Wood Group Manual RP1164

Wood oo d Group Pressure ressur e Contro on troll

Wellhead Equipment Running Procedures for:

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Con ventional Wellhead Assemb ly Conv Assembly

Publication # RP-1164 September 26, 2007

RP-1164 Page 28

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Assembly Assembly

Wood Group Pressu Pressure re Cont Control rol

Tab le of Contents able Bill of Materials .............................. ............... ............................. ............................................ .............................. ............................. ............................ .............. ............. ............................... ............................... ........................... ............ 1 Stage 1 — 

Install the Casing Head Assembly Assembly .................................. 4

Stage 2 — 

Test BOP Stack .............................. ............... ............................. ............................................ .............................. ............................. ............................ .............. ............. ............................... ............................... ........................... ............ 6

Stage 3 — 

Run the 13-5/8" Wear Bushing ....................................... 7 Run the Wear Bushing Before Drilling ............................................................ 7 Retrieve the Wear Bushing After Drilling ...................................................... ......................................................... ... 7

Stage 4 — 

Hang Off the 13-3/8" Casing ............................. .............. ............................ ............................ .............. ............. .............................. ............... ........................... ............ 8

Stage 5 — 

Install the Casing Spool .............................. ............... ............................................. ............................... ................ ............................... ................ .............................. ................ 10 Flange Test ..................................................... ...................................................................................................... ................................................. 11

Stage 6 — 

Test the BOP Stack .............................. ............... ............................................. ............................... ..................... ...... ..... ............................... ................ ............................... .................... .... 12

Stage 7 — 

Run the Wear Bushing ............................. .............. ............................ .............................. ............................. ................... .................. .... ... .............................. ............... .............................. ................. .. 13 Run the Wear Bushing Before Drilling .......................................................... 13 Retrieve the Wear Bushing After Drilling ....................................................... 13

Stage 8 — 

Hang Off the 9-5/8" Casing ......................................... .............................. ......................................... ........... 14

Stage 9 — 

Install the Tubing Head .............................. ............... ............................................. ............................... ................ ............................... ................ .............................. ................ 16 Energize the P Seals .................................................. ........................................................................................ ...................................... 17 Test Between the Seals ........................................................ .................................................................................... ............................ 17 Flange Test ..................................................... ...................................................................................................... ................................................. 18

Stage 10 — 

Testing the BOP Stack ............................. .............. ............................ .............................. ............................. ................... .................. .... ... .............................. ............... .............................. ................. .. 19

Stage 11 — 

Run the Wear Bushing ............................. .............. ............................ .............................. ............................. ................... .................. .... ... .............................. ............... .............................. ................. .. 20 Run the Wear Bushing Before Drilling .......................................................... 20 Retrieve the Wear Bushing After Drilling ....................................................... 20

Stage 12 — 

Hang Off the 4-1/2" Tubing ......................................... .............................. ......................................... ........... 21 Landing the Tubing Hanger ................................................... ........................................................................... ........................ 22

Stage 13 — 

Install Production Tree .............................. ............... ............................................. ............................... ................ ............................... ................ .............................. ................ 23 Flange Test ..................................................... ...................................................................................................... ................................................. 24

Integral Lockscrew Operation ..................................... 25 Lockscrew Operation Instructions .................................................. .................................................................. ................ 25

Recommended Procedure for Field Welding Pipe to Wellhead Parts for Pressure Seal ................................. 26

Wood Group Pressu Pressure re Cont Control rol

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Convention al Wellhead Wellhead Assembly

RP-1164 Page 27

Bill of Materials

Wood Group Pressure Control

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 1

Bill of Ma ter ials Mater terials CASING HEAD ASSEMBLY Item Qty Qt y Description

Item Qt y Description

A1

1

Casing Head, WG, W2,20-3/4" 3M x 18-5/8" SOW, with two 2" line pipe outlets with o-ring, 6A-PU-AA-2-2 Part # 363832

A2

1

Ba sep late A ss embly, WG, S pl it Weldless, 36" O.D. x 21.6" I.D. top x 13.0" tall, 2000 KIP capacity Part # 363966

A3

1

Gate Valve, model 1000, 2-1/16" 3/5M, 2" line pipe, handwheel operated, AA trim, 6A-PU-AA -2-2 Part # 354016

A4

1

Nipple, 2" line pipe x 6" long, schedule 160, ANSI 4130 Part # NI6-API

A5

1

BullPlug, 2" line pipex blank,4"long, API 6A Part # BPS-API

A6

1

Bull Plug, 2" line pipe, tapped 1/2" NPT, 4" long, API 6A Part # BPT-API

A7

1

Needle Valve, 1/2" NPT male x female, angle Part # NVA

A8

1

Pressure Gauge, 0-5000 psi, 4-1/2" O.D. face, 1/2" NPT male, Part # PG5

A9

A10

A11

1

20

1

CASING SPOOL ASSEMBLY

Ring Gasket, RX-74, carbon steel plated, API 6A, PSL1-4 Part # RX74 Studs, with two nuts each, plated, 2" 8UNC x 14.75" long, stud A193-GR B7, nut A194-GR 2H Part # 327099

Page 2

Item Qt y Description

B1

1

Cas ing Spool, WG, W2-SGLEBS, 20-3/4" 3M x 13-5/8" 5M, with two 21/16" 5M studded outlets, 6A-PU-EENL-2-2 Part # 363834

C1

1

Tubi ng Head, WG, T-DBLEBS, 13-5/8" 5M x 11" 5M, with two 2-1/ 16" 5M studded outlets, 6A-PU-EENL-2-2 Part # 340991

B2

1

Gate Valve, model 2200T, 2-1/16" 3/ 5M, flanged end, handwheel operated, EE-0,5 trim, 6A-LU-EE-0,52-2 Part # 349273

C2

2

GateValve, model 2200T, 2-1/16"3/ 5M, flanged end, handwheel operated, EE-0,5 trim, 6A-LU-EE-0,52-2 Part # 349273

