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Volume 45 Issue 3
May  2023
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Article Navigation >  PETROLEUM GEOLOGY & EXPERIMENT  > 2023  >  45(3): 560-565
QIAN Yingqiang, YANG Xue, LIU Xiaoqiang, LI Meijun, CHEN Zeqin, XUE Ying. Molecular simulation of the displacement of shale gas in quartz slit by flue gas[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(3): 560-565. doi: 10.11781/sysydz202303560
Citation: QIAN Yingqiang, YANG Xue, LIU Xiaoqiang, LI Meijun, CHEN Zeqin, XUE Ying. Molecular simulation of the displacement of shale gas in quartz slit by flue gas[J]. PETROLEUM GEOLOGY & EXPERIMENT, 2023, 45(3): 560-565. doi: 10.11781/sysydz202303560
shu

Molecular simulation of the displacement of shale gas in quartz slit by flue gas

doi: 10.11781/sysydz202303560
  • 1.

    College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, Sichuan 610059, China

  • 2.

    College of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong, Sichuan 643000, China

  • 3.

    College of Geosciences, China University of Petroleum, Beijing 102249, China

  • 4.

    College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China

  • Received Date: 2022-11-29
  • Rev Recd Date: 2023-04-02
  • Publish Date: 2023-05-28
    Abstract
  • To study the efficiency of flue gas sequestration with enhanced shale gas recovery in quartz slit, Grand Canonical Monte Carlo (GCMC) and Molecular Dynamics (MD) simulations were adopted to investigate the influence of burial depth, formation water content and the injection ratio of flue gas on the recovery efficiency of shale gas (CH4) in quartz slit by flue gas (CO2/N2). The density distribution, loading, adsorption heat and interaction energy of each component were systematically analyzed to reveal their adsorption mechanisms and the recovery efficiency of CH4. It indicates that the loadings of mixed CH4 and N2 (ΓCH4 and ΓN2) exhibit negative correlation with formation water content. With the increasing burial depth, both ΓCH4 and ΓN2 increase at first and then tend to be constant when the burial depth is over 2 400 m. The maximum loading of CO2 (ΓCO2) occurs at the burial depth of 2 400 m. There is a positive correlation of ΓCO2 with formation water content when the burial depth is below 2 400 m, and a negative correlation when the burial depth is over 2 400 m. The recovery efficiency of CH4 (η) reaches the maximum point at the burial depth of 400-600 m, which increases with the increasing mole fraction of CO2 in flue gas, showing that CO2 in flue gas can promote the displacement of CH4 significantly.

     

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