Electrical Resistivity Measurements of Methane Hydrate during N2/CO2 Gas Exchange

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• 作者：Dongwook Lim ; Hyeyoon Ro ; Young-ju Seo ; Joo Yong Lee ; Jaehyoung Lee ; Se-Joon Kim ; Youngjune ParkHuen Lee
• 刊名：Energy & Fuels
• 出版年：2017
• 出版时间：January 19, 2017
• 年：2017
• 卷：31
• 期：1
• 页码：708-713
• 全文大小：337K
• ISSN：1520-5029

文摘

Natural gas hydrates, known to exist in both continental margins and permafrost regions, have received tremendous attention, owing to their potential use as an unconventional natural gas resource. Among the options to develop natural gas hydrates, a gas exchange method using an external CO₂ or N₂/CO₂ mixture is considered one of the most promising technologies because (i) the process can prevent structural destruction of the gas hydrate deposits by swapping CO₂ or N₂/CO₂ for CH₄ molecules and (ii) injected CO₂, a global warming gas, can be sequestered and locked away through the formation of thermodynamically stable CO₂ or N₂/CO₂ hydrate. During and after N₂/CO₂ injection, however, the progress of gas exchange and the stability of the mixed CH₄/N₂/CO₂ hydrate must be monitored. In this study, the electrical resistivity of CH₄ hydrate before, during, and after N₂/CO₂ swapping was investigated using a lab-constructed tube-type reactor system for in situ electrical resistance measurement. The natural environment of a gas-hydrate-bearing sediment was simulated by forming CH₄ hydrate in the pore spaces of glass beads, and its electrical properties were examined. Finally, changes in electrical resistivity were used to interpret CH₄ recovery yields, while the guest composition of the gas hydrate was simultaneously analyzed by gas chromatography.