B3

2

Companion Flange, 2-1/16" 5M x 2" line pipe, 6A-U-EE-NL-2 Part # 323350

C3

2

CompanionFlange, 2-1/16" 5Mx 2" line pipe, 6A-U-EE-NL-2 Part # 323350

B4

1

Bull Plug, 2" line pipe x blank, 4" long, API 6A Part # BPS-API

C4

1

BullPlug, 2" line pipe xblank,4"long, API 6A Part # BPS-API

B5

1

Bull Plug, 2" line pipe, tapped 1/2" NPT, 4" long, API 6A Part # BPT-API

C5

1

Bull Plug, 2" line pipe, tapped 1/2" NPT, 4" long, API 6A Part # BPT-API

B6

3

Ring Gasket, RX-24, carbon steel, carbon steel plated, API 6A, PSL1-4 Part # RX24

C6

4

Ring Gasket, RX-24, carbon steel, carbon steel plated, API 6A, PSL1-4 Part # RX24

B7

8

Studs,withtwonuts each,plated,7/8" 9UNC x 6.50" long, stud A193-GR B7, nut A194-GR 2H Part # 800972

C7

16

Studs, with two nuts each, plated, 7/ 8" 9UNC x 6.50" long, stud A193GR B7, nut A194-GR 2H Part # 800972

B8

1

Needle Valve, 1/2" NPT male x female, angle Part # NVA

C8

1

Needle Valve, 1/2" NPT male x female, angle Part # NVA

B9

1

Pressure Gauge, 0-5000 psi, 4-1/2" O.D. face, 1/2" NPT male, Part # PG5

C9

1

Pressure Gauge, 0-5000 psi, 4-1/2" O.D. face, 1/2" NPT male, Part # PG5

Ring Gasket, BX-160, carbon steel, carbon steel plated, API 6A, PSL1-4 Part # BX160

C10

B10

1

B11 16

Studs, with two nuts each, plated, 1-5/ 8" 8UNC x 12.75" long, stud A193GR B7, nut A194-GR 2H Part # 801737

B12

Cas ing Hanger, WG, W2, 13-5/8" x 9-5/8", 6A-L-AA-4-2 Part # 341640

Casing Hanger, WG, W2, 20" x 133/8", 6A-L-AA-4-2 Part # 342495

RP-1164

TUBING HEADASSEMBLY

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

TubingHanger, WG, T-M56,11" x 4-1/2" (12.6#) New Vam bottom and top, with 4" H BPV thread, 6A-UAA-2-2 Part # 398801

Wood Group Pressure Control

RECOMMENDED SERVICE TOOLS Item Qty Qt y Description ST1

1

Test Plug/Retrieving Tool, SL, 20" nominal x 4-1/2" IF box x box Part # 336842

ST2

1

Wear Bushing, SL, 20" nominal x 17.62" ID x 11.8" long Part # 337442

ST3

1

Test Plug/Running and Retrieving Tool, SL, 13-5/8" nominal x 4-1/2" IF box top and bottom Part # 332044

ST4

1

Wear Bushing, SL, 13-5/8" nominal x 12-1/4" bit Part # 354660

ST5

1

Test Plug/Running and Retrieving Tool, SL, 11" nominal x 4-1/2" IF box top and bottom Part # 334030

ST6

1

Wear Bushing, SL, 11" nominal x 87/8" bit Part # 348213

ST7

1

Protector Cap, M56 Part # 313941

ST8

1

4" One-Way Type H Back Pressdure Valve Part # 350314

Wood Group Pressure Control

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 3

Stage 1 —  Install the Casing Head Assemb ly Assembly 1.

Run the conductor and 18-5/8" surface casing to the required depth and cement in place. Allow cement to set.

2.

Cut the conductor pipe off at the desired elevation above the cellar floor.

Note: Ensure the cut on the conductor is smooth and level. 3.

Cut the 18-5/8" casing at 16.50" above the conductor pipe stub and remove spent casing.

4.

Grind the 18-5/8" casing stub level and place a small bevel on the O.D. of the stub.

5.

Examine the  20-3/4" 3M x 18-5/8" SOW W2 Casing Head Assembly (Item A1). Verify the following: • seal areas, bore, ports, exposed ring groove are clean and undamaged • fittings, studs and nuts, and valves are intact and undamaged • ensure that the test o-ring is in place and in good condition

6.

Thoroughly clean the SOW pocket of the head removing all old grease and debris

7.

Align and level the Casing Head over the casing stub, orienting the outlets so they will be compatible with the drilling equipment.

8.

Remove the pipe plug from the port on the bottom of the head.

9.

Slowly and carefully lower the assembly over the casing stub and weld the Assembly to the 18-5/8" surface casing outside.

10. Test the weld as instructed and replace the pipe plug in the port on the bottom of the Head.

Tes t Med i a  Ac c ep tab l e Med i as Water Water S oluable Oil Inert Gas Nitrogen Argon Gas

U n ac c ep tab l e Med i as Oxygen Acetylene Hydraulic Oil Motor Oil Brack F luid

Note: The weld should be a fillet-type weld with legs no less than the wall thickness of the casing. Legs of 1/2" to 5/8" are adequate for most jobs. Refer to the back of this publication for the Recommended Procedure for Field Welding Pipe to Wellhead Parts for Pressure Seal  and for field testing of the weld connection. The following chart indicates acceptable and unacceptable test media.

RP-1164 Page 4

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 1 —  Install the Casing Head Assemb ly Assembly 11. Attach a suitable lifting devise to the top of the casing head and pull up on the head.  32" O.D. Split Weldless 12. Locate the 32"  Base Plate (Item A2) A2). Verify that: • assembly is clean and in good condition • all bolting is present 13. Remove the eight 1" studs and nuts from the baseplate gussets and separate the base plate in two halves. 14. Using the blocks, lift up on the casing head to ensure a gap of 13.00" exist between the conductor pipe stub and the bottom of the casing head. 15. Using the air hoist, carefully lower one half of the base plate into the cellar and place it on top of the conductor pipe and around the 18-5/8" surface casing. 16. Carefully lower the second half into the cellar and mate it to the first half and then set it down on the conductor. 17. Ensure all the bolt holes in the gussets aline and then install the eight 1" studs and nuts and tighten nuts securely. 18. Ensure the bolted gussets come face to face and then torque all nuts to approximately 200 ft-lbs. 19. Slack off all weight on the blocks and allow the casing head to rest on top of  the base plate.

