Well Control Quiz N°5

Tutorial prepared by Eltun Talibov, Drilling Engineer at State Oil Company of AZERBAIJAN REPUBLIC (SOCAR). 
For the answers:   LinkedIn contact: Eltun Talibov ,  Email: Eltun-talibov98@mail.ru

1. Problems that occur during a killing operation may affect various pressure parameters. They are: 

a. Drill pipe pressure 

b. Casing pressure 

c. Bottom hole pressure 

For each of the following problems indicate how you would recognize these problems. 

For an increase: + 

For a decrease: - 

For no change: = 

2. Why can a pressure build up in the Mud Gas Separator be dangerous? (Choose ONE answer). 

a. May allow gas to enter shale shaker area. 

b. Will affect Drill Pipe pressure. 

c. Will increase risk of lost circulation. 

d. Will allow gas to be blown along the Vent Line. 

3. Whilst circulating out a kick, the mud pump fails. What is the first action to take? (Choose  ONE answer). 

a. Shut the well in. 

b. Fix pump as soon as possible. 

c. Change over to  pump N°2. 

d. Divert the well. 

4.  Shoe at = 6,000 ft 

     TVD at = 9,000 ft 

     Mud Weight = 11.4 ppg 

     Collar Capacity = .0077 bbls/ft 

     Collar Displacement = .033 bbls/ft 

     Collar Length = 1000 

     Pipe Capacity = .0178 bbls/ft 

     Pipe Displacement = .0082 bbls/ft 

     Pipe to Casing Annulus = .052 bbls/ft 

     Pipe to Open Hole = .046 bbls/ft 

     Collars to Open Hole = .029 bbls/ft 

Well starts to flow after 50 stands pulled. 

Shut-in Data is: 

Bit Depth = 4350 ft 

Influx = 38 bbls 

SICPP = 400 psi 

Influx Gradient = .12 psi/ft 

Answer the following question (assume no gas migration). 

a. Calculate the volume to bleed off to strip back to bottom? 

b. What should happen to Casing Pressure as string is stripped into influx? 

a) increase b) decrease c) stay the same 

5. During a kill operation, there is a time delay between operating the choke and observing a change in the Drill Pipe Pressure. This delay is approximately: (Choose ONE answer). 

a. 1 second per 1000 feet of hole length 

b. 5 to 10 seconds 

c. 5 to 10 minutes 

d. 750 feet per minute 

6. How should the Choke Manifold be lined up, when drilling, for a Hard Shut-in procedure? 

a. b. c. d.	Side outlet valve on BOP closed. Choke Line open through remote adjustable choke. Remote adjustable choke closed.
	Side outlet valve on BOP open. Choke Line open through manual choke. Remote choke open.
	Side outlet valve on BOP open. Choke Line open through remote adjustable choke. Manual choke closed.
	Side outlet valve on BOP closed. Choke Line open through remote adjustable choke. Remote adjustable choke open.

7. Which of the following is not a kick warning sign? (Choose ONE answer). 

a. Increase in mud temperature. 

b. Gas cut mud. 

c. Flow rate increase. 

d. Connection gas. 

e. Increase in pump pressure. 

8. Gas/Water Contact in a Reservoir = 6000 ft 

    Top of Reservoir is at 5000 ft. 

Gas Gradient = 0.1 psi/ft 

Formation Water Gradient = 0.465 psi/ft Calculate pressure at top of the reservoir? 

a. 2511 psi 

b. 140 psi 

c. 2690 psi 

d. 2231 psi 

9. Mud losses are 20 bbls per hour. 

    Annular Capacity = .1252 bbls/ft 

    Mud Density = 12 ppg 

What would be the effect on bottom hole pressure if the hole was not filled for a period of 2 hours? (Choose ONE answer). 

a. decrease by 320 psi 

b. decrease by 200 psi 

c. decrease by 150 psi 

d. decrease by 470 psi 

10. Swabbing is due to: 

a. An increase in bottom hole pressure while tripping. 

b. A reduction in bottom hole pressure while tripping. 

c. A kick 

d. Lost circulation.

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