Homework Solutions Chapter 5
Homework Solutions Chapter 5
Homework Solutions Chapter 5
Volatile Oi
5.7 During the producing history of the field in Exercise 5-6 the stock-tank liquid
gravity steadily increased to 63o API, and the producing gas-oil ratio increased to
a maximum of 29,000 scf/STB. Does this information confirm your
classification? Why or why not?
5.8 Laboratory analysis of a sample from the reservoir of Exercise 5-6 gave the
following composition.
Component Composition
mole fraction
CO2 0.0218
N2 0.0167
C1 0.6051
C2 0.0752
C3 0.0474
C4 0.0412
C5 0.0297
C6 0.0138
C7+ 0.1491
1.0000
Properties of heptanes plus
Specific Gravity 0.799
Molecular weight 181 lb/lb-mole
The formation volume factor was about 2.6 res bbl/STB. Does this information confirm
your classification? Why or why not?
1
PETE 2032
Homework Solutions – Chapter 5
5.12 A discovery well produced during testing 46.6o API stock-tank liquid with a gas
rate of 2906 scf/STB. The stock-tank liquid was orange-brown. How would you
classify this reservoir fluid?
Volatile Oil
1750 +/- 150 > GOR . 3200 scf/STB
5.13 The reservoir fluid of Exercise 5-12 was sampled and the composition
determined.
Component Composition
mole fraction
CO2 0.0042
N2 0.0035
C1 0.6349
C2 0.1132
C3 0.0591
i-C4 0.0102
n-C4 0.0186
i-C5 0.0087
n-C5 0.0065
C6 0.0104
C7+ 0.1307
1.0000
Properties of heptanes plus
Specific Gravity 0.819
Molecular weight 212 lb/lb-mole