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Session:___________ Name: ________________________________
B
PETROLEUM ENGINEERING 310
FIRST EXAM
September 22, 2000
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 un staple the examination booklet.
Time allotted for the test is 120 minutes.
This examination is closed book, closed notes, and closed mouth. Only interpretation questions to the instructor are allowed.
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: ___________________________________________
2 of 13
- Explain the process of ionic bonding and give one example of ionic bonding. (5)
- Write down the molecular structure of each one of the following compounds (5)
2-methylheptane
2-methyl 1- pentene
3,3 dimethyl 1-pentyne
Ethylcyclohexane
Methylbenzene
4 of 13
- List the rules of thumb by which a volatile oil can be identified from production data. (5)
- Define Cricondenbar and Cricondentherm and Bubble Point. (2)
- Using the COX chart in the following page determine the following properties for propane. Indicate the points in the diagram as well.
a. Saturation pressure for propane at 100 o^ F
5 of 13
Psat = _______psia
b. Critical point
Pc ______ psia Tc= _________ o^ F
c. State (liquid, gas or two-phase) of propane at 50o^ F and 150 psia and
at 60 psia and 50 o^ F (5)
7 of 13
- Using the following graph, which shows phase equilibrium data for methane and normal butane (C1 /n-C4) at 220 o^ F, indicate the following:
(a) Bubble point pressure for a mixture of 20% C1 (2.5)
(b) Approximate critical pressure and composition (2.5)
(c) Dew point pressure for a mixture of 30% C1 (2.5)
(d) Retrograde composition range if any (2.5)
(e) Equilibrium gas and liquid compositions and fraction of vapor for a mixture of 30% C1 at 600 psia. (5)
PRESSURE-COMPOSITION DIAGRAM AT 220 F FOR A C1/n-C4 MIXTURE
0
200
400
600
800
1000
1200
1400
1600
0 10 20 30 40 50 60 70 80 Methane, %mol
Pressure, psia
8 of 13
- Given the following ternary phase diagram for mixtures of methane, n-butane and n-decane at 180o^ F and 2000 psia, answer the following questions.
(a) Mark on the diagram a mixture of 20% methane, 30% n-butane and 50% n-decane (3)
(b) Estimate the overall composition and the composition of equilibrium liquid and gas if 100 moles of the mixture from part (a) are mixed with 60 moles of pure C1 and brought to equilibrium at 180o^ F and 2000 psia. (7)
Overall (zi) _____________ % C 1 ______________ % n-C 4 ______________ % n-C 10
Gas ______________ % C 1 Liquid _____________ % C 1 ______________ % n-C 4 _____________ % n-C 4 ______________ % n-C 10 _____________ % n-C 10
10 of 13
Mixture C1 / nC4 / nC
@ 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 / nC
@ 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
11 of 13
- Assume the following gas mixture behaves like an ideal gas. Evaluate the mass
and specific gravity of the gas mixture contained in a 1.5 ft^3 tank at 100o^ F and 200 psia. Show intermediate calculations. (15)
Component
Composition (mole fraction) methane (C 1 ) 0. ethane (C 2 ) 0. propane (C 3 ) 0.
Mw (lb/lbmol) =
Density (lb/ft 3 ) =
Mass (lb)=
Specific Gravity =
Useful Information
Species Molecular Weight (lb/lb mol) Gas Constant
Air 29 R = 10.732 psia ft^3 /lbmol o^ R Methane 16. Ethane 30. Propane 44.
