Drilling Choke
Operation and Maintenance Manual
All the information contained in this manual is the exclusive property of Cooper Cameron Corporation, Cameron Willis Division. Any
reproduction or use of the calculations, drawings, photographs, procedures or instructions, either expressed or implied, is forbidden without the written permission of Cooper Cameron Corporation, Cameron Willis Division, or its authorized agent.
Initial Release A1
October 1998
PREFACE
The procedures included in this book are to be performed in conjunction with the requirements and recommendations outlined in API Specifications. Any repairs to the equipment covered by this book should be done by an authorized Cameron Willis service representative. Cameron Willis will not be responsible for loss or expense resulting from any failure of equipment or any damage to any property or injury or death to any person resulting in whole or in part from repairs performed by other than authorized Cameron Willis personnel. Such unauthorized repairs shall also serve to terminate any contractual or other warranty, if any, on the equipment and may also result in the equipment no longer meeting applicable requirements.
File copies of this manual are being maintained. Revisions and/or additions will be made when deemed necessary by Cameron Willis. Additional copies of this
copyrighted material can be purchased from Cameron Willis.
The drawings in this manual are not scaled, but the dimensions shown are
accurate. SD numbers on drawings and photographs are for artwork identification only. Refer to component part numbers in all communications concerning this equipment.
Direct any questions concerning the information in this manual to Cameron Willis Engineering. Direct requests for additional copies of this manual to the Technical Publications Department. Cameron Willis 10810 N.W. Freeway Houston, Texas 77092 713-683-4600 http:\www.coopercameron.com
Contents
Drilling Choke Maintenance . . . 7
I. Preparation . . . 7
II. Maintenance . . . 8
III. Hydraulic Choke Troubleshooting . . . 15
IV. Choke Specifications . . . 18
10,000 psi WP Hydraulic Drilling Choke . . . 20
(Illustration and Parts List) 15,000 psi WP Hydraulic Drilling Choke . . . 21
(Illustration and Parts List) 10,000/15,000 psi WP Hydraulic Drilling Chokes. . . 22
(Spare Parts Lists) 10,000 psi WP Manual Drilling Choke . . . 23
(Illustration and Parts List) 15,000 psi WP Manual Drilling Choke . . . 24
(Illustration and Parts List) 10,000/15,000 psi WP Manual Drilling Chokes. . . 25 (Spare Parts Lists)
DRILLING CHOKE MAINTENANCE
(T-069,9-98)I. PREPARATION
Note: It is not necesssary to remove the choke from the manifold to perform the
procedures outlines below
A. Hydraulic Drilling Chokes
1. Close all valves necessary to isolate the choke being serviced from well
pressures.
2. Place a warning tag on each valve closed in step 1 above, to prevent the
opening of the valves while maintenance is in progress.
3. Place a warning tag on the hydraulic control for the choke being serviced,
to prevent its selection while maintenance is in progress.
Warning: A serious accident may result if pressure enters the choke while it is
disassembled.
B. Manual Drilling Chokes
1. Close all valves necessary to isolate the choke being serviced from well
pressures.
2. Place a warning tag on each valve closed in step 1 above, to prevent the
opening of the valves while maintenance is in progress.
Warning: A serious accident may result if well pressure enters the choke while it is
II. MAINTENANCE
Important: It is recommended that this maintenance be performed as soon as
practical after taking a kick.
A. Choke Body
1. Ensure that the choke is fully open. 2. Remove the actuator from the choke
body, using the appropriate actuator wrench.
a. Use wrench P/N 40116 for hydraulic chokes.
b. Use wrench P/N 41535 for manual chokes.
