IWCF COMBINED SUPERVISOR EQUIPMENT PAPER NO. 1. Name:
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Date:
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Start time:
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Finish time:
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Mark:
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Percentage Mark:
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Training Centre Name:
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Invigilator Name:
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Invigilator Signature:
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Duration:
One hour (1 hour)
Total paper value:
164 marks
All questions require only ONE answer unless otherwise stated.
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1:
From the eight illustrations shown on pages 1, 2 and 3 match the correct number to each one of the names listed below. a.
Upper Kelly Cock.
b.
Cup type tester.
c.
Dart landing sub.
d.
Drop in Check Valve.
e.
Non-return float.
f.
BOP test plug.
g.
Flapper float.
h.
Lower Kelly Cock.
1
2
1 mark for each correct answer
1 cont:
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3
4
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3
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1 cont:
7
2:
8
From the figure below Alert 020 identify the API clamped hub. B
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Alert 020 A
B
C
d 3 marks
3:
Select the correct answers from the list below why a weep hole is required on a ram BOP. TWO answers required. a.
To allow the installation of a grease nipple. With a grease nipple installed the weep hole is used for greasing the ram shaft.
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b.
The weep hole prevents leakage through the primary ram shaft packing from the well bore to the hydraulic opening chamber.
c.
The weep hole allows visual inspection of the ram shaft and should be plugged with a bull-plug between inspections.
d.
The weep hole indicates if the primary ram shaft packing is leaking well bore fluid.
e.
The weep hole is a grease release port that prevents over-greasing of the ram shaft packing.
e f
3 marks 4:
What is meant by the terms, Primary and Secondary seals, when used in connection with ram BOP’s. a.
The Primary seal is closing in the well using the annular. The Secondary seal is closing in the well using the rams after the annular has been closed.
b.
The Primary seal is a seal established by a ring gasket between connections on the side outlets or on end outlets. The Secondary seal is a seal established by a ring gasket covered with Teflon tape.
c.
The Primary seal is a well control method utilising mud hydrostatic pressure. The Secondary seal is a well control method utilising both mud hydrostatic pressure and the BOP to balance the formation pressure.
d.
The Primary seal is the mechanical ram shaft packing. The Secondary seal is plastic packing injected to activate an additional seal on the ram shaft in an emergency should the Primary seal be leaking. 3 marks
5:
Match the indicated items on the Cameron U ram, Figure Alert 019 to the list below.
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Alert 019 “O” Rings for Operating Cylinder
Bonnet Seal
Side Outlet
Bonnet Stud
Operating Cylinder
Seal Rings
Locking Screw Housing
Ram Change Piston
Operating Piston
Ram Locking Screw
Ram Assembly
Body
Emergency Mud Seal
Intermediate Flange
Bonnet Assembly
Ram Change Cylinder 6:
1 mark for each correct answer
Identify the parts of the Cameron Blind/Shear ram in Figure Alert 040 shown below.
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Alert 040 Lower Ram Assembly
Blade Packer
Top Seal
Upper Ram Assembly
Side Packers
Upper Ram Body 1 mark for each correct answer
7:
Select from the Ram Locking Systems listed below the type of system that compensate for front packer wears.
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g
a.
Cameron Wedgelock.
b.
Shaffer LWS Poslock.
c.
Shaffer LWS Manual-lock.
d.
Hydril MPL.
e.
Koomey Autolock. 2 marks
8:
When Annular BOP’s are pressure tested, it often happens that the test pressure cannot be held constant but has to be re-pressurised several times before a constant value is obtained. Select the correct answer from the list below. a. Annular BOP’s always leak until the packing unit finds its new shape. This can take several minutes. b. The compressibility of the hydraulic fluid from the accumulator unit below the closing piston effects the test pressure to drop. c. The packing unit rubber is forming a new shape. As well as being effected By hydraulic pressure. Test pressure also effects the deformation of the packing unit and results in a decrease in pressure. 3 marks
9:
During the diverting of a shallow gas kick from a marine riser a risk occurs which effects the integrity of the riser. Select the correct answer from the list below. a.
The riser may burst from the excess pressure exerted by the gas inside it.
b.
Riser collapse may occur.
c.
Buoyancy forces acting on the riser may require that the riser tension is held in excess of the situation where the riser is full of drilling fluid. 2 marks
10:
Match the items listed on the Hydril GL Annular Preventer, Figure Alert 017 below to the correct numbers.
