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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Investigation on the Process of CO2 Diffusion and Mass Transfer in Oil-saturated Porous Media Using MRI

Get access (open in a dialog) DOI: 10.1615/IHTC15.ees.008662
pages 2179-2187

Sinopsis

The method of injecting CO2 into depleted or low permeability reservoirs is an effective way for enhanced oil recovery and geological CO2 storage. Mass transfer is the first mechanism to occur when CO2 is injected into the reservoirs. In order to effectively evaluate CO2 flooding efficiency and underground storage safety, it's necessary to study the process of CO2 diffusion and mass transfer in the oil. In this study, the dualchamber pressure decay method and magnetic resonance imaging (MRI) were used to dynamically visualize the CO2 diffusion process in oil-saturated porous media, and the relations of concentration-distance for CO2 diffusing into oil at different times for CO2-oil system were obtained by quantitative analysis. A non-iterative finite volume method was successfully applied to calculate the diffusion coefficient of CO2 in oil-saturated porous media. The results agree very well with the conventional pressure decay method in binary mixtures. According to the experimental and calculating results, it is found that the CO2 concentration gradually declines along the diffusion direction, and the CO2 concentration at later times are higher than the CO2 concentration at early time during the process of CO2 diffusion in oil-saturated porous media.