3. Inspect the following critical areas on the choke body:
a. The actuator O-ring sealing area in the choke body. The constant removal of the actuator to change gates and seats makes this area susceptible to wear. The bore diameter should be 4.125" (104.78mm). (Tolerance +.005"/-.000" [+.127mm/-.000mm]) If the bore is not within this tolerance, the body should be returned to Cameron Willis for repair. b. The bore of the choke body which houses the seat. This area is
susceptible to wear and corrosion. The bore diameter should be 4.000" (101.6mm). (Tolerance +.005"/-.000" [+.127mm/-.000mm]) If the bore is not within this tolerance, the body should be returned to Cameron Willis for repair.
B. Choke Actuator
1. Inspect the O-ring groove(s) on the actuator nose OD every time the
actuator is removed from the choke body. Remove any nicks or burrs with a fine emery cloth.
2. Install new O-ring(s) into the groove(s).
(101.6 mm) (104.78 mm) SD-017234 b. a. L C 4.00" 4.125"
3. Inspect the O-ring groove inside the actuator nose every time the gate is
removed. Refer to Paragraph C for the gate removal procedure. If any chrome plating in or around the groove has been eroded, the actuator body should be returned to Cameron Willis for repair.
4. Install a new O-ring into the groove.
5. Inspect the chrome plating on the actuator nose.
a. If any of the chrome plating has been eroded down to the base metal, the actuator body should be returned to Cameron Willis for repair. b. If any of the base metal has been eroded, the actuator body should be
replaced.
C. Gate
1. Inspect the gate.
a. Positive seal gates only: Any wear on the 45° chamfer prevents a carbide seal, thus eliminating the positive sealing capability of the choke. The choke may still be used for throttling; or the gate may be reversed, subject to the limitations below.
b. If the gate is worn more than .750" (19.05mm) back from either sealing surface, the gate must be
replaced.
c. If any part of the gate is worn completely through, the gate must be
replaced.
2. If the gate is not worn,
proceed to Paragraph D.
(50.55 mm)
45° 45°
1.99"
3. If the gate is worn, reverse the gate as follows:
a. Remove the retaining nut from the center of the gate.
b. Clamp the gate pulling tool, P/N 706610, around the gate. c. Knock the gate out, using a hammer and screwdriver. d. Remove the gate pulling tool from the gate.
e. Reverse the gate, and install it into the actuator by pushing it into place. Ensure that the two lockwashers, and the front and rear retainers, are installed in the correct sequence.
Important: If the gate is worn on both ends, replace the gate.
f. Install the retaining nut, securing the gate.
D. Seat and Wear Sleeve
1. Remove the seat.
a. Turn the spirol pin counterclockwise, retracting the fingers into the pulling head.
b. Insert the tool, P/N 614445-03, into the bore of the seat.
c. Ensure that the centering disc is firmly seated in the bore.
SD-017236
Spirol Pin
Hydraulic Ram Hand Pump Adaptor
Centering Disc Yoke
Fingers Pulling Head
d. Turn the spirol pin clockwise until it stops, extending the fingers and engaging the seat.
e. Thread the hydraulic ram firmly against the yoke.
f. Connect a 20,000 psi (1380 Bars) hydraulic hand pump to the tool at the adapter.
g. Activate the pump. The hydraulic ram will pump the seat out of the bore.
h. Release the hydraulic pump
pressure and remove the tool and seat from the choke body.
i. Turn the spirol pin counter-clockwise, retracting the fingers into the pulling head.
2. Inspect the seat.
a. If a positive seal is required. 1) The seat must be
reversed if there is any wear on the 45° angle on the ID of the seat. 2) The seat must be
repaired or replaced if there is wear on both
(50.8 mm) (44.45 mm)
45° 45°
b. If the seat is to be used for throttling only:
1) Moderate wear on the 45° angles on the ID of the seat is acceptable. 2) The seat must be replaced if it is worn through the entire 1.750"
diameter.
c The seat may be used as a flow restrictor, providing adequate back pressure can be maintained, and no positive seal is required.
3. Inspect the wear sleeve. Replace the wear sleeve if:
a. It is worn through to the choke body. b. It is cracked or broken.
c. Any part of it is missing.
