The injected gas into an oil reservoir for EOR can finger into oil during diffusion. How does diffusivity value affect the degree and severity of fingering?
Does it occur in Gas Condensate Reservoirs during Enhanced Gas Recovery (EGR) through gas injection?
Normally, the diffussion coefficient is not expected to make significant affect on recovery.In fact it depends upon the location/perforations of the injection wells.As the distance between the injection wells and the production wells is relatively large resulting in gravity effect to be dominant rather than diffusion coefficient.
Fingering is usually an effect that occurs when a fluid of lower viscosity replaces a fluid of higher viscosity in a two-phase flow. It has to do with instabilities in macroscopic transport equations (Navier Stokes / Stokes / Hele -Shaw ...). I.e. fingering is related to macroscopic materials properties - not to molecular scale properties such as diffusion. The only relation is an indirect "coincidence". Low viscosity always implies high diffusivity by virtue of the Stokes-Einstein relation. but this does not imply any connection to the fingering phenomenon.
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