Page 131 - PVT Property Correlations

108 PVT Property Correlations

TABLE 5.17 Calculations of Liquids Recovery from Separator Gas of
Problem 1
Efficiency (%) Liquid Content Recovery
GPM STB/MMscf
Ethane 25 0.617 14.7
Propane 70 0.731 17.4
Butanes 100 0.586 14.0
C5 1 100 2.573 61.3

Using the assumed efficiencies for ethane, propane, butanes, and pentanes
plus recovery, the liquid recovery is calculated and Table 5.17 summarizes
the results.

Estimation of Modified Black Oil PVT Properties for Gas
Condensates

As explained above, MBO approach can be adequate for modeling phase
changes in many gas condensate fluids. The following example gives the
details of estimating MBO properties from correlations for a typical gas con-
densate fluid.

Problem 4—Calculation of Modified Black Oil PVT Properties
for Gas Condensate
The field information is available for the gas condensate of Problem 1, where
the initial producing oil gas ratio is 230 STB/MMscf. First and second sepa-
rator gas specific gravities are 0.786 and 0.788, respectively. Use Nassar
et al. (2013) gas condensate correlations to calculate dew point pressure, oil
and gas formation volume factors, solution gas oil ratio, and vaporized
oil gas ratio as functions of pressure. Plot the calculated MBO PVT
properties.

Solution of Problem 4
Using the gas condensate saturation pressure (dew point) correlation,