4. Insert the seat into the bore of the choke.
5. Hammer the seat into position, using a wooden 2 x 4. 6. Install the actuator
into the choke body by turning it
clockwise.
7. Tighten the actuator,
using the appropriate actuator wrench. a. Use wrench P/N 40116 for hydraulic chokes. b. Use wrench P/N 41535 for manual chokes.
III. Hydraulic Choke Troubleshooting
Important: Refer to Part I, Preparation, prior to disassembling the choke.
Problem Cause Solution
Choke will not open or
close. 1. Quick-connects areplugged. a. Connect the CHOKEOPEN OIL and CHOKE CLOSE OIL outlets at the console together, using two male quick-connects. Attempt to circulate hydraulic fluid by moving the manual choke
control lever either to OPEN or to CLOSE. If there is no circulation, clean or replace the female quick-connects. b. If there is circulation,
connect the open and close hydraulic lines at the choke together, using two female
quick-connects. Attempt to circulate hydraulic fluid by moving the manual choke control lever either to OPEN or to CLOSE. If there is no circulation, clean the male quick-connects or replace the hydraulic lines.
c. If there is circulation, clean or replace the female quick-connects on the choke actuator.
Problem Cause Solution Choke will not open or
close. 2. Actuator piston sealsare leaking (hydraulic pump in the console keeps pumping).
a. Disassemble the actuator and inspect the cylinder bore. If the bore is scarred, replace the actuator.
b. If the bore is not scarred, replace all O-rings and reassemble the actuator. Hydraulic fluid leaking
around the OD of the actuator cover.
O-ring on the OD of the
actuator is leaking. Clean the O-ring grooveand replace the O-ring.
Hydraulic fluid leaking around the position indicator box where it is bolted to the actuator cover.
O-ring sealing the actuator rod and the cover is leaking.
Clean the O-ring groove and replace the O-ring.
Hydraulic fluid leaking from the body bleed ports.
O-ring sealing the actuator rod and the actuator is leaking.
Inspect the actuator rod. If the rod is scarred, replace it. Clean the O-ring groove and replace the O-ring. Well pressure leaking
from the body bleed ports (while attempting to achieve a positive seal at operating pressure or while testing the
manifold).
1. Actuator body OD seal
is leaking. Remove the actuator fromthe choke body. Clean the O-ring groove and replace the O-ring. If leaking persists, remove the actuator from the choke body and inspect the sealing area in the choke body. If the ID dimension is not 4.125” (104.78mm) (Tolerance + .005”/-.000” [+.127mm/-.000mm]),
Problem Cause Solution Well pressure leaking
from the body bleed ports (while attempting to achieve a positive seal at operating pressure or while testing the
manifold).
2. Actuator rod O-ring
seal is leaking. Remove the actuator rodfrom the actuator body. If the actuator rod is scarred, it must be replaced. Clean the O-ring groove and replace the O-ring.
Well pressure is leaking from the outlet, or pressure cannot be maintained in the choke while it is installed in the manifold (while
attempting to achieve a positive seal at operating pressure).
1. Gate and seat are not achieving a carbide-to-carbide seal.
a. Ensure that the hydraulic pump pressure in the console is set at 300 to 325 psi (20.7 to 22.4 Bars).
b. Refer to page 10 for gate and seat removal,
inspection, and
replacement procedures. 2. O-ring in the ID of the
actuator nose around the OD of the gate is leaking.
Remove the actuator from the choke body. Clean the O-ring groove and replace the O-ring.
3. O-ring around the OD
of the seat is leaking. a. Replace the O-ringsaround the OD of the seat. Refer to page 12 for seat removal procedure. b. If leaking persists,
inspect the bore in which the seat fits. There must be no scratches, and the bore diameter should be 4.000” (101.6mm)
(Tolerance +.005”/-.000” [+.127mm/-.000mm]).
