Session:___________ Name: ______________________________________

PETE 310 Exam 1 1/10

PETROLEUM ENGINEERING 310

FIRST EXAM

September 19, 2001 Do all your work on the test paper and the space provided for the answer, do no write on the back. Grading will be based on approach and answers. Remember to show all your work!!!! Answers with no evidence of calculations where they are required will not be graded. The point value of each question or problem is given in parentheses after the question or problem statement. Do not fold or unstaple the examination booklet. Time allotted for the test is 120 minutes. Only interpretation questions are allowed. This examination is closed book, closed notes, and closed mouth. Statement When you have finished the exam. Read and sign the statement below, then return in the examination booklet. I pledge that I have neither given nor received aid in completing this exam. I have followed the strictures of the Texas A&M University Aggie Code of honor during this exam. Signature: ___________________________________________

Session:___________ Name: ______________________________________

PETE 310 Exam 1 2/10

2

1. Explain the process of covalent bonding and give one example of covalent bonding

(4 pts).

2. Define and give an example of an extensive property (4 pts).

3. Define normal boiling point (4 pts).

4. Name the following chemicals using the IUPAC rules (4 pts)

CH3CH2

CH2C

CCH3 _____________________________________

CH3

CHCH2

CH3

CH3 _____________________________________

CH2

CH

CH2

CH2

CH2

CH2 CH

CH3

CH3

___________________________________

CH

C

CH

CH

CH

CH CH2CH3 ___________________________________

Session:___________ Name: ______________________________________

PETE 310 Exam 1 3/10

3

5. Describe the homologous series alkanes (4 pts)

6. List 3 non-hydrocarbon components of reservoir fluids and describe their

importance in industrial processes. (4 pts)

7. List the most current rules of thumb" by which a gas condensate oil can be

identified from production data. (4 pts)

Session:___________ Name: ______________________________________

PETE 310 Exam 1 4/10

4

8. The following diagram shows the vapor pressures for three different substances A, B and C. Respond the following questions:

a. What is the state of A at p=200 psia? (2 pts)

b. What is the saturation pressure of A, B and C at T = 150F? (3 pts)

c. What is the saturation temperature of A, B, and C at p=200 psia? (3 pts)

d. Which one is the heaviest component and why. (2 pts)

Mark all the points in the graph

400 35030025020015010050 0 -50 -100 0

20 40 60 80

100 120 140 160 180 200 220 240 260 280 300

Temperature (oF)

Pres

sure

(psia

)

A

B

C

Session:___________ Name: ______________________________________

PETE 310 Exam 1 5/10

5

9. A 3 ft3 cylinder is evacuated and filled with thirty pounds (30 lbm) of propane at 65 oF.

If the densities of the liquid and the vapor are 28.94 lbm/ft3 and 1.07 lbm/ft

3. Evaluate.

(a) Volumetric fraction of liquid propane In the container (6 pts)

(b) Mass fraction of liquid propane. (5 pts)

Session:___________ Name: ______________________________________

PETE 310 Exam 1 6/10

6

12. Given the following Information sketch a pressure-volume diagram for ethane showing clearly the two-phase region, the critical isotherm, the -7.0oF isotherm, and a supercritical isotherm. Label all points and pertinent regions completely. (10 pts) Data: Vc = 0.0783 ft3/lbm Gas Saturation Volume at -7.0oF Vg= 0.65 ft3/lbm

Pressure -Volume Diagram for Ethane

0

100

200

300

400

500

600

700

800

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

V (ft3/lbm)

Pres

sure

(psi

a)

Vapor Phase Liquid Phase

Pressure Temperature Diagram for Ethane

0

100

200

300

400

500

600

700

800

-250 -200 -150 -100 -50 0 50 100 150

Temperature(oF)

Pres

sure

(psi

a)

Pressure -Volume Diagram for Ethane

0

100

200

300

400

500

600

700

800

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

V (ft3/lbm)

Pres

sure

(psi

a)

Vapor Phase Liquid Phase

Pressure Temperature Diagram for Ethane

0

100

200

300

400

500

600

700

800

-250 -200 -150 -100 -50 0 50 100 150

Temperature(oF)

Pres

sure

(psi

a)

Session:___________ Name: ______________________________________

PETE 310 Exam 1 7/10

7

13. Using the information presented in the following diagram sketch a pressure composition diagram for T= 80oF and T= 200oF. (10 pts) Label completely.

0

100

200

300

400

500

600

700

800

900

1000

0 50 100 150 200 250 300

Temperature oF

Pres

sure

(psi

a)

0

100

200

300

400

500

600

700

800

900

1000

0 10 20 30 40 50 60 70 80 90 100

Composition of ____ %

Pres

sure

(psi

a)

A

B

0

100

200

300

400

500

600

700

800

900

1000

0 50 100 150 200 250 300

Temperature oF

Pres

sure

(psi

a)

0

100

200

300

400

500

600

700

800

900

1000

0 10 20 30 40 50 60 70 80 90 100

Composition of ____ %

Pres

sure

(psi

a)

A

B

Session:___________ Name: ______________________________________

PETE 310 Exam 1 8/10

8

14. Consider the temperature composition diagram (below) of C3/n-C6 systems at p=200 psia.

Temperature Composition Diagram for C3/n-C6 at P=200 psia

0

50

100

150

200

250

300

350

400

0 10 20 30 40 50 60 70 80 90 100

Propane, Mole %

Tem

pera

ture

, o F

Finish labeling this graph and complete the following table using information given In the diagram. (4 pts) System Td Pd Tb Pb 0.4 C3/0.6n-C6 0.0 C3/1.0 n-C6 A liquid mixture of 60% mole of C3 is heated at constant pressure to T=200oF. Indicate the compositions of the gas and liquid formed and the molar percentage that vaporized (6 pts)

z3 y3 x3 fv (nv/nt) T = 200oF p = 200psia 0.5

Session:___________ Name: ______________________________________

PETE 310 Exam 1 9/10

9

15. Given the following ternary phase diagram for mixtures of methane, n-butane and n-decane at 180oF and 2000 psia, answer the following questions. a. Locate on the diagram a mixture of 20% methane, 10% n-butane and 70%

n-decane. (2 pts) b. Estimate the composition of equilibrium liquid and gas if 100 moles of the

mixture from part (a) are mixed with 200 moles of a mixture with 80% C1 and 20 % n-C4 and brought to equilibrium at 180oF and 2000 psia. (6 pts)

Mixture C1 / nC4 / nC10@ p=2000 psia, T=180 F

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Mixture C1 / nC4 / nC10@ p=2000 psia, T=180 F

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

Mixture _____________ % C1 ______________ % n-C4 ______________ % n-C10 Gas ______________ % C1 ______________ % n-C4 ______________ % n-C10 Liquid ______________ % C1 ______________ % n-C4 ______________ % n-C10

Session:___________ Name: ______________________________________

PETE 310 Exam 1 10/10

10

c. Calculate the fraction of the mixture described in part (b) that is gas and the fraction of the mixture that is liquid. (5 pts)

Gas Liquid 8. Assume the following gas mixture behaves like an ideal gas. Calculate the

mass and specific gravity of the gas mixture which is contained in a 1.5 ft3 container at 100oF and 200 psia. (R=10.72 psia ft3/oR-lb-mole)

Component

Composition (mole fraction)

methane (C1) 0.80 ethane (C2) 0.10

propane (C3) 0.10