Well Control Subsea Equipment exercise

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Well Control Subsea Equipment exercise – ยากขึ้นอีกนิดครับ ไม่นิดล่ะ โคตรยากเลย กว่าจะเข้าใจและสอบผ่าน หืดขึ้นคอ

แต่ก็ขึ้นกับเรานะครับว่า จะเรียนและสอบทั้งแบบ surface well control หรือ subsea well control เราเลือกได้ ค่าเรียนค่าสอบเท่ากัน แต่ใครเลือก 2 อย่าง ก็ต้องสอบให้ผ่านทั้งสองอย่าง ไม่งั้นถือว่าไม่ผ่าน

IWCF

ดังนั้น ถ้าไม่ชัวร์ ส่วนมากก็จะสมัครไปอย่างเดียวกัน surface well control ง่ายกว่า เอาจริงๆ การคำนวน ทฤษฎีต่างกันนิดเดียว แต่ที่ปวดกระบาลคือ subsea นั่นแหละ เครื่องมืออุปกรณ์มันเยอะกว่า โดยเฉพาะคนไม่เคยเห็น ไม่เคยจำ จะมโนยากมาก

กฎระเบียบการขุดเจาะ Entry level กรอบความรู้ วิศวกรรมการขุดเจาะหลุม ตอนที่ 5

Well Control Subsea Equipment exercise

เอาล่ะครับ ลุยทำกันเลย 29 ข้อ …

1. On a floating rig with an indirect hydraulic control system manifold regulators are used in the Subsea control pods to regulate power fluid. Which of the following hydraulic BOP functions are operated using this regulated power fluid? (Select SIX answers)

a) Annular BOPs.
b) Ram BOPs.
c) Riser Connector.
d) Wellhead Connector.
e) Wedge Locks.
f) Fail safe valves.
g) Mini collet connectors.
h) Diverter.

4 points

2. What is the maximum allowed response time for a subsea annular preventer according to API RP 53?

a) 30 seconds.
b) 45 seconds.
c) 1 minute.
d) 2 minutes.
e) Less than 15 minutes.

2 points

3. Which of the following statements describe the functions performed by the pilot control lines in the pod control hose? (Select FOUR answers)

a) Pilot lines allow regulation of the subsea regulators inside the control pods.

b) Pilot lines can be activated by the four way manipulator valves on the hydraulic closing unit.

c) Pilot lines operate SPM valves which allow hydraulic fluid to flow to the relevant BOP function.

d) Pilot lines are activated by manifold pressure.

e) Pilot lines are operated by annular pressure.

f) Pilot lines are operated by pilot pressure which is supplied by the accumulators.

4 points

4. Which of the following statements best describe a manipulator valve?

a) A manipulator valve is a 3 position 4 way valve that when activated allows regulated power fluid to be directed to the relevant SPM valves in the control pods.

b) A manipulator valve is a 3 position 4 way valve that when activated directs unregulated power fluid to the active pod on the subsea stack.

c) A manipulator valve is a 3 position 4 way valve that when activated directs regulated pilot pressure to the relevant SPM valves in the active control pod.

d) A manipulator valve is a 3 position 4 way valve that when activated allows pilot pressure to be directed to the relevant SPM valves in the control pods.

2 points

5. When a ram BOP is activated to the close position from the remote and/or central hydraulic control unit on a floating rig, certain functions occur. Identify the correct functions from the list below. (Select TWO answers)

a) An SPM valve fires in the active pod only.

b) SPM valves fire in both the active and redundant pods.

c) The ram open SPM valve or valves will be vented.

d) The ram closed SPM valve or valves will be vented.

4 points

6. Figure below illustrates a Sub Plate Mounted valve (SPM) used in the In-direct hydraulic control system in a Subsea BOP system. Identify whether the valve is in the open or closed position.

a) The SPM valve is in the open position, allowing hydraulic fluid to flow to the BOP function.

b) The SPM valve is in the closed position allowing power fluid from the BOP function to be vented.

2 points

7. What is the function of the “memory button‟ found on subsea BOP remote panels?

a) To identify the correct position of the BOPs if the remote panel lights fail.

b) To identify which position a BOP was in prior to being put into block.

1 point

8. Power fluid travelling through a SPM valve is?

a) Regulated.
b) Un-regulated.

1 point

9. Subsea accumulator bottles should be pre-charged to:

a) The same as surface accumulator bottles.

b) The same as surface accumulator bottles plus the seawater hydrostatic pressure at the BOP stack.