IV. Choke Specifications
Hydraulically Actuated Chokes
Assembly
Number Size and PressureInlet Flange Size and PressureOutlet Flange
Dimensions
Clearance
X Y
626209-01 3-1/8” API 5000 psi 3-1/18” API 5000 psi (232.6mm)10.34” (295.3mm)11.625” (965.2mm)38” 626215-01 4-1/16” API 5000 psi 4-1/16” API 5000 psi (232.6mm)10.34” (295.3mm)11.625” (965.2mm)38” 626211-01 3-1/16” API 10,000 psi 3-1/16” API 10,000 psi (232.6mm)10.34” (295.3mm)11.625” (965.2mm)38” 626211-02 3-1/16” API 10,000 psi SST Lined 3-1/16” API 10,000 psi SST Lined (232.6mm)10.34” (295.3mm)11.625” (965.2mm)38” 626219-01 4-1/16” API 10,000 psi 4-1/16” API 10,000 psi (232.6mm)10.34” (295.3mm)11.625” (965.2mm)38” 626330-01 3-1/16” API 15,000 psi 3-1/16” API 15,000 psi 10.34” 11.625” 39.5”
SD-017238
Y
X To Remove Actuator
Handwheel Operated Chokes
Assembly
Number Size and PressureInlet Flange Size and PressureOutlet Flange
Dimensions
Clearance
X Y
626208-01 3-1/8” API 5000 psi 3-1/18” API 5000 psi (232.6mm)10.34” (295.3mm)11.625” (755.7mm)29.75” 626214-01 4-1/16” API 5000 psi 4-1/16” API 5000 psi (232.6mm)10.34” (295.3mm)11.625” (755.7mm)29.75” 626210-01 3-1/16” API 10,000 psi 3-1/16” API 10,000 psi (232.6mm)10.34” (295.3mm)11.625” (755.7mm)29.75” 626210-02 3-1/16” API 10,000 psi SST Lined 3-1/16” API 10,000 psi SST Lined (232.6mm)10.34” (295.3mm)11.625” (755.7mm)29.75” 626457-01 4-1/16” API 10,000 psi 3-1/16” API 15,000 psi (232.6mm)10.34” (295.3mm)11.625” (876.3mm)34.5” 626457-02 3-1/16” API 15,000 psi SST Lined 3-1/16” API 15,000 psi SSt Lined (232.6mm)10.34” (295.3mm)11.625” (876.3mm)34.5” 41800 2-9/16” API 20,000 psi Studded 2-9/16” API 20,000 psi Studded (158.8mm)6.25” (342.9mm)13.50” (876.3mm)34.5”
SD-017239
X Y
To Remove Actuator Clearance Required
Spare Parts Kit: 10,000 psi WP Hydraulic Drilling Choke
P/N 49937-01 Rev. D7
Item Part Number Qty Description
3 614415-01 1 Gate, 2” Diameter 9 702640-11-44 4 O-Ring, Size 114 10 702640-21-84 4 O-Ring, Size 218 11 702640-24-14 2 O-Ring, Size 241 12 31423-35-96-95 4 O-Ring 31 40853 1 Retainer Cap 32 614750-01 2 Lockwasher
34 705926 2 Back-Up Ring, Size 241 35 702640-22-64 2 O-Ring, Size 226 44 705925 2 Back-Up Ring, Size 226
46 614387-02 1 Seat, 1-3/4” Diameter Orifice, Positive Seal 47 702640-34-24 4 O-Ring, Size 342
49 705923 4 Back-Up Ring, Size 342
41819-01 1 Position Indicator Replacement 667172-01-65 4 Washer, Hansen
702640-11-11 4 O-Ring, Size 111 667172-01-66 4 Washer, Seal-Quick
Note: Item numbers correspond to callouts on the exploded view illustration on page 20.
