Oil viscosity can be estimated with the correlations of Beggs and Robinson (1975) and Vasquez and Beggs (1980). The “dead” oil viscosity is

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where

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The oil viscosity at any other pressure below the bubble point is

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where

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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

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where

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Gas viscosity can be estimated with the correlation that will be given in Chapter 4.


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