ENPE 251 Reservoir Fluid Properties
Winter 2016
Assignment No. 2: Winter 2016
Due: 2:00 PM on February 3, 2016
1. A gas is found to have the following composition.
Component
Methane
Ethane
Propane
i-Butane
n-Butane
Composition, mole fraction
0.870
0.049
0

Assignment No.3 (Ch. 4 Other Equations of State for Real Gases)
Q1: Please show that the following three relations can be derived for the van der Waals EOS (1873) from the behavior of a pure substance at its critical point (Pc-vMc-Tc):
and
Q2: Redo EXAMPL

ENPE 251 Reservoir Fluid Properties
Winter 2016
Assignment No. 7: Winter 2016
Due: 2:00 PM on April 6, 2016
1. One pound mole of a solution with composition given below at its bubble point of 200 psia and
160F is differentially vaporized to 100 psia and 1

ENPE 251 Reservoir Fluid Properties
Winter 2016
Assignment No. 2: Winter 2016
Due Date: 2:00 PM on February 3, 2016
1. A gas is found to have the following composition.
Component
Methane
Ethane
Propane
i-Butane
n-Butane
Composition, mole fraction
0.870
0.

ENPE 251 Reservoir Fluid Properties
Winter 2016
Assignment No. 1: Winter 2016
Due Date: 2:00 PM on January 27, 2016
1. Vapor pressure data of carbon dioxide are given below. Estimate the vapor pressure of carbon
dioxide at 50F.
Vapor Pressure of Carbon Di

ENPE 251 Reservoir Fluid Properties
Winter 2016
Assignment No. 3: Winter 2016
Due: 2:00 PM on February 10, 2016
1. A laboratory cell with volume of 0.008063 cu ft contains 0.03689 lb of methane. Temperature
is to be raised to 66F. Calculate the pressure t

ENPE 251 Reservoir Fluid Properties
Winter 2016
Assignment No. 4: Winter 2016
Due: 2:00 PM on February 24, 2016
1. A gas mixture has the following properties.
Component
Methane
Ethane
Propane
i- Butane
n-Butane
i- Pentane
n-Pentane
Hexanes
Heptanes plus
C

Assignment No. 1: Winter 2016
1. Vapor pressure data of carbon dioxide are given below. Estimate the vapor pressure of carbon
dioxide at 50F.
Vapor Pressure of Carbon
Dioxide
Temperature Vapor pressure,
, F
psia
-39.1
- 2.0
22.5
147.0
293.9
440.9
Question

1. A laboratory cell with volume of 0.008063 cu ft contains 0.03689 lb of methane. Temperature
is to be raised to 66F. Calculate the pressure to be expected with the van der Waals equation of state. Comp
V
m
0.008063 cu f
0.03689 lb
n
Vm
0.0023
3.505842 c

1. One pound mole of a solution with composition given below at its bubble point of 200 psia and
160F is differentially vaporized to 100 psia and 160F. Calculate the amount of gas vaporized. The composition is gi
Trial Values=
Component
Ethane
n-Butane
n-

5)
Co=
200x10^-6
1/psi
2)
W1=
W2=
Ppo/Pc3+
Density C3+
Ppo
Ppo Adjusted at 3385 psia
Ppo Adjusted at 3385 psia
and 205 F
Lab Measurement
% Error
7.96
4.96
0.87
49.78 lb/cu f
43.31 lb/cu f
44.51 lb/cu f
40.31 lb/cu f
39.46 lb/cu f
2.11
There is a 2.11% var

l. A sample of reservoir fluid is available for laboratory test. The following properties of the
reservoir and its fluid are known:
Volume of reservoir fluid: V = 60.465 cc Initial reservoir pressure: pi = 3500 psig Initial reservoir temperature
Design te

ENPE 251 Reservoir Fluid Properties
Winter 2016
Assignment No. 6: Winter 2016
Due: 2:00 PM on March 28, 2016
l. Your recently completed well is producing 42.0API oil and 0.856 specific gravity gas at 1000 scf/STB.
Producing gas-oil ratio has remained cons