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Alert 017 Opening Chamber Port.
Piston Seals.
Closing Chamber Port.
Balancing Chamber Port.
Secondary Chamber.
Piston.
Latched Cap.
Element.
Opening Chamber Head.
1 mark for each correct answer
11:
On the rig floor there is only one Drill Pipe Safety Valve with NC50 (41/2” IF) pin/box connections. The drill string and BHA consist of: 5” drill pipe (NC50) 5” HWDP (NC50) 8” (65/8” Reg.) Drill Collars. Select from the list below the correct crossover sub required for safe tripping operations.
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a. NC50 (41/2” IF) Box x 65/8” Reg. Pin. b. NC50 (41/2” IF) Box x 75/8” Reg. Pin. c. NC50 (41/2” IF) Pin x 65/8” Reg. Box. d. 65/8” Reg. Box x 75/8” Reg. Pin. 2 marks 12:
Select the correct answers if a non-ported conventional flapper float valve is run in the bit sub when tripping in the hole? THREE answers required. a. It increases the hydraulic collapse pressure on the drillpipe if it is not filled. b. Tripping time is increased. c. Reverse circulation can be performed during drilling or tripping. d. The float increases back-flow through the drill string. e. It reduces surge pressure on the formation. f. It reduces back-flow from the drillstring. g. SIDPP can be accurately monitored during Well Control operations. 4 marks
13:
Which gas must be used to pre-charge the accumulator bottles on the BOP hydraulic control unit? a. Air. b. Nitrogen. c. Oxygen. d. Carbon Dioxide.
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e. Hydrogen Sulphide. 1 mark 14:
What are the purposes of having stored fluid under pressure in the accumulator bottles for the BOP hydraulic control unit? TWO answers required. a. To reduce the closing time of BOP functions. b. To enable the BOP to be operated if the rig power fails. c. To displace mud when the BOP is being tested. d. To hydraulically operate the remote choke. e. To operate the BOP failsafe valves. 3 marks
15:
What is the main function of the choke valve in the overall BOP system? a. To direct drilling fluid to the mud tank b. To direct well fluids to the overboard line. c. To shut-in the well softly. d. To control the backpressure while circulating out an influx. 2 marks
16:
If a BOP stack is being tested with a test plug or cup tester, a method of monitoring for communication from below the test tool to atmosphere is required. Select the correct answer from the list below. a. Because the test will create extreme hook loads. b. Because of potential damage to the open-hole and casing. c. Otherwise reverse circulation will be needed to release the tool. d. To avoid swabbing a kick during the test. 2 marks
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17:
What is meant by the API term “closing ratio” for a Ram BOP? a. The ratio between closing volume and opening volume. b. The ratio of the well head pressure to the pressure required to close the BOP. c. The ratio between closing time and opening time. d. The ratio between the Rated Working Pressure for the BOP and the Rated Working Pressure for the hydraulic BOP control unit. 1 mark
18:
What is the correct position of the selector valves, 3-position/4-way valves on the BOP accumulator unit while drilling ahead with a surface BOP stack installed? a. All valves in open position. b. All valves in closed position. c. All valves in block position. d. Valves open or closed, depending on BOP stack function. 3 marks
19:
What happens on a BOP accumulator control unit on a land rig if the UNIT/REMOTE selector switch is placed in UNIT position: a. All BOP functions can be operated from the Driller’s Remote BOP Control Panel. b. No BOP functions can be operated from the Driller’s Remote BOP Control Panel. c. The annular pressure regulator cannot be adjusted from the Driller’s Remote Panel. d. The air-operated pumps are isolated. 2 marks
20:
Are all ram BOP’s designed to be closed on Rated Working Pressure in the wellbore when the manifold pressure is 1500 psi. Yes
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1 mark 21:
According to the recommendations in API RP53 what is the closing time for a 211/4” surface annular BOP: a. Less than 30 seconds. b. Less than 45 seconds. c. Less than 2 minutes. 2 marks
22:
Which part of the riser equipment on a floating rig should be considered as the weakest point in the system when diverting or drilling? a. The ball joint on the Lower Marine Riser Package. b. The seals between riser joints. c. The slip joint packer elements. d. The ball joint on the Diverter housing. e. The annular packing element. 3 marks
23:
In the Figures Alert 037 & Alert 038 illustrated below are the profiles of two API flanges.
