Abstract
This study is conducted to investigate the roles of capillarity and drainage height on mass transfer phenomena during the VAPEX process in heavy oil reservoirs. A comprehensive experimental study was conducted in two 2-D slab models using Plover Lake oil from west-central Saskatchewan and n-butane as the solvent. This study revealed significant effects of drainage height and capillarity on oil drainage rates in contrast to previous studies conducted at unrealistically high permeabilities (i.e., >200 D). A new correlation was developed to predict the effective diffusion/dispersion coefficient from solvent concentration, drainage height, and total pore surface area of the porous media.
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