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New prediction method for ultimate oil phase saturations

There is an increasing need, in the field of oil production, for a more accurate determination of the maximum amount of oil recoverable from a particular oil reservoir. The various reservoir models applied for this purpose require information or expressions on permeability and saturation as functions of the capillary pressures.

Most of the contemporary experimental procedures for determining the necessary relationships pertain to two-fluid systems. These two-fluid relationships (brine-oil, oil-gas) can then be used to estimate the fluid behaviour in three-fluid porous media based on the so-called Leverett concept. But this approach fails to consider spreading phenomena as they occur at the interfaces. This article deals with a modified Leverett concept that accounts for the effects of non-spreading behaviour of oils in three-fluid porous media.

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