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Predicting Adsorption of Methane and Carbon Dioxide Mixture in Shale Using Simplified Local-Density Model: Implications for Enhanced Gas Recovery and Carbon Dioxide Sequestration

Author

Listed:
  • Yu Pang

    (Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada)

  • Shengnan Chen

    (Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada)

  • Hai Wang

    (Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada)

Abstract

Carbon dioxide (CO 2 ) capture and storage have attracted global focus because CO 2 emissions are responsible for global warming. Recently, injecting CO 2 into shale gas reservoirs is regarded as a promising technique to enhance shale gas (i.e., methane (CH 4 )) production while permanently storing CO 2 underground. This study aims to develop a calculation workflow, which is built on the simplified local-density (SLD) model, to predict excess and absolute adsorption isotherms of gas mixture based on single-component adsorption data. Such a calculation workflow was validated by comparing the measured adsorption of CH 4 , CO 2 , and binary CH 4 /CO 2 mixture in shale reported previously in the literature with the predicted results using the calculation workflow. The crucial steps of the calculation workflow are applying the multicomponent SLD model to conduct regression analysis on the measured adsorption isotherm of each component in the gas mixture simultaneously and using the determined key regression parameters to predict the adsorption isotherms of gas mixtures with various feed-gas mole fractions. Through the calculation workflow, the density profiles and mole fractions of the adsorbed gases can be determined, from which the absolute adsorption of the gas mixture is estimated. In addition, the CO 2 /CH 4 adsorption selectivity larger than one is observed, illustrating the preferential adsorption of CO 2 over CH 4 on shale, which implies that CO 2 has enormous potential to enhance CH 4 production while sequestering itself in shale. Our findings demonstrate that the proposed calculation workflow depending on the multicomponent SLD model enables us to accurately predict the adsorption of gas mixtures in nanopores based on single-component adsorption results. Following the innovative calculation flow path, we could bypass the experimental difficulties of measuring the multicomponent mole fractions in the gas phase at the equilibrium during the adsorption experiments. This study also provides insight into the CO 2 /CH 4 competitive adsorption behavior in nanopores and gives guidance to CO 2 -enhanced gas recovery (CO 2 -EGR) and CO 2 sequestration in shale formations.

Suggested Citation

  • Yu Pang & Shengnan Chen & Hai Wang, 2022. "Predicting Adsorption of Methane and Carbon Dioxide Mixture in Shale Using Simplified Local-Density Model: Implications for Enhanced Gas Recovery and Carbon Dioxide Sequestration," Energies, MDPI, vol. 15(7), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:7:p:2548-:d:784098
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    References listed on IDEAS

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    1. Huang, Liang & Ning, Zhengfu & Wang, Qing & Zhang, Wentong & Cheng, Zhilin & Wu, Xiaojun & Qin, Huibo, 2018. "Effect of organic type and moisture on CO2/CH4 competitive adsorption in kerogen with implications for CO2 sequestration and enhanced CH4 recovery," Applied Energy, Elsevier, vol. 210(C), pages 28-43.
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