Wood Group Pressure Control

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 5

Stage 2 —  Test BOP Stack 1.

Examine the  20" SL Test Plug/Retrieving Tool (Item ST1). Verify the following: • elastomer seals, lift lugs, and plugs are intact and in good condition • drill pipe threads are clean and in good condition

2.

Install a new Ring Gasket in the ring groove of the Casing Head and make up the BOP stack.

Immediately after making up the BOP stack  and periodically during the drilling of the hole for the next casing string, the BOP stack  (connections and rams) must be tested. 3.

Orient the Tool with elastomer down and lift lugs up. Make up a joint of drill pipe to the Tool.

WARNING WARNING:: Make sure the elastomer is down and the lift lugs are up up. 4.

Remove 1/2" NPT pipe plug if pressure is to be supplied through the drill pipe.

5.

Lubricate the elastomer seal of the Tool with a light oil or grease.

6.

Lower the Tool through the BOP and into the Casing Head until it lands on the load shoulder in the Casing Head, 8.52" below the top of the head.

7.

Close the BOP rams on the drill pipe and test to 3,000 psi. or as required by drilling supervisor.

8.

After a satisfactory test, release pressure, and open the rams.

9.

Remove as much fluid from the BOP stack as possible.

10. Retrieve the Tool slowly to avoid damage to the seal. 11. Repeat this procedure as required during the drilling of the hole.

RP-1164 Page 6

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 3 —  Run the 13-5/8" Wear Bushing Note: Always use a Wear Bushing while drilling to protect the load shoulders from damage by the drill bit or rotating drill pipe. The Wear Bushing must be retrieved prior to running the casing. 1.

Examine the  20" Nominal SL Wear   Bushing (Item ST2). Verify the internal bore is clean and in good condition.

Run the Wear Wear Bushing Before Drilling 2.

 20" SL Test Plug/RetrievOrient the 20" ing Tool (Item ST1) with the lift lugs down and the elastomer up.

WARNING WARNING:: Make sure the lift lugs are down and the elastomer is up when latching into the Wear Bushing. 3.

Attach the Tool to a joint of drill pipe.

4.

Align the retractable lift lugs of the tool with the retrieval holes of the bushing and the carefully lower the Tool into the Wear Bushing until the lugs snap into place.

Note: If the lugs did not align with the holes, rotate the tool in either direction until they snap into place. 5.

Apply a heavy coat of grease, not dope, to the OD of the bushing.

6.

Slowly lower the Tool/Bushing Assembly through the BOP stack and land it on the load shoulder of the casing head, 8.52" below the top of the head.

7.

8.

Remove the Tool from the Wear Bushing by rotating the drill pipe counter clockwise 1/4 turn and lifting straight up. Drill as required.

Retrieve the Wear Bushing After Drilling 9.

Make up the Tool to the drill pipe with the lift lugs down and the elastomer up.

10. Slowly lower the Tool into the Wear Bushing. 11. Pick up and balance the riser weight. 12. Rotate the Tool clockwise until a positive stop is felt. This indicates the lugs have snapped into the holes in the bushing. 13. Retrieve the Wear Bushing using the elevators if possible, and remove it and the Tool from the drill string.

Note: It is highly recommended to retrieve, clean, inspect, grease, and reset the wear bushing each time the hole is tripped during the drilling of the hole section.

Wood Group Pressure Control

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 7

Stage 4 —  Hang Off the 13-3/8" Casing 1.

Run the 13-3/8" casing string as required and cement in place.

2.

Drain the Casing Head bowl through the side outlet.

3.

Separate the BOP from the Casing Head and lift the BOP approximately 16" above the Casing Head and secure BOP with safety slings.

4.

Using a fresh water hose, thoroughly wash out the Casing Head bowl.

Note: Casing Head side outlet valve to remain open while setting the Casing Hanger. 5.

 20" x 13-3/8" W2 Slip Examine the 20" Casing Hanger (Item A11). Verify the following: • slips and internal bore are clean and in good condition • all screws are in place • packoff rubber is in good condition • set screws do not protrude inside slip teeth or outside slip body

Note: Ensure that the packoff rubber does not protrude beyond the O.D. of the Casing Hanger body. If it is, loosen slightly the cap screws in the bottom of the hanger using a 3/8” Allen wrench. 6.

There are two latch screws located in the top of the casing hanger. Using a 5/ 16” Allen wrench, remove the two latch screws located 180° apart and separate the hanger into two halves.

7.

Place two boards on the Casing Head flange against the casing to support the Hanger.

8.

Pick up one half of the hanger and place it around the casing and on top of the boards.

9.

Pick up the second hanger half and place it around the casing adjacent the first half.

10. Slide the two hanger halves together ensuring the slip alignment pins properly engage the opposing hanger half. 11. Reinstall the latch screws and tighten securely.

RP-1164 Page 8

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 4 —  Hang Off the 13-3/8" Casing 12. Prepare to lower the Hanger into the Casing Head bowl. 13. Grease the Casing Hanger's body. 14. Using a 5/16” Allen wrench, remove and discard the slip retaining cap screws. 15. Remove the boards and allow the hanger to slide into the Casing Head bowl. Note: The 20" x 13-3/8" W2 Slip Casing Hanger will require a minimum of 228,000 lbs. casing load to energize the seal. 16. When the Hanger is down, the top of  the hanger body will be flush or slightly below the top face of the Casing Head flange, pull tension on the casing to the desired hanging weight and then slack  off. Note: A sharp decrease on the weight indicator will signify that the Hanger has taken weight and at what point, If this does not occur, pull tension again and slack off once more. WARNING: Because of the potential fire hazard and the risk of loss of life and property, It is highly recommended to check the casing annulus and pipe bore for gas with an approved sensing device prior to cutting off  the casing. If gas is present, do not use an open flame torch to cut the casing. It will be necessary to use a air driven mechanical cutter which is spark free. 17. Rough cut the casing approximately 12" above the top flange and move the excess casing and BOP out of the way.

