Experimental Study on the Distribution Characteristics of CO 2 in Methane Hydrate-Bearing Sediment during CH 4 /CO 2 Replacement

Jianye Sun, Xiluo Hao, Chengfeng Li, Nengyou Wu, Qiang Chen, Changling Liu, Yanlong Li, Qingguo Meng, Li Huang and Qingtao Bu
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Jianye Sun: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
Xiluo Hao: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
Chengfeng Li: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
Nengyou Wu: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
Qiang Chen: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
Changling Liu: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
Yanlong Li: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
Qingguo Meng: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
Li Huang: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China
Qingtao Bu: Key Laboratory of Gas Hydrate, Ministry of Natural Resources, Qingdao Institute of Marine Geology, Qingdao 266237, China

Energies, 2022, vol. 15, issue 15, 1-14

Abstract: CH 4 /CO 2 replacement is of great significance for the exploitation of natural gas hydrate resources and CO 2 storage. The feasibility of this method relies on our understanding of the CH 4 /CO 2 replacement efficiency and mechanism. In this study, CH 4 /CO 2 replacement experiments were carried out to study the distribution characteristics of CH 4 and CO 2 in hydrate-bearing sediments during and after replacement. Similar to previously reported data, our experiments also implied that the CH 4 /CO 2 replacement process could be divided into two stages: fast reaction and slow reaction, representing CH 4 /CO 2 replacement in the hydrate-gas interface and bidirectional CH 4 /CO 2 diffusion caused replacement, respectively. After replacement, the CO 2 content gradually decreased, and the methane content gradually increased with the increase of sediment depth. Higher replacement percentage can be achieved with higher replacement temperature and lower initial saturation of methane hydrate. Based on the calculation of CO 2 consumption amounts, it was found that the replacement mainly took place in the fast reaction stage while the formation of CO 2 hydrate by gaseous CO 2 and water almost runs through the whole experimental process. Thus, the pore scale CH 4 /CO 2 replacement process in sediments can be summarized in the following steps: CO 2 injection, CO 2 diffusing into sedimentary layer, occurrence of CH 4 /CO 2 replacement and CO 2 hydrate formation, wrapping of methane hydrate by mixed CH 4 -CO 2 hydrate, continuous CO 2 hydrate formation, and almost stagnant CH 4 /CO 2 replacement.

Keywords: CH 4 /CO 2 replacement; gas hydrate; distribution characteristics (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: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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