Run and Test the Tree

-JHA- Perform JHA for running drill pipe while installing umbilical in moonpool, if deployed.

NOTE: Care must be taken during running the tree so as not to stop the tree in the splash zone to make up drill pipe connections.

(1) Move rig off location.

(2) Verify the tree valve status.

(3) Pick up TRT and the tree on drill pipe and remove the support from beneath the tree.

(4) Run TRT and tree in designated safe location. If an umbilical is to be deployed with the tree, clamp it to the drill string approximately every 50 ft.

(5) Make final ROV inspection of wellhead and tree.

(6) When the tree is within 50 feet of landing, move rig back onto location.

(7) Verify that the tree connector is in the unlocked position.

(8) Record hanging weight: WEIGHT:_____________________

(9) Set drill string compensator for 10,000 lb landing weight.

(10) Ensure that the running string is vented.

(11) Orient the tree to the desired heading. (i.e. orient the tree flowspool flange as required for jumper installation.)

(12) Slowly lower the tree on to the wellhead and slack off 10,000 lbs.

(13) Make final ROV inspection to verify the tree is fully landed to the wellhead.

(14) Slack off tree weight.

6.6.2 Lock Tree to Wellhead

Steps 1-5 apply to TRT on IWOCS. For ROV operated TRT, perform Steps 6-15.

IWOCS-Operated TRT (surface controlled):

(1) Bleed/vent gripper latch and block TRT latch (3,000 psi).

(2) LOCK the wellhead connector with 4,270 +100/-0 psi.

Note: Use the ROV to ensure that the tree connector is fully locked.

(3) Vent tree connector LOCK.

(4) Overpull 50,000 to 100,000 lbs. above hanging weight to test for lockdown.

(5) Release overpull.

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ROV-Operated TRT (subsea controlled):

(6) Remove the dummy ROV hot stab (if in place) from the receptacle on the TRT ROV panel and place it in the parking holder.

(7) Close the isolation valve (mounted on the panel) between the compensating system and the compensating system hot stab.

(8) Install a ROV hot stab with pressure test line into the receptacle.

(9) Vent the supply line (smaller diameter port on hot stab) and the return line (larger diameter port).

(10) VENT the Gripper Latch by turning the “GRP” valve to “V” position.

(11) Apply 4,270 +100/-0 psi to the supply line.

(12) LOCK the wellhead connector with the set pressure by turning the

“TREE” valve to “L” position.

Note: Use the ROV to ensure the tree connector is fully locked.

(13) Vent the supply line to vent the tree connector Lock function.

(14) Overpull 50,000 lbs. to 100,000 lbs. above hanging weight to test for lockdown.

(15) Release overpull.

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6.6.3 Test Tree/Wellhead Connection Test #10

(1) Open GT.

(2) Vent the running string.

(3) Connect the gasket test hot stab to the GT receptacle on the tree.

(4) Apply customer specified pressure up to 10,000 psi to GT (hot stab) for 10 minutes (minimum).

(5) Monitor connector for leakage using ROV. On the surface, observe for returns through the running string.

(6) Bleed pressure to zero psi.

(7) Close the GT valve.

Trouble shooting procedures (contingency)

a) Determine if gasket test hose/hot stab is leaking. Monitor for leakage from the hot stab receptacle. Close the GT valve and monitor for pressure drop.

b) Determine if wellhead gasket is leaking. Monitor for fluid leakage past tree connector, if ROV can access bottom of tree.

If wellhead gasket is leaking, retrieve tree, clean and inspect wellhead gasket prep, replace tree isolation sleeve seal, install appropriate wellhead gasket in tree, re-deploy tree, and retest.

c) Determine if tree isolation sleeve seal is leaking. Conduct reverse pressure test on tree isolation seal. This requires the test pressure on the gasket test port to be bled off, tree running tool to be locked onto the tree, the tree bore pressurized, and pressure outside the tree isolation sleeve to be monitored through the gasket test port. The test pressure will be limited by the pressure rating of the production casing string, storm packer, or cement plug in the well.

If the tree isolation sleeve seal is leaking, retrieve tree and change the isolation sleeve seal (primary or secondary), re-deploy tree, and retest.

GTV GT

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6.6.4 Subsea Tree Testing

Testing may begin after locking the tree to the wellhead, or later, after the TRT is recovered and the BOP has been run. The logistics of testing will depend on several factors such as the operator’s offshore testing philosophy, timing of other equipment installations and IWOCS system limitations.

