Effects of soaking process on CH4-CO2 replacement efficiency for hydrate-bearing sediments

• Published in: Journal of Petroleum Science and Engineering
• Main Authors: Ryou, Jae Eun, Al-Raoush, Riyadh I., Alshibli, Khalid, Lee, Joo Yong, Jung, Jongwon
• Format: Article in Journal/Newspaper
• Language: English
• Published: Elsevier
• Subjects: Carbon dioxide; Costs; Efficiency; Gas hydrates; Hydration; Dynamic replacement; Hydrate bearing sediments; Production efficiency; Rate of replacement; Replacement methods; Sediment stability; Sequestering carbon; Thermal stimulation; Carbon dioxide process; cost analysis; fluid injection; gas hydrate; hydrocarbon resource; methane; Methane hydrate
• Online Access: http://hdl.handle.net/10576/43859; https://doi.org/10.1016/j.petrol.2020.107772

CH4-CO2 replacement method has the advantages of sequestering carbon dioxide and sediment stability compared to other methods such as depressurization and thermal stimulation. However, the production efficiency using CH4-CO2 replacement method is lower than any other method. In this study, effects of soaking process on CH4-CO2 replacement efficiency were determined. The soaking process was the time to close all valves for the enhancement of CH4-CO2 reaction which resulted in the long reaction time between the injected CO2 and methane hydrate and consisted of the 1st and the 2nd production with soaking time after dynamic replacement. Results showed that total replacement efficiency increased with increasing number of soaking processes and more soaking time. The increasing rate of replacement efficiency in the first soaking process was higher than that in the second process. However, the soaking process showed the disadvantage that the total production time increased with increasing soaking time and process, which could result in the production cost increase. Therefore, appropriate soaking time and number of soaking processes are required to improve the replacement efficiency considering production cost. 2020 The Authors This research was made possible by an NPRP grant # NPRP8-594-2-244 from the Qatar National Research Fund (a member of Qatar Foundation ). And this work was supported by the National Research Foundation of Korea( NRF ) grant funded by the Korea government ( MSIT ) ( 2020R1A2C101235211 ). Also, this research was partially supported by the Ministry of Trade, Industry, and Energy ( MOTIE ) through the Project "Gas Hydrate Exploration and Production Study ( 20-1143 )" under the management of the Gas Hydrate Research and Development Organization (GHDO) of Korea and the Korea Institute of Geoscience and Mineral Resources (KIGAM). Also, this research was supported by a grant ( 2018-MOIS31-009 ) from Fundamental Technology Development Program for Extreme Disaster Response funded by Korean Ministry of ...