Page 48 - PVT Property Correlations

28 PVT Property Correlations

a. Classify this reservoir fluid.
b. What is the initial CGR?
c. During the production history of this field, the stock-tank liquid
gravity increased to 62 API and the producing gas oil ratio
increased according to the GOR plot. Does this information confirm
your classification? Why or why not?
d. Laboratory analysis of a sample from this reservoir gave the follow-
ing composition. Does this information confirm your classification?
Why or why not?
Component Composition (Mole Fraction)
0.0118
CO 2
0.0267
N 2
H 2 S 0.03500
C1 0.5827
C2 0.0952
C3 0.0624
C4 S 0.0312
0
C5 S 0.0297
0
C6 0.0158
C7 1 0.1095
1.000
Properties of heptanes plus
Specific gravity 0.834
Molecular weight 216 lb/lb mole
e. During the depletion of the reservoir, do you think the saturation
pressure was reached? If yes, when was it reached? Is it bubblepoint
or dew point pressure?