Residual oil saturation determined by several laboratory techniques on core plug specimens from a variety of lithologies in the Asia-Pacific region have been correlated to porosity, initial water saturation and permeability. To some extent, residual oil decreased with increasing initial water saturation and decreasing permeability. For the same mean hydraulic radius Kϕ residual oil left after gas-drive was much higher than that for a water-drive. On the average, residual oil saturation from steady-state water-oil relative permeability data were higher than those from the unsteady-state floods. This is an apparent reflection of the fact that steady-state floods are typically conducted at lower flow-rates than unsteady-state floods.

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