Coiled Tubing Well Control Quiz
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Coiled tubing units are widely utilized for both drilling and completion operation. There are wide ranges of jobs which the coiled tubing can perform nowadays. Most operators use these units to work against wellbore pressure. Therefore the well control is always the main concern. This quiz will cover the details of coiled tubing well control. To maximize your learning, you need to think throughout prior to select any answer. For some question, you may need to use a calculator to figure out the solution. Enjoy the test.
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Question 1 of 17
1. Question
The coiled tubing unit works against wellbore pressure. While pulling out of hole, crew observe the hole in the coil between a stripper and an injector. After stopping the circulation, the flow still continues.
What should you do first?
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Question 2 of 17
2. Question
For each round trip, how many bending cycles and bending events is the coiled tubing exposed to?
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Question 3 of 17
3. Question
1.5” coiled tubing is run inside 3-1/2” production tubing for drilling out a bridge plug set in the production tubing.
The brine weight is 12.1 ppg used for this operation. There is some uncertainty about the formation pressure below the bridge plug.
The perforated zone below the plug is 11,000’MD / 9,000’ TVD. While drilling out the bridge plug, the well control situation occurs.
The well is shut in and stabilized tubing pressure is 500 psi.
What is the required kill weight fluid to kill this well?
Correct
Kill weight mud = 12.1 + (500 ÷(0.052 x 10,000)) = 13.1 ppg (round up figure)
Incorrect
Kill weight mud = 12.1 + (500 ÷(0.052 x 10,000)) = 13.1 ppg (round up figure)
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Question 4 of 17
4. Question
According to API standard, what is the maximum acceptable limit for ovality of coiled tubing?
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Question 5 of 17
5. Question
Running the coiled tubing and pumping high pressure at the same time.
What will happen to the numbers of bend cycles before the fatigues are occurred?
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Question 6 of 17
6. Question
What is the main function of the stripper assembly in the coiled tubing unit while working against wellbore pressure?
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Question 7 of 17
7. Question
What is the standard quad coiled tubing BOP stack arrangement?
Start from top to bottom.
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Question 8 of 17
8. Question
Which of the following statement is not true regarding slip rams in a coiled tubing unit?
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Question 9 of 17
9. Question
Which one is not a function of the injector assembly in the coiled tubing unit?
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Which one is NOT a function of the injector assembly in the coiled tubing unit?
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Which one is NOT a function of the injector assembly in the coiled tubing unit?
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Question 10 of 17
10. Question
What is the most concerning ovality of the coiled tubing?
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Question 11 of 17
11. Question
While the coiled tubing unit is performing the operation, 10 bbl kick was noticed and the well is shut in immediately. Coiled tubing string size = 1.5” and ID of the production tubing is 3”.
What is the length of kick? Assume the water based case for this calculation.
Correct
Annular capacity (bbi/ft) = (32 -1.52) ÷ 1029.4 = 0.006557 bbl/ft
Kick length = 10 ÷ 0.006557 = 1525 ft
Incorrect
Annular capacity (bbi/ft) = (32 -1.52) ÷ 1029.4 = 0.006557 bbl/ft
Kick length = 10 ÷ 0.006557 = 1525 ft
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Question 12 of 17
12. Question
What is the recommended connection type between the x-mas tree and the coiled tubing stack?
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Question 13 of 17
13. Question
There is 8,500 ft of coiled tubing in the hole and 3,000 ft on the reel. The ID of the coiled tubing is 1.2”. Pump out put is 0.042 bbl/stk.
How many strokes required to displace fluid from surface to the end of the coiled tubing?
Correct
Total length of coiled tubing = 3,000 + 8,500 = 11,500 ft
Coiled tubing capacity = 1.22 ÷ 1029.4 = 0.0014 bbl/ft
Total capacity of coiled tubing = 16.1 bbl.
Total stroke = 16.1 ÷ 0.042 =383 strokes
Incorrect
Total length of coiled tubing = 3,000 + 8,500 = 11,500 ft
Coiled tubing capacity = 1.22 ÷ 1029.4 = 0.0014 bbl/ft
Total capacity of coiled tubing = 16.1 bbl.
Total stroke = 16.1 ÷ 0.042 =383 strokes
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Question 14 of 17
14. Question
Which type of stripper has a major concern about coiled tubing buckling?
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Question 15 of 17
15. Question
Which type of stripper assembly is recommended as a backup in high pressure application for coiled tubing operation?
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Question 16 of 17
16. Question
Where is the majority of bending stress occurred at the coiled tubing?
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Question 17 of 17
17. Question
There is 500 psi pressure trap below 4” ID BOP stack with 2.2” coiled tubing inside the ram.
How much force is pushed against the coiled tubing?
Correct
Force = Pressure x Area
Force = 500 x (π ÷ 4) x 2.22 = 1900 lb
Incorrect
Force = Pressure x Area
Force = 500 x (π ÷ 4) x 2.22 = 1900 lb
Leaderboard: Coiled Tubing Well Control Quiz
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thanks
To test my understanding on CT
Thanks for the question it was very good practice
Thank you for the quiz to refreish me my mind.