Gas Lift Quiz

The following questions are taken from my gas lift class. Test your knowledge about gas lift.

1. What is the most appropriate system for an offshore naturally flowing well?
a) Continuous
b) Intermittent
c) PAIL

2. What does a two pen chart measure?
a) Production and Injection Pressure
b) Injection Pressure and Injection rate
c) Injection Pressure, Injection meter differential and Production Pressure

3. What two things should be obtained with a flowing survey?
a) Annotated two-pen chart and static survey
b) Welltest and annotated two-pen chart
c) Static and acoustic surveys

4. What is the most likely reason for disagreement between a flowing survey and a production pressure model??
a) Failed pressure gauge
b) Wrong model used
c) Poor gas measurement
d) Poor liquid measurement

5. The system solution is?
a) The expected lift gas and production rate
b) The best lift gas rate
c) The expected production rate and flowing bottomhole pressure
d) All of the above

6. Injection pressure operated valves are also known as?
a) Pressure valves
b) Fluid valves
c) PPO valves

7. Pick the best valve type for a dual well with one string flowing?
a) PPO
b) IPO

8. Pick the best valve type for a well producing into a common header so that it cannot be tested alone?
a) PPO
b) IPO

9. The primary opening force in a PPO valve is?
a) spring force
b) production pressure applied to the bellows less stem area
c) injection pressure applied to the stem

10. Position the top valve?
a) At the intersection of the injection pressure and the unloading gradient starting at the surface at the FTP
b) Where at least 1380 kPa (200 psi) differential exists between the injection pressure and the static pressure
c) 150 - 300 meters (500 - 1000 feet) below the static fluid level.

11. The transfer pressure is
a) The highest production pressure where sufficient differential exists to allow gas to enter at the next deeper mandrel.
b) The highest injection pressure where sufficient differential exists to allow gas to enter at the next deeper valve.
c) The highest production pressure where sufficient differential exists to allow gas to enter at the next deeper valve.

12. Which type of valve needs the largest pressure drop in an IPO valve design??
a) Large port
b) Small port
c) Large choke
d) Small choke

13. The transfer pressure for a PPO valve should be checked against?
a) The lowest injection pressure
b) The expected production pressure
c) The equilibrium curve pressure

14. The transfer pressure for an IPO valve should be checked against?
a) The lowest injection pressure
b) The expected production pressure
c) The equilibrium curve pressure

15. For IPO valves, injection pressure drop and ______________ help keep valves closed as the well unloads.?
a) temperature increases
b) production pressure decreases
c) All of the above

16. The minimum spacing for the mandrels should be?
a) limited by wireline retrieval capability
b) related to incremental well production
c) generally set to yield 8-12 mandrels

17. If the equilibrium curve pressure at a valve is 2000 and the transfer pressure is 1900 you can conclude?
a) The well can unload to the next deeper valve
b) The well cannot unload to the next deeper valve
c) Nothing without more information

18. What should be the maximum rate of lift gas into a well if: the operating valve's throughput capacity is 450, the economic optimum is 400, and the technical optimum is 800.?
a) 450
b) 400
c) 800

19. A chart recorder shows the injection rate, the surface tubing pressure and the injection pressure all dropping. What is this a symptom of??
a) Wellhead choke plugging
b) GLV plugging
c) Injection choke plugging
d) None of these

20. Gas lift orifice meters almost always read _____ than the actual rate. This tends to ________ the calculated (formation gas) GOR.?
a) higher / decrease
b) lower / increase
c) lower / decrease
d) higher / decrease