Petroleum Fluid Properties – MCQs

50 Score: 0 Attempted: 0/50

1. Petroleum fluids are generally categorized into:
(A) Oil, gas, and water
(B) Coal, shale, and tar sands
(C) Paraffin, naphthene, and aromatics
(D) Drilling mud and cement

2. Black oil reservoirs are characterized by:
(A) High gas-to-oil ratio
(B) Low gas-to-oil ratio
(C) Condensate formation
(D) No liquid hydrocarbon

3. Gas condensate reservoirs produce:
(A) Only dry gas
(B) Oil at the surface only
(C) Gas with liquid condensate at surface conditions
(D) Water only

4. Volatile oil differs from black oil because it:
(A) Produces large amounts of gas at surface conditions
(B) Has a very low gas-to-oil ratio
(C) Produces only dry gas
(D) Contains no hydrocarbons

5. The gas-to-oil ratio (GOR) is defined as:
(A) Reservoir oil ÷ reservoir pressure
(B) Produced gas volume ÷ produced oil volume at standard conditions
(C) Oil density ÷ water density
(D) Permeability ÷ porosity

6. Formation volume factor (Bo) of oil is:
(A) Ratio of reservoir oil volume to surface oil volume
(B) Ratio of surface oil to reservoir oil
(C) Always equal to 1
(D) Oil viscosity ÷ gas viscosity

7. The formation volume factor for gas (Bg) is usually:
(A) Less than 1
(B) Greater than 1
(C) Equal to porosity
(D) Independent of pressure

8. Oil density typically decreases with:
(A) Increasing pressure
(B) Increasing temperature
(C) Increasing porosity
(D) Decreasing permeability

9. Gas density typically increases with:
(A) Increasing pressure
(B) Increasing temperature
(C) Increasing porosity
(D) Increasing GOR

10. API gravity is a measure of:
(A) Gas viscosity
(B) Oil density relative to water
(C) Oil compressibility
(D) Water salinity

11. An oil with API gravity greater than 31.1° is classified as:
(A) Heavy oil
(B) Medium oil
(C) Light oil
(D) Extra heavy oil

12. Viscosity of crude oil generally:
(A) Increases with increasing temperature
(B) Decreases with increasing temperature
(C) Independent of temperature
(D) Equal to water viscosity

13. Gas viscosity usually:
(A) Increases slightly with pressure
(B) Decreases sharply with pressure
(C) Is constant at all conditions
(D) Is higher than oil viscosity

14. Bubble point pressure is:
(A) Pressure at which first bubble of gas appears in oil
(B) Pressure at which last gas dissolves in oil
(C) Reservoir abandonment pressure
(D) Pressure equal to hydrostatic head

15. Dew point pressure is:
(A) Pressure at which first liquid drop forms from gas
(B) Pressure at which last liquid vaporizes
(C) Equal to bubble point
(D) Abandonment pressure

16. The critical point of petroleum fluids is defined as:
(A) Point where liquid and gas phases become indistinguishable
(B) Point of maximum viscosity
(C) Minimum reservoir pressure
(D) Bubble point only

17. PVT analysis stands for:
(A) Pressure–Volume–Temperature analysis
(B) Porosity–Velocity–Transport
(C) Production–Viscosity–Testing
(D) Pump–Valve–Tubing analysis

18. Solution gas–oil ratio (Rs) is:
(A) Volume of gas dissolved in oil at reservoir conditions
(B) Produced gas volume ÷ produced oil volume
(C) Oil density ÷ water density
(D) Porosity ÷ permeability

19. Gas compressibility factor (Z-factor) accounts for:
(A) Non-ideal behavior of real gases
(B) Oil density changes
(C) Water salinity
(D) Tubing diameter

20. At low pressures, Z-factor approaches:
(A) 0
(B) 1
(C) Infinity
(D) Gas viscosity

21. Oil compressibility is usually expressed in:
(A) psi⁻¹
(B) cp
(C) scf/bbl
(D) mD

22. Gas formation volume factor (Bg) relates:
(A) Reservoir gas volume to surface gas volume
(B) Surface gas to reservoir gas
(C) Oil density to water density
(D) Viscosity to permeability

23. A higher Rs (solution GOR) means:
(A) More gas dissolved in oil
(B) Less gas dissolved in oil
(C) Higher water cut
(D) Lower porosity

24. Crude oil with high paraffin content tends to:
(A) Deposit wax at low temperatures
(B) Have very high API gravity
(C) Have no viscosity issues
(D) Always form condensate