Spare Parts Kit: 15,000 psi WP Hydraulic Drilling Choke
P/N 626330-01-01 Rev. B1
Item Part Number Qty Description
3 614415-01 1 Gate, 2” Diameter 9 702640-11-44 2 O-Ring, Size 114 10 702640-21-44 2 O-Ring, Size 214 11 702640-24-14 2 O-Ring, Size 241 12 31423-35-96-90 2 O-Ring 32 614750-01 2 Lockwasher
34 705926 2 Back-Up Ring, Size 241 35 702640-22-64 1 O-Ring, Size 226 44 705925 1 Back-Up Ring, Size 226
46 614387-02 1 Seat, 1-3/4” Diameter Orifice, Positive Seal 47 702640-34-24 2 O-Ring, Size 342
49 705923 2 Back-Up Ring, Size 342 51 140173-01-02-03 1 U Packing
Spare Parts Kit: 10,000 psi WP Manual Drilling Choke
P/N 626014-01 Rev. A1
Item Part Number Qty Description
5 705580-13 4 O-Ring, Size 010 9 705580-15 4 O-Ring, Size 218 11 705580-07 2 O-Ring, Size 226 12 614415-01 1 Gate, 2” Diameter 13 40853 1 Retainer Cap 14 614750-01 2 Lockwasher 16 705580-11 2 O-Ring, Size 241 18 705580-09 2 O-Ring, Size 233 22 705580-04 2 O-Ring, Size 215 26 705580-01 2 O-Ring, Size 012 28 705580-10 2 O-Ring, Size 236 33 705925 2 Back-Up Ring, Size 226 34 705926 2 Back-Up Ring, Size 241
36 614387-02 1 Seat, 1-3/4” Diameter Orifice, Positive Seal 39 702640-34-24 4 O-Ring, Size 342
40 705923 4 Back-Up Ring, Size 342
Note: Item numbers correspond to callouts on the exploded view illustration on page 23.
Spare Parts Kit: 15,000 psi WP Manual Drilling Choke
P/N 626014-02 Rev. B2
Item Part Number Qty Description
5 702640-01-04 4 O-Ring, Size 010 9 702640-21-44 2 O-Ring, Size 214 11 702640-22-64 2 O-Ring, Size 226 12 614415-01 1 Gate, 2” Diameter 13 40853 1 Retainer Cap 14 614750-01 2 Lockwasher 16 702640-24-14 4 O-Ring, Size 241 18 702640-23-34 2 O-Ring, Size 233 22 702640-21-54 2 O-Ring, Size 215 26 702640-01-24 2 O-Ring, Size 012 28 702640-23-64 2 O-Ring, Size 236 33 705925 2 Back-Up Ring, Size 226 34 705926 4 Back-Up Ring, Size 241
36 614387-02 1 Seat, 1-3/4” Diameter Orifice, Positive Seal 39 702640-34-24 4 O-Ring, Size 342
40 705923 4 Back-Up Ring, Size 342 42 140173-01-02-03 1 U Packing
Cameron Willis 10810 N.W. Freeway Houston, TX 77092 713-354-1200 Cameron Willis 10810 N.W. Freeway Houston, Texas 77092 Tel 713.354.1200 Fax 713.354.1291 www. camerondiv.com Cameron Willis Aghafad, Longford Republic Of Ireland Tel 011 353 43 50600 Fax 011 353 43 41560 www. camerondiv.com Cameron Willis 5003 93rd Street
Edmonton, Alberta T6E 5S9 Tel 403 434 3476
Fax 403 437 7397 www. camerondiv.com Eastern Hemisphere
Cooper Cameron (U.K.) Ltd. 5 Mondial Way
Harlington Hayes UB3 5AR Tel 44 208 9901800 Fax 44 208 9901888 www. camerondiv.com
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Jurong Town Post Office Singapore 629560 Republic Of Sinapore Tel 65 8613355 Fax 65 8616197 www. camerondiv.com Western Hemisphere Cameron P.O. Box 1212 Tel 713.939.2211 Fax 713.939.2620 www. camerondiv.com