ENPE 251 Reservoir Fluid Properties
Winter 2016
Assignment No. 5: Winter 2016
Due: 2:00 PM on March 14, 2016
l. A sample of reservoir fluid is available for laboratory test. The following properties of the
reservoir and its fluid are known:
Volume of rese

ENPE 251 Reservoir Fluid Properties
Winter 2017
Assignment No. 5: Winter 2017
Due Date: 2:00 PM on March 15, 2017
l. A sample of reservoir fluid is available for laboratory test. The following properties of the
reservoir and its fluid are known:
Volume of

ENPE 251 Reservoir Fluid Properties
Winter 2016
Assignment No. 1: Winter 2017
Due Date: 2:00 PM on January 25, 2017
1. Vapor pressure data of carbon dioxide are given below. Estimate the vapor pressure of carbon
dioxide at 40F.
Vapor Pressure of Carbon Di

ENPE 251 Reservoir Fluid Properties
Winter 2017
Assignment No. 6: Winter 2017
Due: 2:00 PM on March 27, 2017 (Monday)
l. Your recently completed well is producing 42.0API oil and 0.837 specific gravity gas at 1050 scf/STB.
Producing gas-oil ratio has rema

ENPE 251 Chapter 2
CHAPTER 2 PHASE BEHAVIOR
2.1 Introduction
Phase: Any homogeneous and physically distinct part of a system that is
separated from other parts or phases of the system by definite interfaces.
Example: ice, liquid water, water vapor. Three

ENPE 251 Chapter 3
CHAPTER 3 EQUATIONS OF STATE
Gas: A gas may be defined as a homogeneous fluid with low density
and viscosity, which has neither independent shape nor volume but
expands to fill completely the vessel, in which it is contained.
Equation o

ENPE 251 Chapter 4
CHAPTER 4 OTHER EQUATIONS OF STATE
FOR REAL GASES
Gas: A gas may be defined as a homogeneous fluid. Equation of State
(EOS): EOS is an equation that relates pressure to volume and
temperature (PVT or PvT relation) for a gas.
Two of thre

Homework #3 for ENPE 251 (Reservoir Fluids Properties)
Chapters 4 and 5
Q#1: Exercise 4-1. (10 marks)
Solution:
For neopentane:
Tc = 321.13 F = 781.13 R and Pc = 464.0 psia
So we have:
a=
27 R 2Tc 2
a = 63896.01
64 Pc
RTc
b=
b = 2.258
8Pc
Q#2: Exercise

Homework #4 for ENPE 251 (Reservoir Fluids Properties)
Chapter 6 and 7
Q#1: Exercise 6-1. (10 marks)
Solution:
Assume that the gas acts like an ideal gas at standard conditions.
V=
nRT 10.732 (60 + 460) 100
=
= 38070 scf
P
14.65
Q#2: Exercise 6-6. (10 mar

Homework #2 for ENPE 251 (Reservoir Fluids Properties)
Chapter 3
Q#1: Exercise 3-7. (25 marks)
Solution:
The bulk volume of sandstone = Vb = 1.3 cc
The pore volume of sandstone = V p
The volume of containers = V = 5 cc
The initial volume of gas = V1 = V V

ENPE 251 Reservoir Fluid Properties
Winter 2017
Assignment No. 4: Winter 2017
Due: 2:00 PM on February 15, 2017
1. A gas mixture has the following properties.
Component
Methane
Ethane
Propane
i- Butane
n-Butane
i- Pentane
n-Pentane
Hexanes
Heptanes plus
C

ENPE 251 Reservoir Fluid Properties
Winter 2017
Assignment No. 3: Winter 2017
Due: 2:00 PM on February 8, 2017
1. A laboratory cell with volume of 0.007563 cu ft contains 0.03489 lb of methane. Temperature
is to be raised to 100F. Calculate the pressure t

ENPE 251 Reservoir Fluid Properties
Winter 2017
Assignment No. 7: Winter 2017
Due: 2:00 PM on April 5, 2017
1. One pound mole of a solution with composition given below at its bubble point of 200 psia and
160F is differentially vaporized to 80 psia and 16