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Molecular Investigation on the Displacement Characteristics of CH 4 by CO 2 , N 2 and Their Mixture in a Composite Shale Model

Author

Listed:
  • Liang Gong

    (College of New Energy, China University of Petroleum (East China), Qingdao 266580, China)

  • Yuan Zhang

    (College of New Energy, China University of Petroleum (East China), Qingdao 266580, China)

  • Na Li

    (College of New Energy, China University of Petroleum (East China), Qingdao 266580, China)

  • Ze-Kai Gu

    (College of New Energy, China University of Petroleum (East China), Qingdao 266580, China)

  • Bin Ding

    (College of New Energy, China University of Petroleum (East China), Qingdao 266580, China)

  • Chuan-Yong Zhu

    (College of New Energy, China University of Petroleum (East China), Qingdao 266580, China)

Abstract

The rapid growth in energy consumption and environmental pollution have greatly stimulated the exploration and utilization of shale gas. The injection of gases such as CO 2 , N 2 , and their mixture is currently regarded as one of the most effective ways to enhance gas recovery from shale reservoirs. In this study, molecular simulations were conducted on a kaolinite–kerogen IID composite shale matrix to explore the displacement characteristics of CH 4 using different injection gases, including CO 2 , N 2 , and their mixture. The results show that when the injection pressure was lower than 10 MPa, increasing the injection pressure improved the displacement capacity of CH 4 by CO 2 . Correspondingly, an increase of formation temperature also increased the displacement efficiency of CH 4 , but an increase of pore size slightly increased this displacement efficiency. Moreover, it was found that when the proportion of CO 2 and N 2 was 1:1, the displacement efficiency of CH 4 was the highest, which proved that the simultaneous injection of CO 2 and N 2 had a synergistic effect on shale gas production. The results of this paper will provide guidance and reference for the displacement exploitation of shale gas by injection gases.

Suggested Citation

  • Liang Gong & Yuan Zhang & Na Li & Ze-Kai Gu & Bin Ding & Chuan-Yong Zhu, 2020. "Molecular Investigation on the Displacement Characteristics of CH 4 by CO 2 , N 2 and Their Mixture in a Composite Shale Model," Energies, MDPI, vol. 14(1), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:14:y:2020:i:1:p:2-:d:466183
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    References listed on IDEAS

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    1. Wang, Lei & Yao, Bowen & Xie, Haojun & Winterfeld, Philip H. & Kneafsey, Timothy J. & Yin, Xiaolong & Wu, Yu-Shu, 2017. "CO2 injection-induced fracturing in naturally fractured shale rocks," Energy, Elsevier, vol. 139(C), pages 1094-1110.
    2. Lyu, Qiao & Long, Xinping & Ranjith, P.G. & Tan, Jingqiang & Kang, Yong & Wang, Zhanghu, 2018. "Experimental investigation on the mechanical properties of a low-clay shale with different adsorption times in sub-/super-critical CO2," Energy, Elsevier, vol. 147(C), pages 1288-1298.
    3. Fengshuang Du & Bahareh Nojabaei, 2019. "A Review of Gas Injection in Shale Reservoirs: Enhanced Oil/Gas Recovery Approaches and Greenhouse Gas Control," Energies, MDPI, vol. 12(12), pages 1-33, June.
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