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B.Tech (Second Year)
PE 04024 NATURAL GAS ENGINEERING
PE 04026 PRODUCTION OPERATIONS OF PROBLEM WELLS
PE 04025 RESERVOIR ENGINEERING I
PE 04042 DRILLING ENGINEERING II
PE 04036 TRANSPORTATION OF OIL AND GAS
MINISTRY OF SCIENCE AND TECHNOLOGY
DEPARTMENT OF TECHNICAL AND VOCATIONAL EDUCATION
Sample Questions & Worked Out Examples For
PE-04024
NATURAL GAS ENGINEERING
B.Tech(Second Year)
Petroleum Engineering
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Ministry of Science and Technology Department of Technical and Vocational Education
Petroleum Engineering
Natural Gas Engineering
P.E (04024 ) Twenty Five Questions
Part( I )
Chapter( I )
3. What is the natural gas? ( M-10 Marks ) 4. Explain the origin of natural gas. (S-10 Marks ) 5. Describe the occurrences of natural gas in conventional reservoirs.
( C-16 Marks) 6. Describes other sources of gaseous fuel. (M-16 Marks ) 7. Explain natural gas production and processing system. (S-10 Marks )
Chapter( II )
3. Explain early gas law. (C-10 Marks ) 4. Calculate the mass of methane gas contained at 1000 psia and 68 H F in a cylinder with
volume of 3.20 cuft. Assume that methane is an ideal gas. (M-5 Marks )
5. Dry air is a gas mixture consisting essentially of nitrogen, oxygen, and small amount of other gases. Compute the apparent molecular weight of air given its approximate composition .The molecular weight of each component may be found in table .
Component Mole fraction (yi ) Nitrogen 0.78 Oxygen 0.21 Argon 0.01 (S-10 Marks)
6. Calculate the gravity of a natural gas of the following composition.
Component Mole fraction Methane 0.85 Ethane 0.09 Propane 0.04 n-Butane 0.02 1.00 (C-5 Marks)
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7. Calculate the pseudo-critical temperature and pseudo-critical pressure of the following
natural gas mixture .Use the critical constants given in table .
Component Mole fraction Critical Temperature Critical pressure (psi)
C1 85% 343.1 667.8 C2 9% 549.8 707.8 C3 4% 665.7 616.3 C4 2% 765.3 550.7 (M-16 Marks )
8. A gas has the following composition measured at 2500 psia and 300’f . calculate the composition in mole fraction .The volume percents at these conditions are
Component Volume percent Tr Pr
C1 67% 2.22 3.72 C2 30% 1.40 3.53 C3 1% 1.14 4.06 C4 2% 1.30 2.32 (S-16 Marks) 9. A gas containing 2.87% CO2 and 23.27% .H2s has a critical pressure 322 psia and a
critical temperature of 465’R .Find the gas compressibility factor z , for P =1000 psia , t = 100’F . (C-16 Marks)
8. Using both the Curr and Lee methods , calculate the viscosity of 0.8 gravity gas at a
pressure 2000 psia and a temperature of 150 ‘F . The gas contains 10% H2S and 10% CO2. (M-16 Marks)
Chapter (III)
1. Describe the relation of flow regime and Reynolds number. (S-5 Marks)
2. What is the maximum pressure at which a 10 in nominal size pipe ( O.D =10.75 , I.D =10.02 in ) can be operated? Calculate the maximum throughput for a 40 mile pipeline of this type, using Weymouth equation. Assume ε/d = 0.002, c= 0.05, E = 1.0 Y = 0.40, S = 35,000 psia, Tav =100’F, µg = 0.01cp, Xg = 0.70 .Assume 0.0 psia minimum pressure. (C-16 Marks)
Chapter (IV)
1. Describe the different types of compressors. (M-5 Marks)
3. Explain the Reciprocating positive –displacement compressors.
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( S-10 Marks) 4. Explain the rotary positive –Displacement compressors. (C-10 Marks)
5. Describe the Sliding-Vane compressors. (M-10 Marks) 6. Describe two-Impeller Straight-lobe compressors. (S-5 Marks)
7. Describe liquid-piston compressors and helical-lobe compressors.
(C-5 Marks)
8. Explain Arial-flow Compressors and Mixed-flow compressors. (M-10 Marks)
9. Explain dynamic compressors and centrifugal compressors. (S-12 Marks)
10. What are Ejectors? (C-10 Marks) 11. Discuss the compressor selection. (M-20 Marks)
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Ministry of Science and Technology Department of Technical and Vocational Education
Petroleum Engineering
Natural Gas Engineering
P.E ( 04024 ) Twenty Five Questions
Part ( II) Chapter (I)
1. Draw the possible pressure losses in complete system. (S-16 Marks) [Page-2, Volume (II)] 2. Draw the location of various nodes in complete systems. (C-10 Marks) [Page-3, Volume (II)]
3. A stabilized deliverability test was conducted on a gas well to obtain reservoir inflow performance data. Determine the flow capacity of the well for both 1.995 in and 2.441 ID tubing if Ptf is constant at 1000 psia. Other data are: n=0.83 c = 0.0295 Mscfd / psia2 Pr =1952 psia H = 10,000ft (M-16 Marks)
4. A 10,000 ft vertical well is equipped with 1.995 ID tubing and a 6000 ft flowline. Separator pressure is fixed at 1000 psia.Using the following data , determine the flow capacity for the system for both a 1.995 ID flowline and 2.441 ID flowline.