Wood Group Pressure Control

18. Final cut the casing at 4-3/4" above the top flange of the casing head. 19. Grind the casing stub level and then place a 3/16" x 3/8" bevel on the O.D. and a I.D. chamfer to match the minimum bore of the tubing head to be installed.

20. Thoroughly clean the top of the casing hanger and void area above the hanger. Ensure all cutting debris are removed .

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 9

Stage 5 —  Install the Casing Spool 1.

Examine the  20-3/4" 3M x 13-5/8" 5M  W2-SGLEBS Casing Spool (Item B1) . Verify the following: • ring grooves and bore are clean and undamaged • all peripheral equipment is intact and undamaged • EBS seal is properly installed and undamaged

2.

Clean the mating ring grooves of the Spool and Head.

3.

Install a new RX-74 Ring Gasket (Item  A9) in the ring groove of the Casing Head.

4.

Orient the Spool as required and carefully lower it over the casing stub and land it on the ring gasket.

5.

Make up the flange connection with the appropriate Studs and Nuts (Item A10), tightening them in an alternating cross pattern.

RP-1164 Page 10

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 5 —  Install the Casing Spool Flange Test 1.

Locate the unused FLG TEST fitting on the bottom flange of the Head and remove the dust cap.

2.

Attach a bleeder tool to the open SEAL TEST fittings and open the tool.

3.

Ensure the bleeder tool on the FLG TEST fitting is still open.

4.

Attach a test pump to the open FLG TEST fitting and pump clean test fluid into the flange connection until a continuous stream flows from the opposite bleeder tool.

5.

Close the FLG TEST bleeder tool and continue pumping test fluid to  3,000   psi or 80% of casing collapse —  whichever is less.

6.

Hold the test pressure for 15 minutes or as desired by the drilling supervisor.

7.

If pressure drops a leak has developed. Take the appropriate action from the adjacent chart.

8.

Repeat this procedure until a satisfactory test is achieved.

9.

Once a satisfactory test is achieved, remove the test pump and bleeder tools, drain test fluid, and reinstall the dust caps.

Wood Group Pressure Control

Leak Location

Ac tion

Into casing spool bore -EBS seal leak ing

Remove casing spool, replace leak ing seal, reinstall tree and retest

Between f langes- Ring gask et leak ing

Further tighten f lange connection

Casing annulus-Slip hanger seal element leak ing

Remove casing spool, spear pipe and reset slips with higher weight, reinstall casing spool and retest

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 11

Stage 6 —  Test the BOP Stack 1.

Examine the 13-5/8" SL Test Plug/   Retrieving Tool (Item ST3). Verify the following: • elastomer seals, lift lugs, and plugs are intact and in good condition • drill pipe threads are clean and in good condition

2.

Install a new Ring Gasket in the ring groove of the Casing Spool and make up the BOP stack.

Immediately after making up the BOP stack  and periodically during the drilling of the hole for the next casing string, the BOP stack  (connections and rams) must be tested. 3.

Orient the Tool with elastomer down and lift lugs up. Make up a joint of drill pipe to the Tool.

WARNING WARNING:: Make sure the elastomer is down and the lift lugs are up up. 4.

Remove 1/2" NPT pipe plug if pressure is to be supplied through the drill pipe.

5.

Lubricate the elastomer seal of the Tool with a light oil or grease.

6.

Lower the Tool through the BOP and into the Casing Spool until it lands on the load shoulder in the Casing Spool, 6.52" below the top of the spool.

7.

Close the BOP rams on the drill pipe and test to 5,000 psi. or as required by drilling supervisor.

8.

After a satisfactory test, release pressure, and open the rams.

9.

Remove as much fluid from the BOP stack as possible.

10. Retrieve the Tool slowly to avoid damage to the seal. 11. Repeat this procedure as required during the drilling of the hole.

RP-1164 Page 12

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 7 —  Run the Wear Bushing Note: Always use a Wear Bushing while drilling to protect the load shoulders from damage by the drill bit or rotating drill pipe. The Wear Bushing must be retrieved prior to running the casing. 1.

Examine the 13-5/8" Nominal SL Wear   Bushing (Item ST4). Verify the internal bore is clean and in good condition.

Run the Wear Wear Bushing Before Drilling 2.

Orient the 13-5/8" SL Test Plug/Retrieving Tool (Item ST3) with the lift lugs down and the elastomer up.

WARNING WARNING:: Make sure the lift lugs are down and the elastomer is up when latching into the Wear Bushing. 3.

Attach the Tool to a joint of drill pipe.

4.

Align the retractable lift lugs of the tool with the retrieval holes of the bushing and the carefully lower the Tool into the Wear Bushing until the lugs snap into place.

Note: If the lugs did not align with the holes, rotate the tool in either direction until they snap into place. 5.

Apply a heavy coat of grease, not dope, to the OD of the bushing.

6.

Slowly lower the Tool/Bushing Assembly through the BOP stack and land it on the load shoulder of the casing spool, 6.52" below the top of the spool.

7.

8.

Retrieve the Wear Bushing After Drilling 9.

Make up the Tool to the drill pipe with the lift lugs down and the elastomer up.

Remove the Tool from the Wear Bushing by rotating the drill pipe counter clockwise 1/4 turn and lifting straight up.

10. Slowly lower the Tool into the Wear Bushing.

Drill as required.

12. Rotate the Tool clockwise until a positive stop is felt. This indicates the lugs have snapped into the holes in the bushing.

Note: It is highly recommended to retrieve, clean, inspect, grease, and reset the wear bushing each time the hole is tripped during the drilling of the hole section.