25. Asphaltenes in crude oil can cause:
(A) Flow assurance problems
(B) Increased viscosity
(C) Deposition in pipelines
(D) All of the above

26. The flash point of crude oil is:
(A) The lowest temperature at which it gives off vapors that ignite
(B) The highest safe temperature for refining
(C) The bubble point
(D) The dew point

27. Crude oil viscosity is strongly influenced by:
(A) Asphaltene content
(B) Temperature
(C) Pressure
(D) All of the above

28. Wet gas is defined as:
(A) Gas that produces liquid hydrocarbons at surface conditions
(B) Pure methane gas
(C) Gas containing water only
(D) Non-combustible gas

29. Dry gas contains primarily:
(A) Methane
(B) Ethane and propane
(C) Butane
(D) Heavy hydrocarbons

30. Gas gravity is defined relative to:
(A) Air
(B) Water
(C) Oil
(D) CO₂

31. The molecular weight of methane is approximately:
(A) 10
(B) 16
(C) 20
(D) 30

32. The Joule–Thomson coefficient describes:
(A) Temperature change of gas due to pressure drop
(B) Gas viscosity variation
(C) Oil compressibility
(D) API gravity

33. Retrograde condensation occurs in:
(A) Gas condensate reservoirs
(B) Dry gas reservoirs
(C) Black oil reservoirs
(D) Heavy oil reservoirs

34. Water cut in production refers to:
(A) Fraction of water in produced fluids
(B) Water salinity
(C) Produced water volume ÷ gas volume
(D) Oil API gravity

35. Relative permeability is a function of:
(A) Fluid saturation
(B) Porosity only
(C) Temperature only
(D) Rock compressibility

36. Interfacial tension (IFT) between oil and water affects:
(A) Capillary pressure and flow behavior
(B) API gravity
(C) Gas compressibility
(D) Tubing wear

37. Oil–water contact (OWC) in a reservoir is determined by:
(A) Capillary pressure
(B) Seismic surveys
(C) Bubble point pressure
(D) Rock compressibility

38. Gas hydrates form under:
(A) Low temperature and high pressure
(B) High temperature and low pressure
(C) Low salinity
(D) Very high porosity

39. The saturation pressure of crude oil is also called:
(A) Bubble point pressure
(B) Critical pressure
(C) Abandonment pressure
(D) Dew point

40. Produced crude oil with high sulfur content is called:
(A) Sweet crude
(B) Sour crude
(C) Paraffinic crude
(D) Asphaltic crude

41. Sweet crude oil contains:
(A) Low sulfur content
(B) High sulfur content
(C) No hydrocarbons
(D) Only methane

42. The density of petroleum fluids is usually measured using:
(A) Hydrometer
(B) Permeameter
(C) Core plug
(D) Viscometer

43. The viscosity of fluids is commonly measured in:
(A) centipoise (cp)
(B) millidarcies (mD)
(C) scf/bbl
(D) API units

44. Reservoir temperature has a major effect on:
(A) Oil viscosity and gas solubility
(B) Porosity only
(C) Permeability only
(D) Water cut only

45. Crude oil with API gravity less than 10° is:
(A) Heavier than water
(B) Lighter than water
(C) Same density as water
(D) Always sweet crude

46. Natural gas liquids (NGLs) include:
(A) Ethane, propane, butane, and pentane
(B) Only methane
(C) Heavy oil
(D) CO₂ and H₂S

47. Water salinity in petroleum fluids is expressed in:
(A) ppm or mg/L
(B) scf/bbl
(C) cp
(D) API gravity

48. Capillary number relates viscous to:
(A) Capillary forces
(B) Gas solubility
(C) Reservoir pressure
(D) Water cut

49. Flash gas is:
(A) Gas released when oil is brought to surface pressure and temperature
(B) Gas injected into a reservoir
(C) Dry gas from methane
(D) Gas reinjected for pressure maintenance

50. The main purpose of fluid property evaluation in petroleum engineering is to:
(A) Model reservoir performance and design production systems
(B) Build drilling rigs
(C) Manufacture pumps
(D) Refine crude oil

Petroleum Fluid Properties – MCQs

FOUNDATIONAL SUBJECTS (Year 1 – Year 2)

CORE PETROLEUM ENGINEERING SUBJECTS (Year 2 – Year 4)

LABORATORIES & PRACTICALS (Theory-based MCQs can be made from these)

ELECTIVES (Optional/Advanced)