1 point

10. Which of the following statements are true or false regarding riser flood valves?

a) The riser flood valve is pressure sensitive and will automatically open when the pressure inside the riser drops to 200 to 300 psi below the ambient seawater hydrosatic pressure. True/False

b) The riser flood valve can be remotely operated and reset through surface control lines. True/False

c) The riser flood valve prevents the riser system from collapse. True/False

1 point of each correct answer

11 From the list below match the following BOP manufacturers to the corresponding automatic ram BOP locking systems.

1-Cameron

2-Hydril

3-Shaffer

4-Val-Con

Place the corresponding number (1 to 4) in box next to the correct locking device.

a) Multi Position Lock (MPL). ______
b) Ultra Lock. ______
c) Wedge Lock. _____
d) Pos Lock. _____

1 point of each correct answer

12. Identify the main components of the Koomey indirect hydraulic control system (Refer to the below)

a) Control pod___ f) Wellhead connector___
b) Telescoping Joint___ g) Hydraulic unit___
c) Annular Preventer___ h) LMRP connector___
d) Hose Reel___ i) Drillers remote pane___
e) Choke/Kill lines ___

1 point of each correct answer

13. Identify the following components of the Wedge lock in the below Figure

a) Locking Wedge. ___ e) Piston___
b) Locking Port. ___ f) Tail Rod___
c) Extension Tail Rod.___
d) Unlocking Port. ___

1 point of each correct answer

14. When a Subsea BOP is put into the “Block‟ position:

a) Actuating pressure is removed from the SPM valves.

b) The SPM valves vent any pressure supplied to the BOP functions.

c) The rams remain closed or opened depending on their position prior to being put into block.

d) Power fluid is prevented from entering the BOP operating chambers.

e) All of the above.

2 points

15. The following ten events take place as a sub-sea ram BOP is functioned to the close position from the Drillers remote panel.

1. Unregulated pilot pressure arrives at the control pods lifting the relevant SPM valves on both Pods.

2. The “push to operate‟ button is depressed at the same time as the “Ram close‟ button is depressed.

3. Regulated Power fluid passes through a shuttle valve to the close chamber of the BOP.

4. The ram close solenoid allows air to flow to the air piston on the manipulator valve at the hydraulic control unit.

5. The 4-way manipulator valve moves to the close position.

6. The lights on the remote panel change from green (open) to red (close).

7. Manifold and Accumulator pressure decrease.

8. Power fluid fills up the closing chamber of the BOP, the power fluid in the opening chamber is directed to the relevant closed SPM valve and is vented at the Pod.

9. The BOP is closed and manifold pressure returns to 1500 psi.

10. Unregulated Power fluid from both surface and subsea accumulators starts to travel through the manifold regulator, and allows regulated power fluid to travel through the relevant SPM on the active pod.

From the above list of events please arrange the list of events shown below into the correct order from first to last.

• a) First event is number ____
• b) Second event is number ____
• c) Third event is number ____
• d) Fourth event is number ____
• e) Fifth event is number ____
• f) Sixth event is number ____

5 points

16. What is the maximum response time for a Sub-sea Shear Ram BOP according to API RP 53?

a) 30 seconds.
b) 45 seconds.
c) 60 seconds.

1 point

17. The below Figure illustrates a Cameron Model “D” type annular preventer.

Place the corresponding number in box next to the correct component description.

a) Quick release top. ____
b) Piston. ____
c) Pusher plate. ____
d) Hydraulic closing port. ____
e) Ring groove ____

1 point of each correct answer

18. Which of the following locking systems requires separate hydraulic control lines?

a) Wedge Lock.
b) Ultra Lock.
c) Pos Lock.
d) MPL.

1 point

19. On a ram type preventer, on a surface stack, in which position will the 4-way valve be put to assist with the removal of the bonnet after backing off the bonnet bolts?

a) Open.
b) Close.
c) Neutral (Block).
d) Any position, it does not matter.

1 point

20. Which of the following are disadvantages when using a float valve? (Select THREE answers)

a) If reverse circulation is required.
b) For obtaining drill pipe shut in pressure reading.
c) To prevent flow back while tripping.
d) Minimising surge pressure.

4 points

21. Which piece of equipment on a floating rig is considered to be the weakest point when diverting a shallow gas kick?

a) The seals between marine riser joints.
b) The ball joint on the lower marine riser package.
c) The ball joint on the diverter housing.
d) The slip joint packers.
e) The insert packer (annular packing element).

2 points

22. An accumulator cylinder at surface has a pre-charge pressure of 1000 psi. The pressure gradient for sea water is 0.445 psi/ft.

