PETROLEUM ENGINEERING 310 FIRST EXAM. September 19, 2001

Transcription

1 PETROLEUM ENGINEERING 31 FIRST EXAM September 19, 1 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 12 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: PETE 31 Exam 1 1/1

2 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) H 3 C CH 2 C CH 2 C CH 3 C H 3 CH CH 2 CH3 H 3 C H 2 C C H 2 CH 2 CH 2 CH HC CH 3 HC CH 2 CH CH CH 3 HC C CH 2 CH H 3 C PETE 31 Exam 1 2/1

3 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) PETE 31 Exam 1 3/1

4 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= psia? (2 pts) b. What is the saturation pressure of A, B and C at T = 15 F? (3 pts) c. What is the saturation temperature of A, B, and C at p= psia? (3 pts) d. Which one is the heaviest component and why. (2 pts) Mark all the points in the graph 28 A B 22 Pressure (psia) C Temperature ( o F) PETE 31 Exam 1 4/1

5 5 9. A 3 ft 3 cylinder is evacuated and filled with thirty pounds (3 lbm) of propane at 65 o F. If the densities of the liquid and the vapor are lb m /ft 3 and 1.7 lb m /ft 3. Evaluate. (a) Volumetric fraction of liquid propane In the container (6 pts) (b) Mass fraction of liquid propane. (5 pts) PETE 31 Exam 1 5/1

6 6 12. Given the following Information sketch a pressure-volume diagram for ethane showing clearly the two-phase region, the critical isotherm, the -7. o F isotherm, and a supercritical isotherm. Label all points and pertinent regions completely. (1 pts) Data: V c =.783 ft 3 /lbm Gas Saturation Volume at -7. o F V g =.65 ft 3 /lbm Pressure Temperature Diagram for Ethane Pressure -Volume Diagram for Ethane 8 8 Vapor Phase Liquid Phase Pressure(psia) 5 4 Pressure(psia) Temperature( o F) V (ft3/lbm) PETE 31 Exam 1 6/1

7 7 13. Using the information presented in the following diagram sketch a pressure composition diagram for T= 8 o F and T= o F. (1 pts) Label completely. Pressure (psia) A B Temperature o F Pressure (psia) Composition of % PETE 31 Exam 1 7/1

8 8 14. Consider the temperature composition diagram (below) of C 3 /n-c 6 systems at p= psia. Temperature Composition Diagram for C 3 /n-c 6 at P= psia 4 35 Temperature, o F Propane, Mole % Finish labeling this graph and complete the following table using information given In the diagram. (4 pts) System Td Pd Tb Pb.4 C 3 /.6n-C 6. C 3 /1. n-c 6 A liquid mixture of 6% mole of C 3 is heated at constant pressure to T= o F. Indicate the compositions of the gas and liquid formed and the molar percentage that vaporized (6 pts) T = o F z 3 y 3 x 3 f v (n v /n t ) p = psia.5 PETE 31 Exam 1 8/1

9 9 15. Given the following ternary phase diagram for mixtures of methane, n-butane and n-decane at 18 o F and psia, answer the following questions. a. Locate on the diagram a mixture of 2% methane, 1% n-butane and 7% n-decane. (2 pts) b. Estimate the composition of equilibrium liquid and gas if moles of the mixture from part (a) are mixed with moles of a mixture with 8% C 1 and 2 % n-c 4 and brought to equilibrium at 18 o F and psia. (6 pts) Mixture C1 / nc4 / p= psia, T=18 F Mixture % C 1 % n-c 4 % n-c 1 Gas % C 1 % n-c 4 % n-c 1 Liquid % C 1 % n-c 4 % n-c 1 PETE 31 Exam 1 9/1

10 1 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 ft 3 container at o F and psia. (R=1.72 psia ft 3 / o R-lb-mole) Composition Component (mole fraction) methane (C 1 ).8 ethane (C 2 ).1 propane (C 3 ).1 PETE 31 Exam 1 1/1