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Effect of CO2 injection on the gas desorption and diffusion kinetics: An experimental study

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Listed:
  • Bai, Gang
  • Su, Jun
  • Fu, Shigen
  • Li, Xueming
  • Zhou, Xihua
  • Wang, Jue
  • Liu, Zhengdong
  • Zhang, Xun

Abstract

During CO2 displacement, the diffusion characteristics of gas in the coal matrix are among the key factors that affect the gas extraction rate, and discussed the influence mechanism of CO2 injection on the diffusion kinetics of coal seam gas. In this study, we used a self-developed CO2–CH4 displacement experimental platform to study the diffusion characteristics of CH4 under different CO2 injection pressures and temperatures. As the CO2 injection pressure was increased from 0.6 MPa to 1.0 MPa, the CH4 production increased by 9.44 %, the CH4 maximum diffusivity increased by 0.05, the effective diffusion coefficient extreme point increased by 111.45 %. As the gas injection temperature was increased from 40 °C to 60 °C, the CH4 production increased by 4.02 %, the CH4 maximum diffusivity increased by 0.03, the maximum of the effective diffusion coefficient increased by 103.31 %. To better explain the gas diffusion characteristics during CO2 displacement, the influence mechanism of increasing CO2 injection pressure and temperature on the CH4 diffusion kinetics was discussed, and the driving force (fd) and resistance (fr) during the displacement process were studied. The dynamic CO2 injection models were considered to be more effective in ensuring efficient CH4 recovery.

Suggested Citation

  • Bai, Gang & Su, Jun & Fu, Shigen & Li, Xueming & Zhou, Xihua & Wang, Jue & Liu, Zhengdong & Zhang, Xun, 2024. "Effect of CO2 injection on the gas desorption and diffusion kinetics: An experimental study," Energy, Elsevier, vol. 288(C).
    • Handle: RePEc:eee:energy:v:288:y:2024:i:c:s0360544223033157
    DOI: 10.1016/j.energy.2023.129921
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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).
    2. 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).
    3. Lin, Jia & Ren, Ting & Cheng, Yuanping & Nemcik, Jan & Wang, Gongda, 2019. "Cyclic N2 injection for enhanced coal seam gas recovery: A laboratory study," Energy, Elsevier, vol. 188(C).
    4. Bai, Gang & Su, Jun & Li, Xueming & Guo, Chunsheng & Han, Mingxu & Zhou, Xihua & Fan, Chaojun, 2022. "Step-by-step CO2 injection pressure for enhanced coal seam gas recovery: A laboratory study," Energy, Elsevier, vol. 260(C).
    5. Zhang, Chaolin & Wang, Enyuan & Li, Bobo & Kong, Xiangguo & Xu, Jiang & Peng, Shoujian & Chen, Yuexia, 2023. "Laboratory experiments of CO2-enhanced coalbed methane recovery considering CO2 sequestration in a coal seam," Energy, Elsevier, vol. 262(PA).
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