Large-Scale Experimental Investigation of Hydrate-Based Carbon Dioxide Sequestration

Weixin Pang (), Yang Ge, Mingqiang Chen (), Xiaohan Zhang, Huiyun Wen, Qiang Fu, Xin Lei, Qingping Li and Shouwei Zhou
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Weixin Pang: State Key Laboratory of Offshore Natural Gas Hydrate, Beijing 100028, China
Yang Ge: State Key Laboratory of Offshore Natural Gas Hydrate, Beijing 100028, China
Mingqiang Chen: State Key Laboratory of Offshore Natural Gas Hydrate, Beijing 100028, China
Xiaohan Zhang: State Key Laboratory of Offshore Natural Gas Hydrate, Beijing 100028, China
Huiyun Wen: State Key Laboratory of Offshore Natural Gas Hydrate, Beijing 100028, China
Qiang Fu: State Key Laboratory of Offshore Natural Gas Hydrate, Beijing 100028, China
Xin Lei: State Key Laboratory of Offshore Natural Gas Hydrate, Beijing 100028, China
Qingping Li: State Key Laboratory of Offshore Natural Gas Hydrate, Beijing 100028, China
Shouwei Zhou: State Key Laboratory of Offshore Natural Gas Hydrate, Beijing 100028, China

Energies, 2024, vol. 17, issue 13, 1-17

Abstract: Hydrate-based CO 2 sequestration is a novel approach that can not only realize permanent CO 2 sequestration but can also form an artificial cap to prevent its upward migration. In this work, a self-developed large-scale 3D apparatus was employed to investigate hydrate formation characteristics in hydrate-based CO 2 sequestration at a constant liquid CO 2 injection rate through a vertical well for the first time. Temperature and pressure evolutions in the sediment were analyzed in detail. Key indicators, including cumulative sequestered CO 2 , CO 2 in hydrate and liquid phases, the instantaneous hydrate conversion, and liquid CO 2 retention rates, were calculated. The results show that hydrate continuously forms with increased CO 2 injection and exhibits strong heterogeneity due to the variation in hydrate formation rate and quantity. Severe liquid CO 2 heterogeneous figuring phenomena occur since hydrate deteriorates the effective pore structure and topology, resulting in relatively small cumulative sequestered CO 2 when a large amount of CO 2 is released from the outlet. Meanwhile, the instantaneous hydrate conversion and liquid CO 2 retention rates have large fluctuations owing to water consumption and variation in the effective contact area between liquid CO 2 and water. However, hydrate formation does not cause blockage of wellbore and formation nearby under given experimental conditions, which is beneficial for hydrate formation in deeper sediment. This study provides insights into hydrate formation and liquid CO 2 immigration regularity during hydrate-based CO 2 sequestration and demonstrates its feasibility at a field scale.

Keywords: hydrate-based CO 2 sequestration; CO 2 hydrate formation characteristics; cumulative sequestered CO 2; instantaneous hydrate conversion rate; liquid CO 2 retention rate (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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