Page 164 - PVT Property Correlations

138 PVT Property Correlations

FIGURE 6.15 Oil density calculated using the different correlations compared to the
laboratory-measured oil density.

Problem 2—Calculation of Modified Black-Oil PVT Properties for
Volatile Oil

A volatile oil fluid at reservoir temperature of 232 F has stock-tank oil spe-
cific gravity of 0.83 and separator gas specific gravity of 0.828. Initial pro-
ducing GOR is 2833 scf/STB for a three-stage separation system. Primary

separator pressure is 232 psi and separator temperature is 110 F, while sec-
ondary separator pressure and temperature are 70 psi and 70 F, respectively.

The stock-tank is at standard pressure and temperature. Use Nassar et al.
(2013) volatile oil correlations to calculate bubble point pressure, oil and gas
formation volume factors, solution GOR, and vaporized oil gas ratio as
function of pressure. Plot the calculated MBO PVT properties.
Solution of Problem 2
Using Nassar et al. (2013) volatile oil saturation pressure correlation (bubble
point pressure):
A1 A2 A3 A4
P sat 5 A 0 3 R si 3 X1YÞ 3 STO 3 Tr
ð
SG1
X 5
P sep1
ð6:1Þ
SG2
Y 5
P sep2