Wood Group Pressure Control

11. Pick up and balance the riser weight.

13. Retrieve the Wear Bushing using the elevators if possible, and remove it and the Tool from the drill string.

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 13

Stage 8 —  Hang Off the 9-5/8" Casing 1.

Run the 9-5/8" casing string as required and cement in place.

2.

Drain the Casing Spool bowl through the side outlet.

3.

Separate the BOP from the Casing Spool and lift the BOP approximately 16" above the Casing Spool and secure BOP with safety slings.

4.

Using a fresh water hose, thoroughly wash out the Casing Spool bowl.

Note: Casing Spool side outlet valve to remain open while setting the Casing Hanger. 5.

Examine the 13-5/8" x 9-5/8" W2 Slip Casing Hanger (Item B12). Verify the following: • slips and internal bore are clean and in good condition • all screws are in place • packoff rubber is in good condition • set screws do not protrude inside slip teeth or outside slip body

Note: Ensure that the packoff rubber does not protrude beyond the O.D. of the Casing Hanger body. If it is, loosen slightly the cap screws in the bottom of the hanger using a 3/8” Allen wrench. 6.

There are two latch screws located in the top of the casing hanger. Using a 5/ 16” Allen wrench, remove the two latch screws located 180° apart and separate the hanger into two halves.

7.

Place two boards on the Casing Spool flange against the casing to support the Hanger.

8.

Pick up one half of the hanger and place it around the casing and on top of the boards.

9.

Pick up the second hanger half and place it around the casing adjacent the first half.

10. Slide the two hanger halves together ensuring the slip alignment pins properly engage the opposing hanger half. 11. Reinstall the latch screws and tighten securely.

RP-1164 Page 14

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 8 —  Hang Off the 9-5/8" Casing 12. Prepare to lower the Hanger into the Casing Spool bowl. 13. Grease the Casing Hanger's body. 14. Using a 5/16” Allen wrench, remove and discard the slip retaining cap screws. 15. Remove the boards and allow the hanger to slide into the Casing Spool bowl. Note: The 13-5/8" x 9-5/8" W2 Slip Casing Hanger will require a minimum of 72,000 lbs. casing load to energize the seal. 16. When the Hanger is down, the top of  the hanger body will be flush or slightly below the top face of the Casing Spool flange, pull tension on the casing to the desired hanging weight and then slack  off. Note: A sharp decrease on the weight indicator will signify that the Hanger has taken weight and at what point, If this does not occur, pull tension again and slack off once more. WARNING: Because of the potential fire hazard and the risk of loss of life and property, It is highly recommended to check the casing annulus and pipe bore for gas with an approved sensing device prior to cutting off  the casing. If gas is present, do not use an open flame torch to cut the casing. It will be necessary to use a air driven mechanical cutter which is spark free. 17. Rough cut the casing approximately 12" above the top flange and move the excess casing and BOP out of the way.

Wood Group Pressure Control

18. Final cut the casing at 4-3/4" above the top flange of the casing spool. 19. Grind the casing stub level and then place a 3/16" x 3/8" bevel on the O.D. and a I.D. chamfer to match the minimum bore of the tubing head to be installed. 20. Thoroughly clean the top of the casing hanger and void area above the hanger. Ensure all cutting debris are removed .

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 15

Stage 9 — 

Install the Tubing Head

1.

Examine the 13-5/8" 5M x 11" 5M T-DBLEBS  Tubing Head Assembly (Item C1). Verify the following: • 'EBS' Secondary Seals are in place and in good condition • all peripheral equipment is intact and undamaged

2.

Clean the mating ring grooves of the Casing Spool and the Tubing Head.

3.

Lightly lubricate the I.D. of the 9-5/8" EBS" seals and the casing stub with a light grease.

Note: Excessive grease may prevent a good seal from forming! 4.

Install a new BX-160 Ring Gasket (Item B10) in the ring groove of the Casing Spool.

5.

Orient the Tubing Head so the outlets are in the proper position and then carefully lower the head over the casing stub and land it on the ring gasket.

Warning: Do Not damage the "EBS" seals or there sealing ability will be impaired! 6.

Make up the flange connection with the appropriate size Studs and Nuts (Item B11), tightening them in an alternating cross pattern.

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Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 9 — 

Install the Tubing Head

Seal Test 1.

Locate the "SEAL TEST" fitting and one "FLG TEST" fitting on the Tubing Head lower flange and remove the dust cap from both fittings.

2.

Attach a Bleeder Tool to one of the open "FLG TEST" fitting and open the Tool.

3.

Attach a Hydraulic Test Pump to the other open fitting and pump clean test fluid between the EBS Seals until a test pressure 5,000 psi or 80% of Casing Collapse Pressure is Attained  whichever is less less.

5.

Hold the test pressure for fifteen (15) minutes or as desired by the drilling supervisor.

If pressure drops a leak has developed. Take the appropriate action in the table below.

7.

Repeat steps 1 - 6 until a satisfactory test is achieved.

4.

8.

When a satisfactory test is achieved, remove Test Pump, drain test fluid, and reinstall the dust cap on the open "SEAL TEST" fitting.

Flange Test 1.

Locate the remaining "FLG TEST" fittings on the Tubing Head lower flange and remove the dust cap from the fitting.

2.

Attach a Hydraulic Test Pump to the open fitting and pump clean test fluid into the void until a continuous stream flows from the Bleeder Tool.

3.

Close the bleeder tool and continue pumping test fluid until a test pressure equal the working pressure of the tubing head lower flange until a test pressure 5,000 psi or 80% of Casing Col- whichlapse Pressure is Attained ever is less less.

4.

Hold the test pressure for fifteen (15) minutes or as desired by the drilling supervisor.

5.

If pressure drops a leak has developed. Take the appropriate action in the adjacent table.

6.

7.

