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Enhanced oil recovery techniques - petrofed.winwinho...

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PRIMARY AND SECONDARY RECOVERYAfter primary and secondary <strong>recovery</strong> (waterflood) <strong>oil</strong>remains in the reservoir as: uncontacted (unswept) <strong>oil</strong> (So = 1 - Swi) partially removed <strong>oil</strong> (1 - Swi < So > Soi) residual <strong>oil</strong> (So = Soi)Secondary and tertiary <strong>recovery</strong> are together referred toas enhanced <strong>oil</strong> <strong>recovery</strong> (EOR).

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