Reservoir Development and Production Quiz PDF

Reservoir Development and Production Quiz Answers 1. Which of the following is NOT a drive mechanism for the Ekofisk reservoir? A. Water Drive B. Compaction Drive C. Solution Gas Drive D. Pressure depletion Answer: Water Drive (A) The Ekofisk reservoir has four drive mechanisms: Pressure depletion,...

Reservoir Development and Production Quiz Answers 1. Which of the following is NOT a drive mechanism for the Ekofisk reservoir? A. Water Drive B. Compaction Drive C. Solution Gas Drive D. Pressure depletion Answer: Water Drive (A) The Ekofisk reservoir has four drive mechanisms: Pressure depletion, Solution Gas Drive, Water Drive, and Compaction Drive. 2. What was the original recoverable reserves of the Ekofisk reservoir? A. 3.3 billion bbls oil B. 5.6 TCF gas C. 3.3 billion bbls oil and 5.6 TCF gas D. None of the above Answer: 3.3 billion bbls oil (A) The original recoverable reserves of the Ekofisk reservoir were 3.3 billion bbls oil. 3. What was the development decision for the Ekofisk reservoir made? A. 1973 B. 1974 C. 1972 D. 1971 Answer: 1972 (C) The development decision for the Ekofisk reservoir was made in 1972. 4. Which year did Ekofisk production license get extended to? A. 2022 B. 1989 C. 1972 D. 2017 Answer: 2022 (A) In April 2022, Ekofisk production license was extended to 2048. 5. What is the approximate value of 6 million m3 of oil in euros at $50/bbl? A. 2 billion B. 4 billion C. 6 billion D. 1 billion Answer: 2 billion (A) 6 million m3 of oil is approximately valued at 2 billion euros at $50/bbl. 6. Which seismic technique was used to identify a fault/fracture causing unwanted flow connection between water injector I1 and producer P1? A. 4D seismic B. Time-lapse seismic C. 3D seismic D. 2D seismic Answer: 4D seismic (A) The 4D seismic technique was used to identify the fault/fracture causing the unwanted flow connection. 7. Which drive mechanism contributed the least to the primary recovery of the Ekofisk reservoir? A. Solution gas drive B. Compaction drive C. Water drive D. Pressure depletion Answer: Water drive (C) The primary recovery of the Ekofisk reservoir was mainly driven by pressure depletion and solution gas drive, with a smaller contribution from compaction drive. Water drive was not a significant factor in the primary recovery. 8. What was the initial pressure of the Ekofisk reservoir? A. 7135 psi B. 1980 psi C. 5443 psi D. 30-40 cm/year Answer: 7135 psi (A) The initial pressure of the Ekofisk reservoir was 7135 psi. 9. What was the estimated final primary recovery factor of the Ekofisk reservoir? A. 24% B. 20% C. 10% D. 15% Answer: 24% (A) The estimated final primary recovery factor of the Ekofisk reservoir was approximately 24%. 10. What was the primary recovery mechanism of the Ekofisk reservoir? A. Pressure depletion B. Compaction drive C. Water drive D. Solution gas drive Answer: Pressure depletion (A) The primary recovery of the Ekofisk reservoir was driven by pressure depletion. 11. Which year did the Ekofisk field receive a production license extension? A. 1972 B. 1989 C. 2022 D. 2017 Answer: 2022 (C) In April 2022, the Ekofisk production license was extended to 2048. 12. What was the primary recovery mechanism of the Ekofisk reservoir? A. Water floodings B. Naturally fractured chalk C. Pressure depletion D. Compaction drive contribution Answer: Pressure depletion (C) The primary recovery mechanism of the Ekofisk reservoir was pressure depletion. 13. What is the approximate value of 6 million m3 of oil in euros at $50/bbl? A. $10 billion B. $1 billion C. $20 billion D. $2 billion Answer: $2 billion (D) At $50 per barrel, 6 million m3 of oil is approximately worth 2 billion euros. 14. Which phase of production in the Ekofisk reservoir is characterized by pressure depletion? A. Compaction drive contribution B. Secondary production phase C. Water floodings D. Primary production phase Answer: Primary production phase (D) The primary production phase in the Ekofisk reservoir is characterized by pressure depletion. 15. What is the typical viscosity of Ekofisk oil? A. 10 cp B. 5 cp C. 0.25 cp D. 1.5 cp Answer: 0.25 cp (C) The typical viscosity of Ekofisk oil is 0.25 cp. 16. What was the recovery factor targeted in the development plan for the Ekofisk reservoir? A. 40% B. 20% C. 50% D. 30% Answer: 20% (B) The targeted recovery factor in the development plan for the Ekofisk reservoir was 20%. 