Leak Loc ation

Into tubing head bore - 'EBS' seals leak ing

Bleed of f  pressure, remove tubing head and replace leak ing 'EBS' seal

Between f langes - Ring gask et leak ing

Further tighten the f lange connection

Casing annulus - Casing hanger seal element leak ing

Bleed of f  pressure, remove tubing head, spear casing and reset slips with higher load, reistall tubing head and retest

Repeat steps 1 - 6 until a satisfactory test is achieved. When a satisfactory test is achieved, remove Test Pump, drain test fluid, and reinstall the dust caps on the open fittings.

Wood Group Pressure Control

Ac tion

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 17

Stage 10 —  Testing the BOP Stack — T Immediately after making up the BOP stack  and periodically during the conditioning of  the well for the completion, the BOP stack  (connections and rams) must be tested. 1.

Examine the 11" Nominal SL Test/   Plug Retrieving Tool(Item ST5). Verify the following: • elastomer seals, lift lugs, and plugs are intact and in good condition • drill pipe threads are clean and in good condition

2.

Install a new Ring Gasket in the ring groove of the Tubing Head and make up the BOP stack.

3.

Orient the Tool with elastomer down and lift lugs up. Make up a joint of drill pipe with the appropriate crossover to the Tool.

WARNING WARNING:: Make sure the elastomer is down and the lift lugs are up up. 4.

Remove 1/2" NPT pipe plug if pressure is to be supplied through the drill pipe.

5.

Lubricate the elastomer seal of the Tool with a light oil or grease.

6.

Retract all tubing head lockscrews and then carefully lower the Tool through the BOP until it lands on the load sho ulder in the Tubing Head, 10.0" below the top of the Tubing Head.

7.

Close the BOP rams on the pipe and test to 5,000 psi. or as required by drilling supervisor.

9.

Remove as much fluid from the BOP stack as possible.

10. Retrieve the Tool slowly to avoid damage to the seal. Note: Any leakage past the Tool will be monitored at the open side outlet valve. 8.

After a satisfactory test, release pressure, and open the rams.

Note: When performing the BOP blind ram test it is highly recommended to suspend a stand of drill pipe below the tool to ensure the tool stays in place while disconnecting from it with the drill pipe. 11. Repeat this procedure as required during the completion of the well.

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Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 11 —  Run the Wear Bushing — Run Note: Always use a Wear Bushing while drilling to protect the load shoulders from damage by the drill bit or rotating drill pipe. The Wear Bushing must be retrieved prior to running the casing. 1.

Examine the 11" Nominal SL Wear   Bushing (Item ST6) . Verify the internal bore is clean and in good condition.

Run the Wear Bushing Before Drilling Drilling 2.

Orient the 11" SL Test Plug/Retrieving Tool (Item ST5) with the lift lugs down and the elastomer up.

WARNING WARNING:: Make sure the lift lugs are down and the elastomer is up when latching into the Wear Bushing. 3.

Attach the Tool to a joint of drill pipe.

4.

Align the retractable lift lugs of the tool with the retrieval holes of the bushing and the carefully lower the Tool into the Wear Bushing until the lugs snap into place.

Note: If the lugs did not align with the holes, rotate the tool in either direction until they snap into place. 5.

Apply a heavy coat of grease, not dope, to the OD of the bushing and fully retract all tubing head lockscrews.

6.

Slowly lower the Tool/Bushing Assembly through the BOP stack and land it on the load shoulder of the tubing head, 10.0" below the top of the spool.

7.

8.

9.

Locate and run in two tubing head lockscrews 180° apart snug tight to retain the wear bushing.

Note: It is highly recommended to retrieve, clean, inspect, grease, and reset the wear bushing each time the hole is tripped during the drilling of the hole section.

Retrieve the Wear Bushing After Drilling

Remove the Tool from the Wear Bushing by rotating the drill pipe counter clockwise 1/4 turn and lifting straight up.

10. Make up the Tool to the drill pipe with the lift lugs down and the elastomer up.

Drill as required.

13. Rotate the Tool clockwise until a positive stop is felt. This indicates the lugs have snapped into the holes in the bushing.

11. Slowly lower the Tool into the Wear Bushing. 12. Pick up and balance the riser weight.

14. Retract all lockscrews and then retrieve the Wear Bushing using the elevators if  possible, and remove it and the Tool from the drill string.

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Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 19

Stage 12 —  Hang Off the 4-1/2" Tubing — Hang 1.

Run the 4-1/2" production tubing string to the required depth and space out appropriately.

2.

Examine the 11" Nominal x 4-1/2" New Vam, WG-T-M56  Tubing Hanger (Item C10) . Verify the following: • packoff rubber is intact and undamaged • bore and internal threads are clean and undamaged • tapered seal neck and o-ring are clean and undamaged

3.

Thoroughly clean and lightly lubricate the hanger seal neck and I.D. of the M56 Protector Cap (Item ST7) with oil or a light grease.

4.

Carefully slide the protector cap over the hanger neck, allowing the internal o-ring to retain the cap in place.

RP-1164 Page 20

5.

Make up a short handling joint in the top of the hanger and tighten securely

6.

At a predetermined position in the tubing string, set the tubing in the floor slips. Pick up the WG T-M56 Tubing Hanger and make it up in the tubing string. Torque the tubing hanger to the thread manufacturer's optimum make up torque.

7.

Pick up the tubing string so that the bottom of the hanger is approximately 5 feet above the rig floor and reset the floor slips.

8.

Remove the handling joint and install the appropriate length landing joint in the top of the hanger and torque the landing joint to the thread manufacturer's minimum make up torque.

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 12 —  Hang Off the 4-1/2" Tubing — Hang 9.

Calculate the distance from the top of the tubing head to the top of the rig floor and add 10.0". Record this dimension.

