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Stock-Tank Oil Gravity, °API
Petrosky-Farshad*
Hanafy et al.
Vasquez-Beggs*
Dindoruk-Christman*
Bergman-Sutton*
* used Beggs-Robinson equations to calculate oil viscosity at bubblepoint pressure
Fig. 3-39. Average relative errors and average absolute relative errors of subsets of the data
described in table 3-26 sorted on stock-tank oil gravity show the quality of selected correlation
equations for estimating reservoir oil viscosities for pressures greater than bubblepoint pressure
across the full range of this independent variable
.
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