SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2024, Vol. 67 ›› Issue (3): 126-134.DOI: 10.1016/j.cjche.2023.09.016

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Enhanced gas production and CO2 storage in hydrate-bearing sediments via pre-depressurization and rapid CO2 injection

Hongnan Chen1, Yifei Sun1, Bojian Cao1, Minglong Wang1, Ming Wang1, Jinrong Zhong2, Changyu Sun1, Guangjin Chen1   

  1. 1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
    2 School of Chemistry and Chemical Engineering, Changsha University of Science & Technology, Changsha 410114, China
  • 收稿日期:2023-07-19 修回日期:2023-09-08 出版日期:2024-03-28 发布日期:2024-06-01
  • 通讯作者: Yifei Sun,E-mail address:sun.yifei@cup.edu.cn.
  • 基金资助:
    This work was financially supported by the National Natural Science Foundation of China, China (22378424, 52004136, 22127812, U20B6005), the Science Foundation of China University of Petroleum Beijing (2462023BJRC017), and Hunan Provincial Department of Education Scientific Research Project (22B0310).

Enhanced gas production and CO2 storage in hydrate-bearing sediments via pre-depressurization and rapid CO2 injection

Hongnan Chen1, Yifei Sun1, Bojian Cao1, Minglong Wang1, Ming Wang1, Jinrong Zhong2, Changyu Sun1, Guangjin Chen1   

  1. 1 State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China;
    2 School of Chemistry and Chemical Engineering, Changsha University of Science & Technology, Changsha 410114, China
  • Received:2023-07-19 Revised:2023-09-08 Online:2024-03-28 Published:2024-06-01
  • Contact: Yifei Sun,E-mail address:sun.yifei@cup.edu.cn.
  • Supported by:
    This work was financially supported by the National Natural Science Foundation of China, China (22378424, 52004136, 22127812, U20B6005), the Science Foundation of China University of Petroleum Beijing (2462023BJRC017), and Hunan Provincial Department of Education Scientific Research Project (22B0310).

摘要: Carbon emission reduction and clean energy development are urgent demands for mankind in the coming decades. Exploring an efficient CO2 storage method can significantly reduce CO2 emissions in the short term. In this study, we attempted to construct sediment samples with different residual CH4 hydrate amounts and reservoir conditions, and then investigate the potentials of both CO2 storage and enhanced CH4 recovery in depleted gas hydrate deposits in the permafrost and ocean zones, respectively. The results demonstrate that CO2 hydrate formation rate can be significantly improved due to the presence of residual hydrate seeds; However, excessive residual hydrates in turn lead to the decrease in CO2 storage efficiency. Affected by the T-P conditions of the reservoir, the storage amount of liquid CO2 can reach 8 times that of gaseous CO2, and CO2 stored in hydrate form reaches 2-4 times. Additionally, we noticed two other advantages of this method. One is that CO2 injection can enhance CH4 recovery rate and increases CH4 recovery by 10%-20%. The second is that hydrate saturation in the reservoir can be restored to 20%-40%, which means that the solid volume of the reservoir avoids serious shrinkage. Obviously, this is crucial for protecting the goaf stability. In summary, this approach is greatly promising for high-efficient CO2 storage and safe exploitation of gas hydrate.

关键词: Hydrate, Depressurization, CO2 storage, CH4 production, Reservoir remediation

Abstract: Carbon emission reduction and clean energy development are urgent demands for mankind in the coming decades. Exploring an efficient CO2 storage method can significantly reduce CO2 emissions in the short term. In this study, we attempted to construct sediment samples with different residual CH4 hydrate amounts and reservoir conditions, and then investigate the potentials of both CO2 storage and enhanced CH4 recovery in depleted gas hydrate deposits in the permafrost and ocean zones, respectively. The results demonstrate that CO2 hydrate formation rate can be significantly improved due to the presence of residual hydrate seeds; However, excessive residual hydrates in turn lead to the decrease in CO2 storage efficiency. Affected by the T-P conditions of the reservoir, the storage amount of liquid CO2 can reach 8 times that of gaseous CO2, and CO2 stored in hydrate form reaches 2-4 times. Additionally, we noticed two other advantages of this method. One is that CO2 injection can enhance CH4 recovery rate and increases CH4 recovery by 10%-20%. The second is that hydrate saturation in the reservoir can be restored to 20%-40%, which means that the solid volume of the reservoir avoids serious shrinkage. Obviously, this is crucial for protecting the goaf stability. In summary, this approach is greatly promising for high-efficient CO2 storage and safe exploitation of gas hydrate.

Key words: Hydrate, Depressurization, CO2 storage, CH4 production, Reservoir remediation