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Study on the Adsorption, Diffusion and Permeation Selectivity of Shale Gas in Organics

Author

Listed:
  • Zhouhua Wang

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Yun Li

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Huang Liu

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Fanhua Zeng

    (Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, SK S4S 0A2, Canada)

  • Ping Guo

    (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China)

  • Wei Jiang

    (School of Chemical Engineering, Sichuan University, Chengdu 610065, China)

Abstract

As kerogen is the main organic component in shale, the adsorption capacity, diffusion and permeability of the gas in kerogen plays an important role in shale gas production. Based on the molecular model of type II kerogen, an organic nanoporous structure was established. The Grand Canonical Monte Carlo (GCMC) and Molecular Dynamics (MD) methods were used to study the adsorption and diffusion capacity of mixed gas systems with different mole ratios of CO 2 and CH 4 in the foregoing nanoporous structure, and gas adsorption, isosteric heats of adsorption and self-diffusion coefficient were obtained. The selective permeation of gas components in the organic pores was further studied. The results show that CO 2 and CH 4 present physical adsorption in the organic nanopores. The adsorption capacity of CO 2 is larger than that of CH 4 in organic pores, but the self-diffusion coefficient of CH 4 in mixed gas is larger than that of CO 2 . Moreover, the self-diffusion coefficient in the horizontal direction is larger than that in the vertical direction. The mixed gas pressure and mole ratio have limited effects on the isosteric heat and the self-diffusion of CH 4 and CO 2 adsorption. Regarding the analysis of mixed gas selective permeation, it is concluded that the adsorption selectivity of CO 2 is larger than that of CH 4 in the organic nanopores. The larger the CO 2 /CH 4 mole ratio, the greater the adsorption and permeation selectivity of mixed gas in shale. The permeation process is mainly controlled by adsorption rather than diffusion. These results are expected to reveal the adsorption and diffusion mechanism of gas in shale organics, which has a great significance for further research.

Suggested Citation

  • Zhouhua Wang & Yun Li & Huang Liu & Fanhua Zeng & Ping Guo & Wei Jiang, 2017. "Study on the Adsorption, Diffusion and Permeation Selectivity of Shale Gas in Organics," Energies, MDPI, vol. 10(1), pages 1-15, January.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:1:p:142-:d:88542
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    References listed on IDEAS

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    1. Jiafei Zhao & Kun Xu & Yongchen Song & Weiguo Liu & Weihaur Lam & Yu Liu & Kaihua Xue & Yiming Zhu & Xichong Yu & Qingping Li, 2012. "A Review on Research on Replacement of CH 4 in Natural Gas Hydrates by Use of CO 2," Energies, MDPI, vol. 5(2), pages 1-21, February.
    2. Hu, Haixiang & Li, Xiaochun & Fang, Zhiming & Wei, Ning & Li, Qianshu, 2010. "Small-molecule gas sorption and diffusion in coal: Molecular simulation," Energy, Elsevier, vol. 35(7), pages 2939-2944.
    3. Yang, Mingjun & Song, Yongchen & Jiang, Lanlan & Zhao, Yuechao & Ruan, Xuke & Zhang, Yi & Wang, Shanrong, 2014. "Hydrate-based technology for CO2 capture from fossil fuel power plants," Applied Energy, Elsevier, vol. 116(C), pages 26-40.
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    Cited by:

    1. Seyedalireza Khatibi & Mehdi Ostadhassan & David Tuschel & Thomas Gentzis & Humberto Carvajal-Ortiz, 2018. "Evaluating Molecular Evolution of Kerogen by Raman Spectroscopy: Correlation with Optical Microscopy and Rock-Eval Pyrolysis," Energies, MDPI, vol. 11(6), pages 1-19, May.
    2. Li, Jiawei & Sun, Chenhao, 2022. "Molecular insights on competitive adsorption and enhanced displacement effects of CO2/CH4 in coal for low-carbon energy technologies," Energy, Elsevier, vol. 261(PB).

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