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Viscosity by correlation and graph
Suez University Cg by zp slope and Trube Graph
Faculty of Petroleum & Mining Engineering
Petroleum Engineering Department
Fluid Properties
2nd Year Students
H.W # 1
1- Assuming an ideal gas behavior, calculate the density of n-butane at 220°F
and 50 psia.
2- Show that :
yi = ∑
3-A gas has the following composition:
component yi
Co2 0.06
N2 0.03
C1 0.75
C2 0.07
C3 0.04
n-C4 0.03
n-C5 0.02
If the reservoir pressure and temperature are 2,500 psia and 175°F respectively,
calculate :
a. The gas density.
b. Isothermal gas compressibility coefficient.
c. The gas formation volume factor
4- A gas mixture has a density of 1.92 lb/ft3 at 500 psia and 100°F Calculate the
apparent molecular weight of the gas mixture.
5- A high-pressure cell has a volume of 0.33 ft3 and contains gas at 2,500 psia
and 130°F, at which conditions its z-factor is 0.75. When 43.6 scf of the gas are
Eng.Mohamed Elnoby Page 1
bled from the cell, the pressure dropped to 1,000 psia, the temperature remaining
at 130°F. What is the gas deviation factor at 1,000 psia and 130°F.
6- A hydrocarbon gas mixture with a specific gravity of 0.7 has a density of 9
lb/ft3 at the prevailing reservoir pressure and temperature. Calculate the gas
formation volume factor in bbl/scf.
7- A gas reservoir exists at a 150°F. The gas has the following composition
component yi
C1 0.89
C2 0.07
C3 0.04
The gas expansion factor Eg was calculated as 204.648 scf/ft3 at the existing
reservoir pressure and temperature. Calculate the viscosity of the gas.
8- A 20 ft3 tank at a pressure of 2,500 psia and 212°F contains ethane gas. How
many pounds of ethane are in the tank.
9-A hydrocarbon gas system has the following composition
component yi
C1 0.83
C2 0.06
C3 0.03
n-C4 0.02
n-C5 0.02
C6 0.01
C7+ 0.03
The heptanes-plus fraction is characterized by a molecular weight and specific
gravity of 161 and 0.81, respectively. Using Sutton’s methodology, calculate the
density of the gas 2000 psi and 150°F
Eng.Mohamed Elnoby Page 2