Page 124 - PVT Property Correlations

102 PVT Property Correlations

TABLE 5.11 Dew Point Correlation Terms (Problem 1 Solution)
Term1 Term2 Term3 Term4 Term5 Term6
4268.85 30.38 0.00 2 291.51 2 147.37 2 682.31

Term7 Term8 Term9 Term10 Term11 Term12
2 752.73 2 618.02 2 252.02 2 52.86 21.02 4712.54

Term13 Term14 Term15 Term16 Term17 Term18
29,967.96 2 5677.57 2 5963.32 2 21,380.79 175.99 18.35
Term19
96.65

TABLE 5.12 Results Comparison

Method Pressure, psia
Pd from laboratory data 3245.0
Pd from field data (Al-Dhamen and Al-Marhoun, 2011) 3974.3
Pd from composition (Elsharkawy, 2001) 3473.3

Table 5.12 summarizes the dew point calculation results.

Heat Content

The heat content calculations for any gas are the same. Therefore, the techni-
ques presented in Chapter 3, Dry Gases, are used to calculate the heat content
of gas condensates. However, it should be noted that in gas condensate opera-
tions, the gas that is sold is usually the separator gas (and not the well stream
gas). Therefore, the well stream composition or reservoir gas composition is
not typically used in heat content calculations. Although the produced gas
composition changes when the reservoir pressure declines below the dew point
pressure, the heat content of surface separator gas does not change signifi-
cantly. Fig. 5.9 is a plot of net heat content of a typical first stage gas pro-
duced from a gas condensate reservoir as a function of reservoir pressure.

Gas in Place Calculations for Gas Condensate Reservoirs

The volumetric calculations for gas in place in gas condensate reservoirs fol-
low exactly the same procedure for wet gases (explained in detail in