Using an aquifer as CO2 buffer storage

Abstract We investigate the prospect of using an offshore aquifer for both CO 2 sequestration and as buffer storage for CO 2 -based enhanced oil recovery (EOR), to reduce the cost of storage and increase flexibility and availability of the CO 2 . We review the state changes in the well, water content in back-produced CO 2 , pressure and temperature development of CO 2 in well and reservoir, for both injection and back-production. We find that although there is a small window for back-production, it places a high demand on operational stringency and will only deliver a small portion of the total CO 2 injected. Our conclusion is that such a project is only theoretically possible and is not recommended.

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