Coal permeability decreases slightly with the injected temperature, however changes dramatically with the varying of injected CO2 component. The effects of injection parameters on permeability evolution are CO2 component, injection pressure, and injection temperature successively.

Suggested Citation

  • Zhou, Lijun & Zhou, Xihua & Fan, Chaojun & Bai, Gang, 2022. "Coal permeability evolution triggered by variable injection parameters during gas mixture enhanced methane recovery," Energy, Elsevier, vol. 252(C).
    • Handle: RePEc:eee:energy:v:252:y:2022:i:c:s0360544222009689
    DOI: 10.1016/j.energy.2022.124065
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    References listed on IDEAS

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    3. Song, Haoran & Zhong, Zheng & Lin, Baiquan, 2023. "Impact of methane gas diffusion in coal on elastic modulus and porosity: Modeling and analysis," Energy, Elsevier, vol. 271(C).
    4. Xu, Chao & Ma, Sibo & Wang, Kai & Yang, Gang & Zhou, Xin & Zhou, Aitao & Shu, Longyong, 2023. "Stress and permeability evolution of high-gassy coal seams for repeated mining," Energy, Elsevier, vol. 284(C).
    5. Zhang, Baoxin & Deng, Ze & Fu, Xuehai & Yu, Kun & Zeng, Fanhua (Bill), 2023. "An experimental study on the effects of acidization on coal permeability: Implications for the enhancement of coalbed methane production," Energy, Elsevier, vol. 280(C).
    6. Zhou, Aitao & Li, Jingwen & Gong, Weili & Wang, Kai & Du, Changang, 2023. "Theoretical and numerical study on the contribution of multi-hole arrangement to coalbed methane extraction," Energy, Elsevier, vol. 284(C).
    7. Tang, Jiren & Chen, Long & Liu, Wenchuan & Zhang, Huali & Wang, Junxin & Liu, Qi, 2023. "Investigation on jet diffusion mechanism with applications to enhancing efficiency in forming directional fractures," Energy, Elsevier, vol. 262(PB).

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