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- W2008496423 abstract "Abstract Vapor Extraction (VAPEX) is a promising technique for the recovery of heavy oils and bitumen in reservoirs where thermal methods cannot be applied. In this work, the effects of dispersion and viscosity variation in the boundary layer of VAPEX on natural convection are studied. Natural convection may happen in VAPEX, if the solvents that are used to decrease oil viscosity, increase its density. This can occur with carbon dioxide-based solvents. The reduction of the oil viscosity due to solvent dissolution can have a large impact on the onset of convection, by decreasing the critical Rayleigh number by up to two orders of magnitude. The analysis shows that the longitudinal Peclet number does not have a significant impact on natural convention; however, the transverse Peclet number is a crucial parameter in determining the critical Rayleigh number. The wave number increases with the Rayleigh number, but decreases with the transverse Peclet number. When the effect of viscosity is included in the analysis of boundary layer instability in VAPEX, natural convection may occur in highly permeable reservoirs, leading to a greater oil production rate. The current models that are used to predict the oil production rate in VAPEX do not consider this effect and underestimate the oil production rate in case natural convection occurs." @default.
- W2008496423 created "2016-06-24" @default.
- W2008496423 creator A5062719249 @default.
- W2008496423 date "2013-04-19" @default.
- W2008496423 modified "2023-09-25" @default.
- W2008496423 title "Natural Convection in CO2-Based VAPEX" @default.
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- W2008496423 doi "https://doi.org/10.2118/165352-ms" @default.
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