PROPERTIES OF BLACK OILS - Petroleum Reservoir Fluid Property Correlations - page 109

30

20

10

0

-10

-20

-30

50

45

40

35

30

25

20

15

120 140 160 180 200 220 240 260 280

Reservoir Temperature, °F

Ng-Egbogah
Beggs-Robinson
Dindoruk-Christman

Hanafy et al.
Petrosky-Farshad

Fig. 3-35. Average relative errors and average absolute relative errors of subsets of the data
described in table 3-24 sorted on reservoir temperature 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.