Oil viscosity can be estimated with the correlations of Beggs and Robinson (1975) and Vasquez and Beggs (1980). The “dead” oil viscosity is
where
The oil viscosity at any other pressure below the bubble point is
where
If the stock tank oil viscosity is known, this value can be used for μod.
For pressures above the bubble point, the viscosity at the bubble point is first computed with Equations (3-19) through (3-25). Then
where
Gas viscosity can be estimated with the correlation that will be given in Chapter 4.
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