Landing the Tubing Hanger 10. Drain the BOP and riser through the tubing head side outlet valve. Retract all lockscrews, and then flush the tubing bowl with clean fresh water to remove any debris that may keep the hanger from properly landing. Note: Side outlet valve to remain open while landing the tubing hanger. 11. Thoroughly clean and lightly lubricate the hanger packoff rubber with oil or a light grease. 12. Pick up the tubing string and remove the floor slips. 13. Carefully lower the tubing hanger into the well, tallying the tubing every five feet to the recorded dimension. Place a paint mark on the landing joint at the proper elevation of the recorded dimension. 14. Continue lowering the tubing into the well and land the hanger on the load shoulder in the tubing head and slack off all weight. 15. Run in all the tubing head lockscrews in an alternating cross pattern to refusal. 16. After all wire line work is completed, remove the landing joint by rotating the joint to the left until it comes free of the hanger and then retrieve it with a straight lift. 17. Using a dry rod, install the 4" One-Way  Back Pressure Valve (Item ST8) in the tubing hanger bore. 18. With the back pressure valve set, nipple down the BOP.

Wood Group Pressure Control

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 21

Stage 13 —  Install Production Tree — Install 1.

Remove the Tubing Hanger Protector Cap with a straight vertical lift.

2.

Using a high pressure water hose, thoroughly clean the top of  the Tubing Head and the Tubing Hanger and blow dry with compressed air.

3.

Carefully inspect the neck of the hanger for any damage and repair as necessary. Replace the o-ring if necessary.

4.

Lightly lubricate the ring groove of the tubing head and the tapered neck seal area of the hanger with oil or a light grease.

5.

Place a new RX-54 Ring Gasket in the ring groove of the Tubing Head and fill the void above the hanger with clean test fluid.

6.

Examine the Single Production Tree with M56 Adapter  Flange . Verify the following: • internal bore and seal pocket are clean and in good condition • all valves, handwheels and actuators are in place and in good condition

7.

Lightly lubricate the Tree adapter flange seal pocket and ring groove with oil or a light grease.

8.

Align and level the Tree Assembly over the Tubing Head.

9.

Carefully lower the assembly over the Tubing Hanger neck and then land the assembly on the ring gasket.

10. Make up the flange connection using the adapter studs and  nuts, tightening them in an alternating cross pattern.

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Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Stage 13 —  Install Production Tree — Install Flange Test 1.

Locate the two "FLG TEST" fitting on the adapter flange and remove the dust cap from each fitting.

2.

Attach a bleeder tool to one of the open fittings and open the tool.

3.

Attach a Hydraulic Test Pump to the other open fitting and pump clean test fluid into the flange connection until a continuous stream flows from the Bleeder Tool.

4.

Close the Bleeder Tool and continue pumping test fluid until a stable pressure of 5,000 psi is attained

5.

Hold the test pressure for fifteen (15) minutes or as desired by the drilling supervisor.

6.

If pressure drops a leak has developed. Take the appropriate action in the adjacent table.

7.

Repeat steps 2 - 6 until a satisfactory test is achieved.

8.

When a satisfactory test is achieved, bleed off flange test pressure, remove Test Pump and Bleeder Tool, drain test fluid, and reinstall the dust cap on the open "FLG TEST" fittings.

Wood Group Pressure Control

Leak Location

Action

Between f langes - Ring gask et leak ing

Further tighten the f lange connection

Around Lock screws - Pack ing leak ing

Further tighten lock screw gland nuts

Into tubing annulus - Hanger seal element leak ing

Further tighten the lock screws

Into tree bore - Hanger neck  seal leak ing

Further tighten the f lange connection, retest, if  leak  continues, remove tree and replace neck  seal O-Ring and repair tappered hanger seal neck 

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 23

Integ ral Lockscrew Opera tion Integral Operation  Typical WGPC Integral Lockscrew Configuration Hold Backup on Glandnut Packing

Lockscrew

 Turn Lockscrew CounterClockwise to Retract

Retracted

Gland Nut  J unk Rings

No More than 3 Threads of Glandnut Exposed Past OD of Flange Hold Backup on Glandnut  Turn Lockscrew Clockwise to Engage Engaged

RP050425

Lockscrew Operation Instructions These instructions are applicable to ONLY WGPC "Integral" style lockscrews. This procedure does not cover lockscrews manufactured or installed in wellhead equipment not supplied by WGPC. 1.

The Integral Lockscrew is threaded into the Glandnut of the assembly with enough thread to back out clear of the bowl or to extend into the bowl. This will not disturb the seal/packing around the lockscrew shaft.

2.

The seal around the shaft is a compression type with metal Junk Rings. The Packing is energized with the Glandnut on the outside diameter of the flange and isolates the lockscrew threads from the well bore.

3.

The lockscrew is normally backed out of the bowl. The lockscrews are extended into the bowl only after a hanger has been installed. The lockscrew must be backed out prior to removing the hanger.

4.

To properly operate the lockscrew it is required to place a backup wrench on the gland nut, rotate the lockscrew in or out as required. In new installations the Glandnut torque is preset and should not be backe d off to operate the lockscrew. The Glandnut , when properly installed, should not expose more than 3 external threads past the OD of the wellhead.

5.

When replacing the lockscrew assembly, the junk rings and packing are to be placed in the lockscrew prep as indicated followed by the lockscrew/Gland nut assemb ly. The Gland nut is then torqued as requir ed. Once the Glandnut torque is met, th e Lockscrew may be operated as required.

Under no circumstances is the Glandnut to be backed off to operate the lockscrew. Always use the appropriate size box wrench or socket to rotate the Lockscrew. Do not use a pipe wrench. For lockscrew or lockscrew packing replacement instruction, refer to OM-044.

RP-1164 Page 24

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

Wood Group Pressure Control

Recommended Procedure for Field Welding Pipe to Wellhead P ar ts for Pressure Seal Par arts 1.

Introduction and Scope Scope.. The following recommended procedure has been prepared with particular regard to attaining pressure-tight weld when attaching casing heads, flanges, etc., to casing. Although most of the high strength casing used (such as N-80) is not normally considered field weldable, some success may be obtained by using the following or similar procedures.

3.

Welding Welding.. The welding should be done by the shielded metalarc or other approved process.

4.

