A number of experimental studies have focused on the properties of the porous medium and the fluids contained therein at elevated pressures and temperatures. Rock properties which appear to be affected by the pressure and temperature levels include permeability, porosity, and compressibility. Single phase fluid properties of interest include viscosity, density, compressibility, and vapor pressure. Fundamental properties which govern the behavior of multiple phases include surface tension and wettability. Finally, two properties which are used to represent multiple fluid phase behavior in the porous medium are capillary pressure and relative permeability.

Methods exist for measuring rock properties for various rock types, bulk properties of single phase fluids, and the properties of multiple contacting phases as functions of pressure and temperatures. Capillary pressure curves and relative permeability data are then determined for reservoir conditions using additional experimental measurements and calculations based on the measured rock and fluid properties. However, certain experimental results suggest that the fluid and rock properties may be affected by the particular rock-fluid combination.

In this paper, experimental results from several major studies and the interpretations offered are examined in detail. Since the interpretation for one set of results have frequently been inconsistent with results of related experiments, a unified theory is sought.

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