Page 196 - PVT Property Correlations

170 PVT Property Correlations

Problem 3—Effect of Preknowledge of Bubble-Point Pressure
In Problem 2, assume that the correct value of the bubble-point pressure
(2635 psia) is known. Use this value and compute the solution GOR, forma-
tion volume factor, oil density, and oil viscosity for Standing (1947), Al-
Marhoun (1988), and McCain (1991) correlations at pressure of 1100 psia.
Compare the computed values with actual values.

Solution of Problem 3
Table 7.15 shows the calculated properties from the three correlations. The
laboratory-measured values are also given in the table. Table 7.16 shows the
absolute average percent error for the properties at pressure of 1100 psia
calculated from the three correlations when compared with the laboratory-
measured values.

TABLE 7.15 Problem 3 Solution Results
Fluid Property Laboratory Standing AlMarhoun McCain
Pressure, psia 1100 1100 1100 1100
Oil formation volume 1.28 1.48 1.21 1.26
factor, rbbl/STB
Solution GOR, scf/STB 374 258 219 358
Oil density, lbm/cu.ft 44.0 45.0 45.4 44.0
Oil viscosity, cp 0.54 0.44 0.46 0.33

TABLE 7.16 Problem 3 Solution Result Error
Fluid Property Standing (%) Al-Marhoun (%) McCain (%)
Pressure, psia 0 0 0
Oil formation volume factor, 16 2 5 2 1
rbbl/STB
Solution GOR scf/STB 2 31 2 41 2 4
Oil density, lbm/ft 3 2 3 0
Oil viscosity, cp 2 18 2 15 2 40