If appropriate:

• Function test the tree valves and confirm functions.

• Test the tree control functions (i.e. high & low pressure supply, electrical, etc.)

• Perform the prescribed tree tests (tests #2 through #8)

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6.6.5 Retrieve TRT and Umbilical

Steps 1-13 apply to TRT on IWOCS. For ROV operated TRT, perform Steps 14-31.

IWOCS-Operated TRT Only:

ROV Requirements: Hot Stab placement

Flying lead removal & parking if required (1) Bleed all pressure from the lines in the umbilical.

(2) Remove the hot stab from the GT receptacle and stow on TRT.

(3) Stab dummy hot stabs in GT/GR ports.

(4) If appropriate, power down any IWOC electrical lines, disconnect Electrical Flying Leads and any Hydraulic Flying Leads. Place flying leads in the proper parking positions for TRT retrieval.

(5) With the grippers vented, function Tree Connector Unlock to retract the hydraulic cylinders. Observe the connector actuator ring to ensure the connector is not disturbed.

(6) Release the TRT from the tree by supplying 3,000 psi to the TRT

"UNLATCH" function.

(7) Lift the TRT off the tree at least 50 feet. ROV to observe stinger disengagement from the spool body during lift off.

-JHA- Perform JHA for retrieval of TRT and umbilical, if appropriate.

(8) Move the rig off location so that the TRT is not over the tree and retrieve the TRT.

-JHA- Perform JHA for breakout of TRT from drill pipe and movement of TRT.

(9) As the equipment is being retrieved, unclamp any umbilicals from the running string and spool it in.

(10) Land the stinger over the support frame and remove it from the TRT (see Drawing SD-030423-07).

(11) Remove the drill pipe adapter from the TRT and lift to the drill floor.

(12) Make up the lifting / test sub to the TRT. Pick up tool and set to side.

(13) Install debris cap on top of the spool body per customer requirements.

ROV-Operated TRT with CAMERON Panel Only:

(14) Vent the supply line (small diameter on hot stab) and the return line (large diameter on hot stab) on the ROV panel.

(15) Turn the “TRT” valve on the ROV panel from “L” to “U” position to UNLATCH the TRT.

(16) Apply 3,000 psi to the supply line (small diameter on hot stab) to UNLATCH the TRT latch mechanism.

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(17) Verify markings on two override rods that indicate the TRT is in UNLATCHED position.

(18) Lower pressure to 200 psi.

Note: Lowering the pressure is recommended because this pressure is being added to the hydrostatic which will be seen at the surface.

(19) Turn the “TRT” valve on the ROV panel to middle position to block pressure in.

(20) Bleed pressure and vent the supply line (small diameter on hot stab).

(21) VENT the Gripper Latch by turning the “GRP” valve on the ROV panel to “V” position.

(22) Turn the “TREE” valve on the ROV panel to “U” position to bleed pressure allowing the gripper assemblies to release the rods.

(23) Apply 3,000 psi on supply line (small diameter on hot stab) to move the gripper assemblies to UNLOCKED position. ROV to observe grippers disengagement from the tree rods.

(24) Lower the pressure to 1,500 psi.

Note: Lowering the pressure is recommended because this pressure is being added to the hydrostatic which will be seen at the surface.

(25) Turn the “TREE” valve on the ROV panel to middle position to block pressure in.

(26) Bleed pressure on supply line (small diameter on hot stab).

(27) Lift the TRT off the tree. Use ROV to observe disengagement from the Spool body during lift off.

(28) Move the rig off location so that the TRT is not over the tree.

(29) Retrieve the TRT.

(30) Land the stinger over the support frame and remove it from the TRT (see Drawing SD-030423-07).

(31) Remove the drill pipe adapter from the TRT and lift to the drill floor.

(32) Make up the lifting sub to the TRT.

Trouble shooting procedures (contingency Unlatch)

(1) Remove hot stab from the receptacle on the ROV panel.

(2) Place “GRP” valve in “V” position.

(3) Place both “TRT” and “TREE” valves in either “L” or “U” position.

(4) Using ROV cut the tubing (TRT Latch function) routed towards the perimeter on the right (“U”/”V”) side of the ROV panel.

NOTE: This step is done to release the pressure trapped by the pilot-operated check valve.

(5) Using proper lifting gear, pull up the two eyenuts on top of TRT. Verify unlatch marking on override rods.

(6) Retrieve TRT making sure that tool is unlatched.

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6.7 BOP Stack Installation