Enhanced Oil Recovery (EOR) – MCQs 50 Score: 0 Attempted: 0/50 Subscribe 1. What is the main objective of Enhanced Oil Recovery (EOR)? (A) Reduce drilling costs (B) Increase ultimate oil recovery from a reservoir (C) Lower refining expenses (D) Reduce well logging time 2. Which of the following is NOT an EOR method? (A) Thermal recovery (B) Gas injection (C) Chemical flooding (D) Hydraulic fracturing 3. Thermal EOR techniques are most effective for: (A) Light oil reservoirs (B) Heavy oil reservoirs (C) Gas condensate reservoirs (D) Carbonate reservoirs 4. The main purpose of steam injection in thermal EOR is to: (A) Increase viscosity of oil (B) Reduce viscosity of oil (C) Freeze water cut (D) Enhance permeability 5. In-situ combustion is also known as: (A) Fire flooding (B) Steam flooding (C) Air drilling (D) CO₂ injection 6. Which gas is most commonly used in miscible gas injection EOR? (A) Nitrogen (B) Oxygen (C) Carbon dioxide (D) Hydrogen 7. CO₂ flooding works best when: (A) Reservoir pressure is low (B) Reservoir temperature is very high (C) Oil is light to medium gravity (D) Oil viscosity is extremely high 8. Polymer flooding enhances recovery by: (A) Increasing water viscosity to improve sweep efficiency (B) Reducing permeability of rock (C) Reducing oil viscosity directly (D) Dissolving in crude oil 9. Surfactant flooding improves recovery by: (A) Increasing oil density (B) Reducing interfacial tension between oil and water (C) Raising oil viscosity (D) Increasing reservoir pressure 10. Which of the following is a disadvantage of thermal EOR? (A) Requires high water usage (B) Limited to light oil reservoirs (C) Reduces sweep efficiency (D) Cannot increase oil mobility 11. In miscible flooding, the injected fluid and reservoir oil: (A) Stay separate phases (B) Form a single homogeneous phase (C) React chemically (D) Become immiscible 12. The main advantage of CO₂ flooding is: (A) It increases oil viscosity (B) It decreases miscibility (C) It improves displacement efficiency (D) It reduces sweep efficiency 13. Which EOR method is most effective in carbonate reservoirs? (A) Steam injection (B) Polymer flooding (C) Surfactant flooding (D) CO₂ injection 14. SAGD in thermal EOR stands for: (A) Steam-Assisted Gas Drive (B) Steam-Assisted Gravity Drainage (C) Solvent-Aided Gas Drive (D) Secondary Air Gas Drainage 15. In chemical EOR, alkali flooding works by: (A) Creating emulsions to block high-permeability zones (B) Reacting with organic acids to form natural surfactants (C) Increasing water viscosity (D) Reducing oil viscosity directly 16. Which factor limits CO₂ flooding projects? (A) High oil API gravity (B) Availability and transportation of CO₂ (C) High water cut (D) Oil temperature 17. The effectiveness of miscible gas injection depends on: (A) Minimum Miscibility Pressure (MMP) (B) API gravity only (C) Water salinity (D) Porosity alone 18. A hybrid EOR method combining chemical and thermal techniques is called: (A) Polymer-surfactant flooding (B) Alkaline-surfactant-polymer (ASP) flooding (C) Gas lift (D) Foam injection 19. Which type of oil is the most difficult to recover using EOR? (A) Light oil (B) Medium oil (C) Heavy oil (D) Extra-heavy oil 20. The purpose of foam in EOR is to: (A) Block high-permeability streaks (B) Reduce oil viscosity (C) Lower reservoir pressure (D) Increase gas solubility 21. The first large-scale EOR project using CO₂ was in: (A) Saudi Arabia (B) USA (Permian Basin) (C) Russia (D) Canada 22. In thermal EOR, cyclic steam stimulation is also called: (A) Huff and puff (B) Push and pull (C) Flooding (D) Steam drive 23. Gas injection EOR improves recovery mainly by: (A) Reducing oil saturation pressure (B) Displacing oil and improving miscibility (C) Reducing rock permeability (D) Reducing capillary pressure alone 24. Which of the following is a limitation of surfactant flooding? (A) High cost and adsorption losses (B) Limited application in light oils (C) High miscibility with oil (D) Low effectiveness at low salinity 25. SAGD requires: (A) Vertical wells only (B) A pair of horizontal wells (C) High-pressure gas injection (D) Foam injection 26. Miscible gas injection efficiency decreases when: (A) Reservoir pressure is below MMP (B) Reservoir temperature is moderate (C) Oil is light (D) Permeability is high 27. Which of the following increases with polymer flooding? (A) Mobility ratio improvement (B) Capillary pressure (C) Oil compressibility (D) Rock wettability 28. Solvent injection in EOR is used to: (A) Increase oil viscosity (B) Reduce oil viscosity and improve miscibility (C) Reduce permeability (D) Alter rock porosity 29. In-situ combustion requires injection of: (A) Nitrogen (B) Air or oxygen (C) Steam (D) CO₂ 30. Which property of oil is most critical for selecting thermal EOR? (A) Density (B) Viscosity (C) API gravity (D) Compressibility 