Accounting for Changing Oil Properties

The classical flowing material balance (FMB) analysis is performed under the assumption that the variation of oil properties (compressibility, viscosity, formation volume factor) with pressure is negligible; therefore this variation is not taken into account.

To account for the variation of oil properties with pressure, select the Changing Properties (Pseudo-Pressure) option. Calculations performed when this option is selected are based on using oil pseudo-pressure and are described in Accounting for Variation in Oil Properties. Calculations use the oil properties that are set in the Properties Editor.

If you chose to account for the variation in oil properties, you can also account for variation in rock properties (permeability and formation compressibility) with pressure. To do this, select the GeoMechanical option. Note that for the Oil FMB analysis, this option is only available when the Changing Properties (Pseudo-Pressure) option is selected. Calculations use the rock properties that are set in the Geomechanical section of the Properties Editor.