Cameron Drilling Chokes

Drilling Choke

Operation and Maintenance Manual

TC1350

All the information contained in this manual is the exclusive propertyof Cooper Cameron Corporation, Cameron Willis Division. Anyreproduction or use of the calculations, drawings, photographs,procedures or instructions, either expressed or implied, is forbiddenwithout the written permission of Cooper Cameron Corporation,Cameron Willis Division, or its authorized agent.

Initial Release A1

October 1998

Copyright © 1998 all rights reservedby

Cooper Cameron CorporationCameron Willis Division

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PREFACE

The procedures included in this book are to be performed in conjunction with therequirements and recommendations outlined in API Specifications. Any repairs tothe equipment covered by this book should be done by an authorized CameronWillis service representative. Cameron Willis will not be responsible for loss orexpense resulting from any failure of equipment or any damage to any property orinjury or death to any person resulting in whole or in part from repairs performedby other than authorized Cameron Willis personnel. Such unauthorized repairsshall also serve to terminate any contractual or other warranty, if any, on theequipment and may also result in the equipment no longer meeting applicablerequirements.

File copies of this manual are being maintained. Revisions and/or additions will bemade when deemed necessary by Cameron Willis. Additional copies of thiscopyrighted material can be purchased from Cameron Willis.

The drawings in this manual are not scaled, but the dimensions shown areaccurate. SD numbers on drawings and photographs are for artwork identificationonly. Refer to component part numbers in all communications concerning thisequipment.

Direct any questions concerning the information in this manual to Cameron WillisEngineering. Direct requests for additional copies of this manual to the TechnicalPublications Department.

Cameron Willis10810 N.W. FreewayHouston, Texas 77092713-683-4600http:\www.coopercameron.com

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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)

5

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DRILLING CHOKE MAINTENANCE (T-069,9-98)

I. PREPARATION

Note: It is not necesssary to remove the choke from the manifold to perform theprocedures outlines below

A. Hydraulic Drilling Chokes

1. Close all valves necessary to isolate the choke being serviced from wellpressures.

2. Place a warning tag on each valve closed in step 1 above, to prevent theopening 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 isdisassembled.

B. Manual Drilling Chokes

1. Close all valves necessary to isolate the choke being serviced from wellpressures.

2. Place a warning tag on each valve closed in step 1 above, to prevent theopening of the valves while maintenance is in progress.

Warning: A serious accident may result if well pressure enters the choke while it isdisassembled.

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II. MAINTENANCE

Important: It is recommended that this maintenance be performed as soon aspractical after taking a kick.

A. Choke Body

1. Ensure that the choke is fully open.

2. Remove the actuator from the chokebody, using the appropriate actuatorwrench.

a. Use wrench P/N 40116 for hydraulicchokes.

b. Use wrench P/N 41535 for manualchokes.

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3. Inspect the following critical areas on the choke body:

a. The actuator O-ring sealing area in the choke body. The constantremoval of the actuator to change gates and seats makes this areasusceptible to wear. The bore diameter should be 4.125" (104.78mm).(Tolerance +.005"/-.000" [+.127mm/-.000mm]) If the bore is not withinthis tolerance, the body should be returned to Cameron Willis for repair.

b. The bore of the choke body which houses the seat. This area issusceptible to wear and corrosion. The bore diameter should be 4.000"(101.6mm). (Tolerance +.005"/-.000" [+.127mm/-.000mm]) If the bore isnot within this tolerance, the body should be returned to CameronWillis for repair.

B. Choke Actuator

1. Inspect the O-ring groove(s) on the actuator nose OD every time theactuator is removed from the choke body. Remove any nicks or burrs with afine emery cloth.

2. Install new O-ring(s) into the groove(s).

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(101.6 mm)

(104.78 mm)

SD-017234 b.

a.LC

4.00"

4.125"

3. Inspect the O-ring groove inside the actuator nose every time the gate isremoved. Refer to Paragraph C for the gate removal procedure. If anychrome plating in or around the groove has been eroded, the actuatorbody 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 bereplaced.

C. Gate

1. Inspect the gate.

a. Positive seal gates only: Any wearon the 45° chamfer prevents acarbide seal, thus eliminating thepositive sealing capability of thechoke. The choke may still be usedfor throttling; or the gate may bereversed, subject to the limitationsbelow.

b. If the gate is worn more than .750" (19.05mm) back from either sealingsurface, the gate must bereplaced.

c. If any part of the gate isworn completely through,the gate must bereplaced.

2. If the gate is not worn,proceed to Paragraph D.

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(50.55 mm)

SD-017235

45° 45°

1.99"

SurfaceSealing

SurfaceSealing

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.