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Alert 037: API Type 6B
Alert 038: API Type 6BX Which one of the above flanges requires that the torque on the bolts, studs and nuts be? checked at regular intervals. API Type 6BX
API Type 6B 3 marks
24:
Based on the diagram of a Mud Gas Separator, Figure Alert 026 below with a mud weight of 8.9 ppg flowing through the MGS and liquid seal, how much hydrostatic pressure (backpressure) would have to be overcome to allow gas to vent to the shale shakers if the height of the liquid seal is 28 ft.
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Alert 026 Answer
4 marks
25:
Figure Alert 045a on the following page (page 17) shows a standard BOP hydraulic control system for a surface installation. Match the items listed to below to the correct number on Figure Alert 045a. a. Electric triplex pump assembly.
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b. Accumulator bank isolator valves. c. Accumulator pressure gauge. d. Manifold pressure gauge. e. Annular pressure transmitter. f. Hydro electric pressure switch. g. Annular pressure gauge. h. 3 position valve. i. Annular regulator. j. Unit/Remote switch. k. Accumulator pressure relief valve. l. Air pump. m. Manifold regulator. n. Accumulator bottle bank. o. Pneumatic pressure switch. p. Hi/Lo bypass. q. Manifold pressure transmitter. r. Accumulator pressure transmitter. 1 mark for each correct answer
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Alert 045a. 26:
From the drawing below, Figure Alert 007 of a surface installed BOP stack answer the questions 26 a, b & c.
26a.
Alert 007 The well has been shut in as the result of a kick. Is it possible to kill the well using the Drillers Method if the upper pipe rams are closed? Yes
No 2 marks
26b.
The well has been shut in as the result of a kick. Is it possible to kill the well using the Drillers Method if the blind/shear rams are closed? Yes
No 2 marks
26c.
The well has been shut in as the result of a kick. Is it possible to kill the well using the Drillers Method if the lower pipe rams are closed? Yes
No 2 marks
27:
From the list below select the reason why a Riser Fill-Up Valve might be installed in a marine riser. a. To increase buoyancy on the riser in order to relieve the riser tensioning system on the rig.
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b. To prevent the collapse of the riser when diverting a shallow gas kick. c. To reduce the pressure on the BOP stack when diverting a shallow gas kick. d. To save the time taken to fill the hole when tripping out. 4 marks 28:
The 3-position/4 way valves on a BOP accumulator unit are used to control stack functions. Select the correct answers from the list below. TWO answers required. a. The valve should be capable of manual operation. b. The valve cannot be remotely operated. c. The valve can be placed in 4 positions. d. The valve should have 4 active connections (inlets/outlets) 4 marks
29:
The position indicator lights on a Driller’s Panel for a sub sea BOP has a “Memory Function”. What is the purpose of the “Memory Function”. a. The Memory function indicates the previous position of the stack function before the BLOCK position was selected. b. The Memory function reminds the Driller to add anti-freeze fluid when the temperature drops below a set level. c. The 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. d. The Memory function reminds the Driller to engage Wedgelocks before hanging off the drillstring on the Rams. 2 marks
30:
A sub sea BOP control system is divided into a Control System and a Pilot System. Select from the list below which statement best describes the Pilot System. a. The Pilot System dumps fluid to the sea for each operation of a BOP Function. b. The Pilot System directly controls the position of all shuttle valves on the BOP stack. c. The Pilot System is a closed dead-end system.
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d. Pilot fluid is mixed from mainly potable water and a small amount of additives, and may be a more concentrated mixture than in the Control System. e. The fluid in the Pilot System flows continuously while a function on the BOP takes place. 4 marks 31:
From the list below indicate the correct statements relating to ram BOP’s? THREE answers required. a. Ram type BOPs are designed to contain and seal Rated Working Pressure from above and below the closed rams. b. Ram type BOPs are designed to contain and seal Rated Working Pressure only from above the closed rams. c. Ram type BOPs are designed to contain and seal Rated Working Pressure only from below the closed rams. d. Well pressure below closed rams will assist to maintain the rams closed. e. Pipe rams can be used to hang off the drill string in an emergency. 4 marks
32:
According to the recommendations in API RP 53, what is the minimum capacity of the hydraulic fluid reservoir on a BOP accumulator unit for a surface BOP system. a.
Twice the accumulator capacity.
b.
150% excess accumulator volume.
c.
Twice the hydraulic closing volume of the BOP.
d.
