Abstract
The utility of capillary pressure curves can be extended to the evaluation of the fluid flow properties of rocks which provides another method for characterization of rocks. The capillary pressure hysteresis loop indicates wettability from infinitely water-wet to infinitely oil-wet by its position with respect to zero capillary pressure. The three-constant form of the hyperbola is a general expression for capillary pressure curves; hundreds of capillary pressure curves (from the literature and laboratory data) were represented by a hyperbolic function. The expression: (1) smooths laboratory data, (2) can be differentiated to obtain accurate calculation of the inlet saturation for centrifuge-derived data, (3) can be integrated for analysis of wettability and the energy required for fluid displacements, and (4) can be extrapolated to 100% single-phase saturation to obtain the correct threshold pressure.
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