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Assessment
1. What is the major advantage of nitrogen drilling?
A .Enhanced cuttings transport
B .Cheaper than air drilling
C .Not flammable with hydrocarbons ✔
D .A, B and C
2. Which of the following is NOT a technique used to supply nitrogen for underbalanced drilling operations?
A. Liquid (Cryogenic) nitrogen supply
B. On-site generated nitrogen (Membrane filter)
C. Synthetic generation ✔
3. What is the boiling temperature of nitrogen?
A. -321 oF ✔
B. -121 oF
C. -21 oF
D. 21 oF
4. How much gaseous nitrogen is obtained from each gallon of liquid nitrogen?
A. Approximately 20 scf
B. Approximately 50 scf
C. Approximately 100 scf ✔
D. Approximately 500 scf
5. Ambient temperature and ground elevation normally do NOT have a significant effect on nitrogen purity in membrane filtration technique.
A. True
B. False ✔
6. What is the major limitation of nitrogen drilling operation?
A. Regulations
B. Risk of downhole fires
C. Mud ring formation
D. Cost ✔
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