Abstract
Summary This paper discusses the differences between fired Berea and reservoir-rock corefloods using an alkaline/polymer chemical system to recover an acidic California oil. Integrating Berea and reservoir-rock results was necessary in this study because of a limited supply of reservoir core material. Berea corefloods were adequate for initial screening and comparing different injection strategies but gave unrealistically high tertiary oil recoveries. Both sodium/hydrogen and sodium/calcium ion exchanges were higher in reservoir rock than in Berea. Higher alkali concentrations were required in the reservoir cores to prevent chromatographic separation of alkali and polymer. Excessive exchange of hardness ions was a major cause of lower oil recovery in reservoir corefloods. Recovery improved dramatically when extensive preflushing was used to remove hardness.
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