γg=0.67 , Tr=220’F Tn = 100’F Tsep =60’F µg=0.012cp ε = 0.0018 in n = 0.83, z = 0.95 c = 0.0295 Mscfd/ psia1.86 Pr = 1952 psia (S-16 Marks)
5. Determine the flow capacity for the well system for the 1.995 flow line at separator pressure of 1200, 1000, 800 and 500 psia.
Given data: A 10,000 ft vertical well is equipped with 1.995 ID tubing and a 6,000 ft flow line.
Separator pressure is fixed at 1000 psia . γg= 0.67, Tr = 220’F Tn = 100’F Tsep = 60’F,
µg = 0.012 cp ε = 0.0018 in n = 0.83 , z = 0.95 c = 0.0295 Mscfd / psia1.86 Pr = 1952 psia (C-16 Marks)
8. Discuss the compressor selection. (M-10 Marks)
Chapter ( II ) 1. What is accuracy? (S-5 Marks) 2. What is Rangeability? (C-5 Marks) 3. What is Repeatibility? (M-5 Marks)
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4. What is Linearlity? (S-5 Marks) 5. Explain the fundamentals of measurement. (C-16 Marks) [Page- (14, 15 ), Volume (II)] 6. Explain the how to consider the selection of measurement devices.
(M-5 Marks) 7. Describe the orifice meter. (S-5 Marks) 8. Describe the venturi meter. (C-5 Marks) 9. Describe the critical flow provers. (M-5 Marks)
10. Explain the displacement meters. (S-10 Marks) 11. Explain the turbine meter. (C-10 Marks) 12. Explain the Ratometer. (M-10 Marks) 13. Explain the ultrasonic meter. (S-10 Marks)
Chapter ( III ) 1. How to control hydrate? (C-10 Marks) 2. Explain the corrosion. (M-10 Marks) [Page- ( 37, 38 ) ,Volume (II) ] 3. Explain the sulphur deposition. (S-10 Marks) Chapter ( IV ) 1. How to consider in sizing and selecting a separator? (8 marks) 2. Explain types of separators. (C-16 Marks) [Page- ( 47, 48, 49, 50 ),Volume (II)] 3. Explain the stage separation. (M-16 Marks)
(M)= It must be studied. (S)= It should be studied. (C)= It could be studied.
Ministry of Science and Technology Department of Technical and Vocational Education
Petroleum Engineering
Natural Gas Engineering
P.E ( 04024 ) Ten Sample Questions & Answers
1. Describe the occurrences of natural gas in conventional reservoirs. ( 16 Marks) Page ( 6, 7, 8 ) Vol. I Solutions
2. Describes other sources of gaseous fuel. ( 16 Marks )
Page ( 8, 9,10 ) Vol. I Solutions
3. Calculate the pseudo-critical temperature and pseudo-critical pressure of
the following natural gas mixture .Use the critical constants given in table . Component Mole fraction Critical Temperature Critical pressure (psi)
C1 85% 343.1 667.8 C2 9% 549.8 707.8 C3 4% 665.7 616.3 C4 2% 765.3 550.7 (16 Marks ) Page ( 30 ) Vol. I
4. A gas has the following composition measured at 2500 psia and 300’f . calculate
the composition in mole fraction .The volume percents at these conditions are
Component Volume percent Tr Pr
C1 67% 2.22 3.72 C2 30% 1.40 3.53 C3 1% 1.14 4.06 C4 2% 1.30 2.32 (16 Marks)
Page ( 31 ) Vol. I
5. What is the maximum pressure at which a 10 in nominal size pipe ( O.D = 10.75 ,
I.D =10.02 in ) can be operated? Calculate the maximum throughput for a 40 mile pipeline of this type, using Weymouth equation. Assume ε/d = 0.002, c= 0.05, E = 1.0 Y = 0.40 , S = 35,000 psia, Tav =100’F , µg = 0.01cp Xg = 0.70 .Assume 0.0 psia minimum pressure. (16 Marks) Page ( 49 ) Vol. I
Solutions
6. Draw the possible pressure losses in complete system. (16 Marks) [Page-2, Volume (II)] Solutions
7. Draw the location of various nodes in complete systems. (10 Marks) [Page-3, Volume (II)] Solutions
8. Explain the fundamentals of measurement. (16 Marks)
[Page- ( 14, 15 ), Volume (II)] Solutions
9. Explain the corrosion. (10 Marks) [Page- ( 37, 38 ) , Volume (II)] Solutions
10. Explain types of separators. (16 Marks)
[Page- ( 47, 48, 49, 50 ), Volume (II)] Solutions
