PROPERTIES OF BLACK OILS - Petroleum Reservoir Fluid Property Correlations - page 110

40

20

0

-20

-40

-60

-80

80

70

60

50

40

30

20

10

40 45 50 55 60

Density of Reservoir Oil, lb/ft 3

Ng-Egbogah Hanafy et al.

Beggs-Robinson
Dindoruk/Cristman

Petrosky-Farshad

Fig. 3-36. Average relative errors and average absolute relative errors of subsets of the data
described in table 3-24 sorted on reservoir oil density show the quality of selected correlation
equations for estimating reservoir oil viscosities for pressures equal to and less than bubblepoint
pressure across the full range of this independent variable.