Page 103 - PVT Property Correlations

Wet Gases Chapter | 4 81

TABLE 4.11 Reservoir and Fluid Parameters for the Two Samples
Parameter Unit Reservoir 1 Reservoir 2
Fluid sample Sample 1 Sample 2
Initial reservoir pressure psia 10,000 5498
Reservoir temperature F 204 290
Total producing GOR scf/STB 14,325 63,695
Reservoir area ac 12,000 10,000
Average reservoir net pay thickness ft 35 40
Average porosity Fraction 0.18 0.23
Average initial water saturation Fraction 0.32 0.19
GOR, gas oil ratio.

f g G T
N 5 ð4:14Þ
R t
The fraction of the total initial gas in place that will be produced in the
gaseous phase at the surface is calculated from Eq. 4.15.

R t
f g 5 ð4:15Þ
R t 1 132; 800γ =M o
o

Problem 4—Calculating Hydrocarbon in Place for Wet Gases
The two fluid samples above were taken from two different reservoirs with
the basic reservoir data given in Table 4.11. Estimate the total initial gas in
place, the fraction of the total initial gas in place that will be produced in the
gaseous phase, and the initial oil (condensate) in place.

Solution of Problem 4
By use of the following volumetric calculation for total initial gas in place
(Eq. 4.16), the total (gas with the vaporized condensate) gas in place can be
calculated.

7758 Ah ø1 2 S wi Þ
ð
G T 5 ð4:16Þ
B gi
As an example calculation for Reservoir 1:
ð
ð 7758Þ 12; 000Þ 35Þ 0:18Þð1 2 0:32Þ 11
ð
ð
G T 5 5 1:4 3 10 scf 5 0:14 tcf
0:00284