Dynamic measurements of methane hydrate formation/dissociation in different g...

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【文件名】 Dynamic measurements of methane hydrate formation/dissociation indifferent gas flow direction
【文件格式】 PDF
【页数】 7
【内容介绍】 Natural gas hydrate (NGH) is a clean energy with huge potential reserves. Therefore, it is essential to understandthe hydrate formation and dissociation characteristics for NGH production. Methane hydrate formation undergas migration condition was studied as pre-exploratory step for hydrate reformation research. Vessel pressurechanges, methane hydrate saturation (Sh) and residual aqueous water saturation (Sw) were measured andanalyzed in this study. Residual aqueous water distribution is also illustrated by magnetic resonance imaging(MRI). We found that, when Sw0 was higher than 0.4, the capillary force affected the aqueous water migrationmore than when Sw0 was lower than 0.4. Hence, Sh-max had a positive correlation with Sw0 when Sw0 is lowerthan 0.4. In addition, an upward methane flow is more likely to cause aqueous water redistribution than adownward methane flow. Moreover, we found that the aqueous water distribution changes could not recoverafter hydrate dissociation. Furthermore, the shifting of the hydrate dissociation boundaries from the vessel walltowards the core can be observed from the MRI images.
Keywords:Nature gas hydrate; Methane flow ;Aqueous water migration; MRI

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