Investigating CO 2 Replacement for the Exploitation of Natural Gas Hydrates: Characteristics and Control Parameters

Yan Zhu (), Qun Zhang, Haiyan Jiang (), Guo Chen, Shibao Yuan and Zhe Wang
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Yan Zhu: School of Engineering Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
Qun Zhang: State Key Laboratory of Enhanced Oil and Gas Recovery, Beijing 100083, China
Haiyan Jiang: College of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China
Guo Chen: State Key Laboratory of Enhanced Oil and Gas Recovery, Beijing 100083, China
Shibao Yuan: College of Petroleum Engineering, Xi’an Shiyou University, Xi’an 710065, China
Zhe Wang: People’s Republic of China Petroleum & Chemical Corporation (Sinopec) Northwest Oilfield Branch, Urumqi 830011, China

Energies, 2025, vol. 18, issue 4, 1-21

Abstract: In response to escalating global energy demand and climate change mitigation needs, natural gas hydrates (NGHs) are gaining prominence as a clean energy source. The CO 2 replacement method is an innovative NGH extraction technique that reduces reservoir risks and enables CO 2 sequestration. However, our understanding of the dynamics and control parameters in the hydrate replacement process is limited. This study pioneers a kinetic analysis and conceptual model for a CO 2 -driven hydrate replacement, dividing the process into three spatial realms and sequential stages. We identify the optimal injection temperature range for standard NGH reservoirs and highlight the interplay between the gas injection rate and bottom-hole pressure on CH 4 yield. Our findings offer insights on how to optimize production efficiency and gas separation, advancing CO 2 replacement technology for NGHs.

Keywords: natural gas hydrates; CO 2 replacement method; numerical simulation; thermal conditions; pressure (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: 2025
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