Abstract
Information about diffusion in solvent + bitumen/heavy oil mixtures is useful for the design of solvent‐assisted recovery processes as a key parameter in reservoir simulation models. Reliable mutual diffusion coefficient measurements for these systems present significant challenges. In this article, experimental techniques for the study of diffusion in liquid solvent + bitumen/heavy oil systems are critically reviewed, and the strengths and weaknesses of each method are highlighted. Despite considerable progress in this area with the application of state‐of‐the‐art techniques, such as X‐ray computer‐assisted tomography measurements, additional work is needed to measure the composition profiles in these opaque systems more precisely and to analyse the measured concentration profiles more conveniently.
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