PROPERTIES OF BLACK OILS - Petroleum Reservoir Fluid Property Correlations - page 117

20

10

0

-10

-20

-30

-40

-50

70

60

50

40

30

20

0 200 400 600 800 1000 1200

Solution Gas-Oil Ratio at Bubblepoint Pressure, scf/STB

Petrosky-Farshad*
Hanafy et al.
Vasquez-Beggs*

Dindoruk-Christman
Bergman-Sutton*

* used Beggs-Robinson equations to calculate oil viscosity at bubblepoint pressure

Fig. 3-40. Average relative errors and average absolute relative errors of subsets of the data
described in table 3-26 sorted on solution gas-oil ratio at bubblepoint pressure 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.