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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, areinstalled 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 thepulling head.

b. Insert the tool, P/N 614445-03, intothe bore of the seat.

c. Ensure that the centering disc isfirmly seated in the bore.

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SD-017236

Spirol Pin

Hydraulic Ram

Hand Pump AdaptorCentering Disc

Yoke

Fingers

Pulling Head

d. Turn the spirol pin clockwise until it stops, extending the fingers andengaging 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 theadapter.

g. Activate the pump. The hydraulicram will pump the seat out of thebore.

h. Release the hydraulic pumppressure and remove the tool andseat from the choke body.

i. Turn the spirol pin counter-clockwise, retracting the fingersinto the pulling head.

2. Inspect the seat.

a. If a positive seal is required.

1) The seat must bereversed if there is anywear on the 45° angleon the ID of the seat.

2) The seat must berepaired or replaced ifthere is wear on both45° angles on the ID ofthe seat.

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(50.8 mm) (44.45 mm)

SD-017237

45°45°

2.00" 1.75"

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 backpressure 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 actuatorinto the choke bodyby turning itclockwise.

7. Tighten the actuator,using the appropriateactuator wrench.

a. Use wrench P/N40116 forhydraulic chokes.

b. Use wrench P/N41535 for manualchokes.

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III. Hydraulic Choke Troubleshooting

Important: Refer to Part I, Preparation, prior to disassembling the choke.

Problem Cause Solution

Choke will not open orclose.

1. Quick-connects areplugged.

a. Connect the CHOKEOPEN OIL and CHOKECLOSE OIL outlets at theconsole together, usingtwo male quick-connects.Attempt to circulatehydraulic fluid by movingthe manual chokecontrol lever either toOPEN or to CLOSE. Ifthere is no circulation,clean or replace thefemale quick-connects.

b. If there is circulation,connect the open andclose hydraulic lines atthe choke together,using two femalequick-connects. Attemptto circulate hydraulicfluid by moving themanual choke controllever either to OPEN orto CLOSE. If there is nocirculation, clean themale quick-connects orreplace the hydrauliclines.

c. If there is circulation,clean or replace thefemale quick-connects onthe choke actuator.

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Choke will not open orclose.

2. Actuator piston sealsare leaking (hydraulicpump in the consolekeeps pumping).

a. Disassemble the actuatorand inspect the cylinderbore. If the bore isscarred, replace theactuator.

b. If the bore is not scarred,replace all O-rings andreassemble the actuator.

Hydraulic fluid leakingaround the OD of theactuator cover.

O-ring on the OD of theactuator is leaking.

Clean the O-ring grooveand replace the O-ring.

Hydraulic fluid leakingaround the positionindicator box where it isbolted to the actuatorcover.

O-ring sealing theactuator rod and thecover is leaking.

Clean the O-ring grooveand replace the O-ring.

Hydraulic fluid leakingfrom the body bleedports.

O-ring sealing theactuator rod and theactuator is leaking.

Inspect the actuator rod. Ifthe rod is scarred, replaceit. Clean the O-ring grooveand replace the O-ring.

Well pressure leakingfrom the body bleedports (while attemptingto achieve a positive sealat operating pressure orwhile testing themanifold).

1. Actuator body OD sealis leaking.

Remove the actuator fromthe choke body. Clean theO-ring groove and replacethe O-ring. If leakingpersists, remove theactuator from the chokebody and inspect thesealing area in the chokebody. If the ID dimension isnot 4.125” (104.78mm)(Tolerance + .005”/-.000”[+.127mm/-.000mm]),replace the body.

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Well pressure leakingfrom the body bleedports (while attemptingto achieve a positive sealat operating pressure orwhile testing themanifold).

2. Actuator rod O-ringseal is leaking.

Remove the actuator rodfrom the actuator body. Ifthe actuator rod is scarred,it must be replaced. Cleanthe O-ring groove andreplace the O-ring.

Well pressure is leakingfrom the outlet, orpressure cannot bemaintained in the chokewhile it is installed in themanifold (whileattempting to achieve apositive seal at operatingpressure).

1. Gate and seat are notachieving a carbide-to-carbide seal.

a. Ensure that the hydraulicpump pressure in theconsole is set at 300 to325 psi (20.7 to 22.4Bars).

b. Refer to page 10 for gateand seat removal,inspection, andreplacement procedures.

2. O-ring in the ID of theactuator nose aroundthe OD of the gate isleaking.

Remove the actuator fromthe choke body. Clean theO-ring groove and replacethe O-ring.

3. O-ring around the ODof the seat is leaking.

a. Replace the O-ringsaround the OD of theseat. Refer to page 12 forseat removal procedure.

b. If leaking persists,inspect the bore in whichthe seat fits. There mustbe no scratches, and thebore diameter should be4.000” (101.6mm)(Tolerance +.005”/-.000”[+.127mm/-.000mm]).

