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Effect of Residual Water in Sediments on the CO 2 -CH 4 Replacement Process

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  • Fuqin Lu

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    State Key Laboratory of Natural Gas Hydrate, Beijing 100028, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    University of Chinese Academy of Sciences, Beijing 100049, China)

  • Xuebing Zhou

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    State Key Laboratory of Natural Gas Hydrate, Beijing 100028, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China)

  • Caili Huang

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    State Key Laboratory of Natural Gas Hydrate, Beijing 100028, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    School of Energy Science and Technology, University of Science and Technology of China, Guangzhou 510640, China)

  • Dongliang Li

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    State Key Laboratory of Natural Gas Hydrate, Beijing 100028, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    School of Energy Science and Technology, University of Science and Technology of China, Guangzhou 510640, China)

  • Deqing Liang

    (Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
    State Key Laboratory of Natural Gas Hydrate, Beijing 100028, China
    Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China
    School of Energy Science and Technology, University of Science and Technology of China, Guangzhou 510640, China)

Abstract

CO 2 replacement is a promising method of gas hydrate recovery. However, the influence of residual water in the replacement process and selections of a suitable mining area remain uncertain. To better understand this method, we examined the influence of the particle size and initial hydrate saturation on the replacement process while using the same amount of residual free water. The results showed that during the replacement process, two stages of rapid reaction and slow reaction occurred, which were manifested by the speed of pressure change in the reactor. The CO 2 sequestration ratio decreased with the increase in sediment particle size and increased with the increase in initial hydrate saturation. During the replacement process, two reactions occurred: CH 4 was replaced by CO 2 and CO 2 hydrate was formed, and the replacement amount and recovery efficiency of CH 4 increased with a decrease in sediment particle size. When the sediment particle size was less than 166 μm, the CH 4 recovery efficiency was significantly affected by the particle size. The replacement amount of CH 4 increased with the increase in initial hydrate saturation, and the recovery efficiency decreased. This study provides a basis for selecting suitable hydrate-accumulation areas for on-site mining.

Suggested Citation

  • Fuqin Lu & Xuebing Zhou & Caili Huang & Dongliang Li & Deqing Liang, 2023. "Effect of Residual Water in Sediments on the CO 2 -CH 4 Replacement Process," Energies, MDPI, vol. 16(7), pages 1-16, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:7:p:3154-:d:1112541
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    References listed on IDEAS

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    1. Jyoti Shanker Pandey & Charilaos Karantonidis & Adam Paul Karcz & Nicolas von Solms, 2020. "Enhanced CH 4 -CO 2 Hydrate Swapping in the Presence of Low Dosage Methanol," Energies, MDPI, vol. 13(20), pages 1-30, October.
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    3. Ren, Liang-Liang & Jiang, Min & Wang, Ling-Ban & Zhu, Yi-Jian & Li, Zhi & Sun, Chang-Yu & Chen, Guang-Jin, 2020. "Gas hydrate exploitation and carbon dioxide sequestration under maintaining the stiffness of hydrate-bearing sediments," Energy, Elsevier, vol. 194(C).
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    Cited by:

    1. Gajanan, K. & Ranjith, P.G. & Yang, S.Q. & Xu, T., 2024. "Advances in research and developments on natural gas hydrate extraction with gas exchange," Renewable and Sustainable Energy Reviews, Elsevier, vol. 190(PB).

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