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Asphaltene expulsion appears to be an important mechanism in the formation of a heavy oil layer and/or a tar mat at the base of an oil column during gas charges. To better understand this dynamic process, a multicomponent diffusion model has been developed to simulate the diffusion during gas charge processes in oil reservoirs. In this model, a complex moving boundary diffusion problem has been converted...
A reservoir crude oil consists of dissolved gas, liquid and dissolved solid (asphaltenes). It is well known that asphaltene solubility in oil decreases with an increase in solution gas content (gas/oil ratio, GOR). For example, a late gas charge into a reservoir crude oil over geologic time can cause asphaltene instability and phase separation to form a tar mat. This tar mat is often spatially separated...
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