Page 94 - PVT Property Correlations

72 PVT Property Correlations

TABLE 4.3 Compositional Information Data for the Two Example Fluids
Component Mole %

Sample 1 Sample 2
N 2 0.49 2.3
6.36 7.82
CO 2
C1 72.79 77.6
C2 9.28 7.41
C3 3.81 2.08
i-C4 0.78 0.44
n-C4 1.16 0.48
i-C5 0.44 0.18
n-C5 0.37 0.17
C6 1 0.16
C7 1 3.53 1.36
C7 1 molecular
Weight 163.48 144.7
C7 1 specific
Gravity 0.81 0.78

in the laboratory. This information (except for C7 1 properties) is usually
readily available in the field. Notice that Sample 1 is considered gas conden-
sate by the criteria presented in the Reservoir-Fluids Classification Chapter.

Problem 1—Calculation of Wet Gas Specific Gravity

For the two gases given in Table 4.3, calculate the gas specific gravity from
gas composition, CGR, and separator conditions. Additional information is
provided in Table 4.4.

Solution of Problem 1
Investigating the data in Tables 4.3 and 4.4 shows that we can calculate the
gas specific gravity from composition, CGR, and knowledge of separator
conditions using the practical approach.