Filler Metal Metal.. The root pass can be made either with an E6010 or E7018 electrode. E6010 electrodes offer good penetration and weld deposit ductility, but have a relatively high intrinsic hydrogen content. Low-hydrogen E7018 electrodes are less susceptible to hydrogen-induced root cracking. After the root pass, low hydrogen electrodes or filler wires of a yield strength equal to the casing yield strength should be used. The low hydrogen electrodes include classes EXX15, EXX16, EXX18, EXX28 of AWS A5.1 (latest edition): Mild Steel Covered ArcWelding Electrodes* and AWS A5.5 (latest edition): Low-Alloy Steel Covered Arc-Welding Electrodes*. Low hydrogen electrodes should not be exposed to the atmosphere until ready for use. Electrodes exposed to atmosphere should be dried 1 to 2 hours at 500 to 600°F (260 to 316°C) just before use.

5.

Preparation of Base Metal. The area to be welded should be dry and free of any paint, grease, scale, rust or dirt.

6.

Preheating Preheating.. Both the casing and the wellhead member sh ould be preheated to 200 to 300°F (93 to 149°C) for a distance of at least 3 inches (76.2 mm) on either side of the weld location, using a suitable preheating torch. Before applying preheat, the fluid should be bailed out of the casing to a point several inches (mm) below the weld location. The preheat temperature should be checked by the use of heat sensit ive crayons. Special attention must be given to preheating the thick sections of  wellhead parts to be welded, to insure uniform heating and expansion with respect to the relatively thin casing.

Caution: In some wellheads, the seal weld is also a structural weld and can be subjected to high tensile stresses. Consideration must therefore be given by competent authority to the mechanical properties of the weld and its heat affected zone. a. The steels used in wellhead parts and in casing are high strength steels that are susceptible to cracking when welded. It is imperative that the finished weld and adjacent metal be free from cracks. The heat from welding also affect s the mechanical properties. This is especially serious if the weld is subjected to service tension stresses.  b. This procedure is offered only as a recommendation. The responsibility for welding lies with the user and results are largely governed by the welder's skill. Weldabilit y of the several makes and grades of casing varies widely, thus placing added responsibility on the welder. Transporting a qualified welder to the job, rather than using a less-ski lled man who may be at hand, will, in most cases, prove economical. The responsible operating representative should ascertain the welder's qualifications and, if necessary, assure himself by instruction or demonstration, that the welder is able to perform the work satisfactorily. 2.

Welding Conditions. Unfavorable welding conditions must be avoided or minimized in every way possible, as even the most skilled welder cannot successfully weld steels that are susceptible to cracking under adverse working conditions, or when the work is rushed. Work above the welder on the drilling floor should be avoided> The weld should be protected from dripping mud, water, and oil and from wind, rain, or other adverse weather conditions. The drilling mud, water, or other fluids must be lowered in the casing and kept at a low level until the weld has properly cooled. It is the responsibility of the user to provide supervision that will assure favorable working conditions, adequate time, and the necessary cooperation of the rig personnel.

Wood Group Pressure Control

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Conventional Wellhead Wellhead Assembly

RP-1164 Page 25

Recommended Procedure for Field Welding Pipe to Wellhead P ar ts for Pressure Seal (continued) Par arts 7.

Welding Technique Technique.. Use a 1/8 or 5/32-inch (3.2 or 4.0 mm) E6010 or E7018 electrode and step weld the first bead (root pass); that, weld approximately 2 to 4 inches (50 to 100 mm) and then move diametrically opposite this point and weld 2 to 4 inches (50 to 100 mm) halfway between the first two welds, move diametrically opposite this weld, and so on until the first pass is completed. This second pass should be made with a 5/ 32-inch (4.0 mm) low hydrogen electrode of the proper strength and may be continuous. The balance of the welding groove may then be filled with continuous passes without back  stepping or lacing, using a 3/16-inch (4.8 mm) low hydrogen electrode. All beads should be stringer beads with good penetration. There should be no undercutting and weld shall be workmanlike in appearance. a. Test ports should be open when welding is performed to prevent pressure buildup within the test cavity.  b. During welding the temperature of the base metal on either side of the weld should be maintained at 200 to 300°F (93 to 149°C). c. Care should be taken to insure that the welding cable is properly grounded to the casing, but ground wire should not be welded to the casing or the wellhead. Ground wire should be firmly clamped to the casing, the wellhead, or fixed in position between pipe slips. Bad contact may cause sparking, with resultant hard spots beneath which incipient cracks may develop. The welding cable should not be grounded to the steel derrick, nor to the rotary-table base.

8.

Cleaning Cleaning.. All slag or flux remaining on any welding bead should be removed before laying the next bead. This also applies to the completed weld.

9.

Defects Defects.. Any cracks or blow holes that appear on any bead should be removed to sound metal by chipping or grinding before depositing the next bead.

10. Postheating. To prevent damage to packing a temperatur e of  275°F (135°C) to 300°F (149°C) for no less than one hour followed by a slow cool is a minimum requirement. 11. Cooling. Cooling. Rapid cooling must be avoided. To assure slow cooling, welds should be protected from extreme weather conditions (cold, rain, high winds, etc.) by the use of suitable insulating material. (Specially designed insulating blankets are available at many welding supply stores.) Particular attention should be given to maintaining uniform cooling of the thick  sections of the wellhead parts and the relatively thin casing, as the relatively thin casing will pull away from the head or hanger if allowed to cool more rapidly. The welds should cool in air to less than 200°F (93°C) (measured with a heat sensitive crayon) prior to permitting the mud to rise in the casing. 12. Test the Weld Weld.. After cooling, test the weld. The weld must be cool otherwise the test media will crack the weld. The test pressure should be no more than 80% of the casing collapse pressure. refer to the follow chart for approved testing media.

Tes t Med i a  Ac c ep t ab le Med ias Water Water S oluable Oil Inert Gas Nitrogen Argon Gas

RP-1164 Page 26

Repsol Exploration 18-5/8" x 13-3/8" x 9-5/8" x 4-1/2" 5M Conventional Wellhead Assembly Assembly

U n ac c ep tab le Med i as Oxygen Acetylene Hydraulic Oil Motor Oil Brack F luid

Wood Group Pressure Control