Twice the usable fluid volume of the accumulator system. 2 marks
33:
From Figure Alert 017a below, when this preventer is used in a sub sea operation, which of the statements below are correct. TWO answers required.
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Alert 017a a. The lowest required closing pressure is when the closing chamber and balancing chamber are connected. b. The lowest required closing pressure is when the opening chamber and balancing chamber are connected. c. The balancing chamber allows balancing the opening force on the piston created by drilling fluid hydrostatic pressure in the marine riser. 3 marks
34:
When a sub sea Annular Preventer is closed which of the following statements indicate that the function has taken place. FOUR answers required. a. Light change from Green to Red. b. Accumulator pressure decreases then increases.
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c. Rig air pressure decreases then increases. d. Manifold readback pressure decreases then increases. e. Manifold Pilot pressure decreases then increases f. Annular readback pressure decreases then increases. g. Annular Pilot pressure decreases then increases. h. Flowmeter runs then stops after the required volume of fluid. 5 marks 35:
From the list below which statement explains the advantage of using the kill line, open to the wellhead to monitor changes in pressure during a well kill operation? a. Maintaining a constant pressure on the kill line gauge while starting or stopping the pumps eliminate the effect of choke line friction. b. Bottom hole pressure can be accurately monitored by maintaining a constant pressure on the kill line gauge while pumping kill fluid to the bit. c. The effect of choke line friction is reduced to a half when monitoring on the kill line gauge during the kill operation. d. The effect of choke line friction is reduced to a quarter when monitoring on the kill line gauge during the kill operation. 5 marks
36:
From Figure Alert 052 shown below which statements are correct relating to shuttle valves?
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TWO answers required.
Alert 052 a. Shuttle valves are pilot operated. b. Shuttle valves allow retrieving of a malfunctioning pod without losing hydraulic BOP control. c. Shuttle valves automatically seal any hydraulic leaks in the active pod. d. Shuttle valves isolate pressurised control fluid communications between the active system and the redundant system. 3 marks
37:
The body test on a new BOP is subjected to a hydrostatic proof test prior to shipment from manufacturer. The BOP specifications: Rated Working Pressure:
IWCF Comb. Supv. Equip. Sept 05
15,000 psi 23
Nominal bore:
135/8”
Select from the list below the correct value for a hydrostatic proof test pressure for the above BOP specifications according to API recommendations. a.
15,000 psi
b.
17,500 psi
c.
20.000 psi
d.
22,500 psi
e.
25,000 psi 3 marks
38:
Stab-in values should at all times be placed on the rig floor ready of use, to fit the tubulars being used. 1:
FULL OPENING STAB-IN KELLYCOCK VALVE (full opening safely valve)
2:
NON-RETURN STAB-IN SAFETY VALVE (inside BOP/Gray Valve)
From the statements below, select the correct number from above to make a TRUE statement. a.
Has potential to leak through the valve crank sleeve.
b.
Will be useless without an operating key.
c.
Is kept in its open position by rod secured by a T-handle.
d.
Will not allow a wire-line to be run through it.
e.
Must not be run in the hole in the closed position.
f.
Has to be pumped open to obtain “shut in drill pipe pressure” 2 marks
39:
Which of the following procedures is correct to activate a BOP function from the Driller’s remote control panel (electric) on a surface BOP system. a.
The MASTER BUTTON must be depressed for 5 seconds and then released before a BOP function is depressed.
b.
The MASTER BUTTON must be held depressed while a BOP function button is depressed.
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c.
The BOP function button is depressed and then released. The MASTER BUTTON must then be depressed to activate the operation. 4 marks
40:
Which BOP functions are operated by manifold pressure? a. Ram preventers only. b. Hydraulically operated choke and kill line valves only. c. Rams and hydraulically operated choke and kill line valve only. d. Rams, annular preventer and hydraulically operated choke and kill line valves. 2 marks
41:
Given the data for a surface ram BOP. Nominal size: Maximum rated working pressure: Closing Ratio:
135/8” 15,000 psi 10.6 : 1
The Hydraulic Fluid required for this ram BOP:
165 gallons.
The data for an accumulator bottle is: Bottle capacity (Nitrogen & Fluid): Pre-charge pressure: Maximum operating pressure for BOP accumulator unit:
10 gallons. 1,000 psi. 3,000 psi.
Calculate the minimum number of accumulator bottles required on the accumulator bank to enable the closing of the ram on Rated Working Pressure. Answer
Bottles 5 marks
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