Well Testing – MCQs 50 Score: 0 Attempted: 0/50 Subscribe 1. What is the primary purpose of well testing? (A) Measure drilling performance (B) Evaluate reservoir properties and well performance (C) Estimate casing strength (D) Test pump efficiency 2. Which of the following is NOT a well test type? (A) Drill stem test (DST) (B) Production test (C) Pressure transient test (D) Corrosion coupon test 3. In a Drill Stem Test (DST), the tool is run on: (A) Coiled tubing (B) Wireline (C) Drill pipe (D) Production tubing 4. Which parameter is measured directly in a well test? (A) Reservoir porosity (B) Bottomhole pressure and flow rate (C) Reservoir thickness (D) Oil viscosity 5. The pressure buildup test is performed after: (A) Shutting in the well following a flow period (B) Continuous production for one year (C) Reservoir stimulation (D) Acidizing the formation 6. The Horner plot is commonly used in: (A) DST data analysis (B) Pressure buildup test interpretation (C) Drill pipe testing (D) Coring operations 7. Which equation is widely used in well test analysis? (A) Darcy’s law (B) Bernoulli’s equation (C) Horner’s equation (D) Hagen–Poiseuille law 8. Which of the following is determined from a well test? (A) Reservoir permeability (B) Well productivity index (C) Skin factor (D) All of the above 9. A positive skin factor indicates: (A) Well stimulation effect (B) Formation damage around the wellbore (C) Natural fractures (D) No near-wellbore resistance 10. Which test is used to estimate average reservoir pressure? (A) Drill Stem Test (B) Production logging (C) Pressure buildup test (D) Tracer test 11. Which condition is assumed in most well test analysis? (A) Radial flow (B) Linear flow (C) Spherical flow (D) Non-Darcy flow 12. The slope of a semilog straight line in a Horner plot gives: (A) Porosity (B) Permeability (C) Viscosity (D) Compressibility 13. A negative skin factor means: (A) Formation damage (B) Well stimulation such as acidizing or fracturing (C) Normal reservoir behavior (D) Depletion drive 14. Which test is run for low permeability reservoirs? (A) Short-term DST (B) Interference test (C) Injection test (D) Pulse test 15. A drawdown test involves: (A) Measuring reservoir pressure after well shut-in (B) Producing the well at a constant rate and recording pressure decline (C) Measuring pressure during acidizing (D) Testing casing integrity 16. Interference tests are conducted to measure: (A) Skin factor (B) Wellbore storage (C) Reservoir transmissibility between wells (D) Oil gravity 17. The unit of skin factor is: (A) Darcy (B) Dimensionless (C) psi (D) mD·ft 18. A log-log plot of pressure derivative vs. time is used in: (A) Production logging (B) Modern well test analysis (pressure transient analysis) (C) DST interpretation only (D) Well completion design 19. Wellbore storage effect dominates in: (A) Late-time data (B) Early-time data (C) Middle-time data (D) All-time data 20. What does wellbore storage coefficient represent? (A) Reservoir pore volume (B) Compressibility of well fluids in wellbore (C) Reservoir drive mechanism (D) Fluid viscosity 21. Which drive mechanism causes a rapid pressure drop in well tests? (A) Water drive (B) Gas cap drive (C) Solution gas drive (D) Gravity drainage 22. In pressure derivative plots, a horizontal line indicates: (A) Radial flow (B) Linear flow (C) Spherical flow (D) Wellbore storage 23. The productivity index (PI) is defined as: (A) Rate × Pressure drop (B) Flow rate / Pressure drawdown (C) Permeability / Viscosity (D) Reservoir pressure / Flow rate 24. A buildup test is preferred over drawdown test because: (A) It provides reservoir pressure information (B) Requires less surface equipment (C) Easier to interpret (D) All of the above 25. Which of the following is a limitation of DST? (A) Limited test duration (B) Uncertainty in reservoir size (C) Tool sticking risk (D) All of the above 26. Pressure derivative analysis helps in identifying: (A) Reservoir boundaries (B) Flow regimes (C) Wellbore storage effects (D) All of the above 27. Which of the following tests is suitable for multiwell systems? (A) Pulse test (B) Interference test (C) Drill stem test (D) Injection test 28. Which property of reservoir fluid is essential in well test analysis? (A) Compressibility (B) Viscosity (C) Formation volume factor (D) All of the above 29. What does a slope of “½” on a log-log derivative plot indicate? (A) Radial flow (B) Linear flow (C) Spherical flow (D) Fault boundary 30. In buildup analysis, the straight line extrapolated to Horner time = 1 gives: (A) Skin factor (B) Reservoir pressure (C) Productivity index (D) Wellbore storage 31. Which factor does NOT affect well test results? (A) Reservoir heterogeneity (B) Well completion type (C) Cementing quality (D) Rock and fluid properties 32. Which data is plotted in a Horner plot? (A) Pressure vs. log(Horner time ratio) (B) Flow rate vs. time (C) Pressure vs. depth (D) Rate vs. permeability 33. Which of the following can cause a high positive skin? (A) Partial penetration (B) Mud filtrate invasion (C) Poor perforation (D) All of the above 34. A negative skin factor generally indicates: (A) Well stimulation (B) Damage (C) Boundary effect (D) Water coning 35. The unit of permeability used in well test analysis is: (A) Darcy or millidarcy (B) psi (C) m³/s (D) STB/day 36. The unit of transmissibility (k·h/μ) is: (A) Darcy-cm/s (B) md·ft/cp (C) psi·hr (D) Dimensionless 37. Early-time data affected by wellbore storage is corrected using: (A) Type curve matching (B) Deconvolution (C) Superposition (D) None of the above 38. The late-time deviation from straight line in Horner plot indicates: (A) Infinite reservoir (B) Reservoir boundary (C) Skin effect (D) Wellbore storage 39. Pressure fall-off test is mainly run in: (A) Production wells (B) Injection wells (C) DST wells (D) Abandoned wells 40. Which type of flow regime is observed at intermediate times in fractured reservoirs? (A) Radial flow (B) Bilinear flow (C) Linear flow (D) Spherical flow 41. Well test duration is typically determined by: (A) Depth of the reservoir (B) Distance to boundaries (C) Well completion type (D) Perforation interval 42. Which test is useful for estimating connected reservoir volume? (A) Buildup test (B) Interference test (C) Pulse test (D) Drill stem test 43. Which effect dominates the very early portion of a well test? (A) Reservoir boundary (B) Skin (C) Wellbore storage (D) Radial flow 44. For an infinite-acting reservoir, the late-time Horner plot is: (A) Curved upward (B) A straight line (C) Curved downward (D) Oscillatory 45. A buildup test is most useful when: (A) Well cannot be produced at a constant rate (B) Reservoir has constant pressure support (C) Average reservoir pressure needs to be determined (D) All of the above 46. Which test can be performed while drilling? (A) Buildup test (B) Drill Stem Test (DST) (C) Interference test (D) Pulse test 47. Well testing is important for: (A) Reservoir characterization (B) Reserve estimation (C) Well completion design (D) All of the above 48. Superposition principle in well testing is applied for: (A) Variable rate tests (B) DST (C) Buildup analysis only (D) Single well tests only 49. Which of the following is a limitation of pulse tests? (A) Requires multiple wells (B) Long test duration (C) Difficult to interpret in high-permeability reservoirs (D) All of the above 50. 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