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IV. Choke Specifications

Hydraulically Actuated Chokes

AssemblyNumber

Inlet FlangeSize and Pressure

Outlet FlangeSize and Pressure

DimensionsClearance

X Y

626209-01 3-1/8” API 5000 psi 3-1/18” API 5000 psi10.34”

(232.6mm)11.625”

(295.3mm)38”

(965.2mm)

626215-01 4-1/16” API 5000 psi 4-1/16” API 5000 psi10.34”

(232.6mm)11.625”

(295.3mm)38”

(965.2mm)

626211-01 3-1/16” API 10,000 psi 3-1/16” API 10,000 psi10.34”

(232.6mm)11.625”

(295.3mm)38”

(965.2mm)

626211-02 3-1/16” API 10,000 psi SST Lined 3-1/16” API 10,000 psi SST Lined10.34”

(232.6mm)11.625”

(295.3mm)38”

(965.2mm)

626219-01 4-1/16” API 10,000 psi 4-1/16” API 10,000 psi10.34”

(232.6mm)11.625”

(295.3mm)38”

(965.2mm)

626330-01 3-1/16” API 15,000 psi 3-1/16” API 15,000 psi10.34”

(232.6mm)11.625”

(295.3mm)39.5”

(1003.3mm)

626330-04 3-1/16” API 15,000 psi SST Lined 3-1/16” API 5000 psi SST Lined10.34”

(232.6mm)11.625”

(295.3mm)39.5”

(1003.3mm)

680773 3-1/16” CIW 20,000 psi Studded 1-13/16” API 20,000 psi Studded5.428”

(137.9mm)17.5”

(444.5mm)38”

(965.2mm)

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SD-017238

Y

X

To Remove ActuatorClearance Required

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Handwheel Operated Chokes

AssemblyNumber

Inlet FlangeSize and Pressure

Outlet FlangeSize and Pressure

DimensionsClearance

X Y

626208-01 3-1/8” API 5000 psi 3-1/18” API 5000 psi10.34”

(232.6mm)11.625”

(295.3mm)29.75”

(755.7mm)

626214-01 4-1/16” API 5000 psi 4-1/16” API 5000 psi10.34”

(232.6mm)11.625”

(295.3mm)29.75”

(755.7mm)

626210-01 3-1/16” API 10,000 psi 3-1/16” API 10,000 psi10.34”

(232.6mm)11.625”

(295.3mm)29.75”

(755.7mm)

626210-02 3-1/16” API 10,000 psi SST Lined 3-1/16” API 10,000 psi SST Lined10.34”

(232.6mm)11.625”

(295.3mm)29.75”

(755.7mm)

626457-01 4-1/16” API 10,000 psi 3-1/16” API 15,000 psi10.34”

(232.6mm)11.625”

(295.3mm)34.5”

(876.3mm)

626457-02 3-1/16” API 15,000 psi SST Lined 3-1/16” API 15,000 psi SSt Lined10.34”

(232.6mm)11.625”

(295.3mm)34.5”

(876.3mm)

41800 2-9/16” API 20,000 psi Studded 2-9/16” API 20,000 psi Studded6.25”

(158.8mm)13.50”

(342.9mm)34.5”

(876.3mm)

SD-017239

X

YTo Remove ActuatorClearance Required

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Spare Parts Kit: 10,000 psi WP Hydraulic Drilling ChokeP/N 49937-01Rev. 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


46 614387-02 1 Seat, 1-3/4” Diameter Orifice, Positive Seal

47 702640-34-24 4 O-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 ChokeP/N 626330-01-01Rev. B1


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



35 702640-22-64 1 O-Ring, Size 226



47 702640-34-24 2 O-Ring, Size 342


51 140173-01-02-03 1 U Packing

53 610108-08 1 Back-Up Ring


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Spare Parts Kit: 10,000 psi WP Manual Drilling ChokeP/N 626014-01Rev. A1


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



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




39 702640-34-24 4 O-Ring, Size 342



Spare Parts Kit: 15,000 psi WP Manual Drilling ChokeP/N 626014-02Rev. B2


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



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




39 702640-34-24 4 O-Ring, Size 342


42 140173-01-02-03 1 U Packing

43 12543-57 1 Retaining Ring


TC1350 25

Cameron Willis10810 N.W. FreewayHouston, TX 77092

713-354-1200

© Cooper Cameron Corporation, Cameron Willis Division, Printed in USA 10/98, OLY-MM, TC1350

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

Asia Pacific/Middle East

Cooper Cameron (Singapore) Pte. Ltd.

Number 2 Gul Circle, Jurong Industrial Est.

Locked Bag Service Number 3

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

Cameron Drilling Chokes

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