31. CO₂ miscibility in EOR improves with: (A) Increasing temperature (B) Increasing pressure (C) Reducing pressure (D) Increasing water saturation 32. Which factor can negatively impact chemical EOR success? (A) High salinity and hardness of reservoir water (B) High oil saturation (C) High permeability (D) High temperature 33. Steam flooding requires: (A) Low reservoir temperature (B) Large volumes of water and fuel (C) Gas miscibility (D) Foam injection 34. One of the environmental concerns of EOR projects is: (A) Air emissions and water use (B) Reduction of oil viscosity (C) Increased well productivity (D) High porosity 35. Which combination is widely used for offshore EOR? (A) Steam flooding (B) Polymer flooding (C) Gas injection (CO₂/N₂) (D) In-situ combustion 36. In ASP flooding, polymer is used to: (A) Reduce oil viscosity (B) Control mobility and improve sweep (C) Reduce interfacial tension (D) Increase reservoir pressure 37. Which of the following is a thermal EOR disadvantage in offshore fields? (A) High cost and space limitations (B) High miscibility pressure (C) Low oil recovery (D) Unstable foam generation 38. Which of the following is an advantage of nitrogen injection in EOR? (A) Readily available and inexpensive (B) High miscibility with oil (C) Strong solvent power (D) High density 39. Which EOR method is most suitable for tar sands? (A) SAGD (B) CO₂ injection (C) Polymer flooding (D) Gas lift 40. The effectiveness of surfactant flooding depends on: (A) Oil viscosity alone (B) Wettability alteration and interfacial tension reduction (C) Reservoir depth only (D) Capillary pressure alone 41. Which EOR method involves injecting alternating slugs of water and gas? (A) SAGD (B) WAG (Water-Alternating-Gas) injection (C) ASP flooding (D) Polymer flooding 42. Thermal EOR is least effective in: (A) Shallow reservoirs (B) Thin reservoirs (C) Heavy oil reservoirs (D) Tar sands 43. Minimum miscibility pressure is defined as: (A) The lowest pressure at which miscibility occurs between injected gas and oil (B) The reservoir pressure at abandonment (C) The bubble point of crude oil (D) The steam injection pressure 44. Which of the following is a challenge in polymer flooding? (A) Polymer degradation at high temperature and salinity (B) Low injection cost (C) High miscibility (D) Limited sweep efficiency 45. In cyclic steam stimulation, the cycle includes: (A) Steam injection, soaking, and production (B) Gas injection, miscibility, and recovery (C) Air injection, combustion, and displacement (D) Polymer injection, mobility control, and recovery 46. Miscible EOR improves recovery efficiency by: (A) Eliminating capillary forces (B) Increasing reservoir pressure only (C) Reducing permeability (D) Reducing viscosity alone 47. The success of SAGD depends on: (A) Creating a steam chamber between horizontal wells (B) Injecting surfactant with steam (C) Reducing reservoir porosity (D) Using cyclic gas injection 48. Which EOR method provides carbon sequestration benefits? (A) CO₂ injection (B) SAGD (C) ASP flooding (D) Nitrogen injection 49. One limitation of in-situ combustion is: (A) Difficult to control combustion front (B) Requires light oil reservoirs (C) Reduces displacement efficiency (D) High miscibility pressure 50. The overall recovery factor in EOR projects typically increases by: (A) 1–2% (B) 5–15% (C) 20–30% (D) 50–70% FOUNDATIONAL SUBJECTS (Year 1 – Year 2)Engineering Mechanics (Statics & Dynamics) – MCQsFluid Mechanics – MCQsThermodynamics – MCQsComputer Programming (e.g., MATLAB, Python) – MCQsIntroduction to Engineering – MCQsGeology for Engineers – MCQsTechnical Communication – MCQs CORE PETROLEUM ENGINEERING SUBJECTS (Year 2 – Year 4)Introduction to Petroleum Engineering – MCQsPetroleum Geology – MCQsDrilling Engineering – MCQsReservoir Engineering – MCQsProduction Engineering – MCQsPetroleum Fluid Properties – MCQsWell Logging and Formation Evaluation – MCQsPetroleum Economics – MCQsPetroleum Refining and Processing – MCQs Natural Gas Engineering – MCQsEnhanced Oil Recovery (EOR) – MCQsWell Testing – MCQsReservoir Simulation – MCQsDrilling Fluids and Cementing – MCQsOffshore Petroleum Engineering – MCQsHealth, Safety and Environment (HSE) – MCQsPetroleum Project Management – MCQsCorrosion Engineering – MCQsArtificial Lift Techniques – MCQsPetrophysics – MCQs LABORATORIES & PRACTICALS (Theory-based MCQs can be made from these)Drilling Fluids Lab – MCQsCore Analysis Lab – MCQsReservoir Simulation Lab – MCQsRock and Fluid Properties Lab – MCQsWell Logging Lab – MCQs ELECTIVES (Optional/Advanced)Energy Transition and Sustainability – MCQsUnconventional Resources (Shale, Tight Gas, etc.) – MCQsData Analytics in Petroleum Engineering – MCQsGeographic Information Systems (GIS) – MCQsPetroleum Law and Policy – MCQsPipeline Engineering – MCQsRenewable Energy Integration – MCQs