17. Which drive mechanism contributed the most to the primary recovery of the Ekofisk reservoir? A. Pressure depletion B. Compaction drive C. Solution gas drive D. Water drive Answer: Pressure depletion (A) The primary recovery of the Ekofisk reservoir was mainly driven by pressure depletion. 18. What was the approximate increase in expected recovery from the water injector at Ekofisk? A. 15% B. 5% C. 10% D. 20% Answer: 10% (C) The expected increase in recovery from the water injector at Ekofisk was approximately 10%. 19. Which technique was used to monitor the Ekofisk reservoir over time? A. Pressure depletion B. 4D seismic C. Water flooding D. Compaction drive Answer: 4D seismic (B) The Ekofisk reservoir was monitored over time using 4D seismic surveys and a permanent reservoir monitoring system. 20. What was the approximate decrease in porosity of the Ekofisk Chalk due to compaction? A. 15% B. 10% C. 20% D. 5% Answer: 20% (C) The porosity of the Ekofisk Chalk decreased by approximately 20% due to compaction. 21. Which platform was added to the Ekofisk field in 1989? A. Ekofisk K B. Ekofisk J C. Ekofisk X D. Ekofisk W Answer: Ekofisk W (D) In 1989, Ekofisk W (water injection) platform was added to the Ekofisk field. 22. What was the approximate value of 6 million m3 of oil in euros at $50/bbl? A. 1 billion euro B. 3 billion euro C. 4 billion euro D. 2 billion euro Answer: 2 billion euro (D) 6 million m3 of oil at $50/bbl is approximately equal to 2 billion euro. 23. Which year did the Ekofisk field receive a production license extension? A. 2023 B. 2021 C. 2022 D. 2020 Answer: 2022 (C) The Ekofisk production license was extended to 2048 in April 2022. 24. Which of the following is NOT a drive mechanism for the Ekofisk reservoir? A. Water Drive B. Pressure depletion C. Solution Gas Drive D. Compaction Drive Answer: Water Drive (A) The Ekofisk reservoir is characterized by four drive mechanisms: Pressure depletion, Solution Gas Drive, Water Drive, and Compaction Drive. 25. What was the approximate decrease in porosity of the Ekofisk Chalk due to compaction? A. 1 mD B. 0.25 mD C. Unknown D. 50-100 mD Answer: 50-100 mD (D) Despite the matrix permeabilities being less than 1 mD, the presence of natural fractures in the Ekofisk Chalk reservoir results in an effective permeability of 50-100 mD. 26. What was the estimated final primary recovery factor of the Ekofisk reservoir? A. 60% B. 20% C. 80% D. 40% Answer: 20% (B) The development plan for the Ekofisk reservoir aimed for a 20% recovery factor via Pressure depletion / Solution Gas Drive. 27. Which drive mechanism contributed the most to the secondary recovery of the Ekofisk reservoir? A. Pressure depletion B. Water drive C. Solution gas drive D. Compaction drive Answer: Water drive (B) The secondary recovery of the Ekofisk reservoir was primarily driven by water injection. This technique involves injecting water into the reservoir to maintain pressure and displace the oil towards the production wells. 28. What was the approximate increase in expected recovery from the water injector at Ekofisk? A. 5% B. 20% C. 15% D. 10% Answer: 10% (D) The water injector at Ekofisk was expected to increase the recovery factor by approximately 10%. This means that an additional 10% of the original recoverable reserves could be extracted from the reservoir. 29. What was the approximate decrease in porosity of the Ekofisk Chalk due to compaction? A. 10% B. 5% C. 15% D. 20% Answer: 20% (D) The compaction of the Ekofisk Chalk resulted in a decrease in porosity of approximately 20%. This reduction in pore space contributed to the overall decrease in reservoir volume and affected the recovery factor. 30. What was the estimated final primary recovery factor of the Ekofisk reservoir? A. 20% B. 24% C. 10% D. 15% Answer: 24% (B) The estimated final primary recovery factor of the Ekofisk reservoir was approximately 24%. This includes the contribution from the compaction drive, which is a mechanism that occurs due to the decrease in pore pressure and leads to oil displacement.