What will be the correct pre-charge pressure if the cylinder is used subsea in 1000 feet of water?

a) 555 psi
b) 445 psi
c) 1445 psi

3 points

23. The below Figure illustrates the main components of the Lower Marine Riser Package (LMRP) used for subsea drilling operations.

Place the corresponding number in box next to the correct locking device.

a) Connector. _____
b) Annular Preventer. _____
c) Flex Joint. _____
d) Control Pod. _____

1 point of each correct answer

24. The below Figure illustrates a style of diverter commonly used when drilling with a Subsea BOP. Match the correct numbers to the descriptions below
    1 point of each correct answer

a) Drill pipe. ___
b) Standard (outer) packer. ___
c) Diverter packer closing port. ___
d) Flow line seals. ___
e) Insert packer lockdown dogs. ___

1 point of each correct answer

25. The below Figure illustrates a Hydril GL annular BOP. Which of the following statements are correct when this preventer is used in a Subsea operation?

(Select TWO answers)

a) The secondary chamber allows balancing the opening force of the piston created by drilling fluid hydrostatic pressure in the marine riser.

b) Lowest required hydraulic closing pressure when closing chamber and secondary chamber are connected.

c) Lowest required hydraulic closing pressure when opening chamber and secondary are connected.

3 points

26. Which one of the following statements about the “Memory Function” on a Subsea BOP Driller‟s panel is true?

a) Memory Function indicates the previous position of the stack function before the “Block position” was selected.

b) Memory Function indicates a malfunction by giving a permanent light on the alarm panel after an alarm has been acknowledged and the audible alarm has stopped.

c) Memory Function reminds the Driller to add anti-freeze fluid when the temperature drops below a set level.

d) Memory Function reminds the Driller to engage wedge locks before hanging off the drill string on the ram BOPs.

3 points

27. On a subsea BOP installation, what is the advantage of using a kill line gauge to monitor changes in pressure during a well kill operation?

a) The kill gauge is always more accurate.

b) The effect of choke line friction is reduced to a quarter when monitoring of the kill line gauge during the kill operation.

c) Maintaining a constant pressure on the kill line gauge when starting or stopping the pump compensates for the effect of choke line friction.

d) The effect of choke line friction is reduced to a half when monitoring on the kill line gauge during the kill operation.

2 points

28. The below Figure illustrates part of the hydraulic “principle of redundancy” utilised to control functions on the subsea BOP stack. Which statement about the Shuttle valves on a subsea BOP stack is correct?

a) The Shuttle valves require 3000 psi to operate.

b) The Shuttle valves are directly controlled by pilot fluid.

c) The Shuttle valves are 3 position/4 way valves.

d) The Shuttle valves isolate the control fluid system between the active and the redundant pods.

e) The Shuttle valves isolate the hydraulic pilot system from the hydraulic control system. 3 points

29. When is the accumulator bank isolation valve closed on a hydraulic BOP control unit according to API RP 16E?

a) During drilling ahead.

b) During the testing of the BOP’s.

c) During any testing of accumulator unit, transportation and servicing.

d) When filling the reservoir with soluble oil.

3 points

Answers

1. B, C, D, E, F, G
2. C
3. A, B, C, F
4. D
5. B, C
6. A
7. B
8. A
9. B
10. a) True
    b) True
    c) True
11. a) 2, Hydril
    b) 3, Shaffer
    c) 1, Cameron
    d) 3, Shaffer
12. a) 6, Control Pod
    b) 7, Telescoping Joint
    c) 3, Annular Preventer
    d) 4, Hose Reel
    e) 5, Choke and Kill lines
    f) 8, Wellhead Connector
    g) 2, Hydraulic Unit
    h) 9, LMRP connector
    i) 1, Drillers remote panels
13. a) 3, Locking Wedge
    b) 4, Locking Port
    c) 5, Extension Tail Rod
    d) 1, Unlocking Port
    e) 2, Piston
    f) 6, Tail Rod
14. E
15. 2, 4, 5, 6, 1, and then 7
16. B
17. a) 1, Quick Release Top
    b) 8, Piston
    c) 7, Pusher Plate
    d) 9, Hydraulic Closing Port
    e) 5, Ring Groove
18. A
19. B
20. A, B, D
21. D
22. C
23. a) 7, Connector
    b) 5, Annular Preventor
    c) 1, Flex Joint
    d) 6, Control Pod
24. a) 9, Drill Pipe
    b) 7, Standard (Outer) Packer
    c) 5, Diverter Packer Closing Port
    d) 4, Flow Line Seals
    e) 8, Insert Packer Lockdown Dogs
25. A, B
26. A
27. C
28. D
29. C

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