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The Pressure-decay Method for Nature Convection Accelerated Diffusion of CO2 in Oil and Water Under Elevated Pressures

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The diffusion of CO2 into oil and water are studied experimentally. The solubility of CO2 in the oil-water mixture and the density of CO2-saturated liquid are measured, and the pressure-decay method is used to measure effective diffusivity of CO2 in oil and water. It is found that the solubility of CO2 in oil-water mixture can be determined by that of CO2 in oil and water, respectively. With the dissolution of CO2 into water and oil, concentration-induced density gradient causes natural convection and accelerates the diffusion process. The determined effective diffusivities are almost two orders of magnitude larger than the molecular diffusivities.
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Keywords: CO2; density; effective diffusivity; natural convection; solubility

Document Type: Research Article

Affiliations: Enhanced Oil Recovery Institute, China University of Petroleum, Beijing, China

Publication date: March 15, 2013

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