6. INSTALLATION AND OPERATING PROCEDURES
6.3 Tree Installation
NOTE: Landing Ring testing, Bore Protector Installation and Tree Running Tool Preparation may be done onshore before shipping the subsea tree offshore.
6.3.1 Required Equipment
A. Cameron Supplied Equipment
Description Part Number Qty.
B. Controls (Customer) Supplied Equipment
Description Part Number Qty.
IWOCS HPU
IWOCS Reel & Umbilical IWOCS Jumper
Test/Flushing Hydraulic J-Plate (B8H-66100) 1 Test HPU
Sensor Test Unit 4-1/2” IF Lift Cap C. General Test Equipment
Description
Sockets for Class 1-2 ROV Buckets (for Manual Valves)
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6.3.2 Prepare the Tree for Testing on the Rig Prior to Installation
Test the downhole function tree isolation valves and Tubing Hanger Landing Ring Seals in the spool body.
NOTE: Based on customer requirements, the Bore Protector may be installed in the spool body onshore which prevents flushing the lines offshore. The Landing Ring testing may be done onshore;
flushing and testing of the landing ring lines offshore is a
customer preference. If flushing is not necessary, omit this step.
It is Cameron’s recommendation that flushing is performed.
(1) Remove the tree bore protector if in place.
(2) Flush the downhole function lines through the subsea tree.
(3) Install the landing ring test stab into the seal pocket.
(4) Function the associated tree valve to the position given in the table below. Apply up to working pressure to the test stab. Vent the line at the junction plate.
Function Valve Position Pressure
SV1, SV2 CLOSED 10,000 psi
(5) Isolate, monitor and hold for 5 minutes.
(6) Bleed pressure to zero psi. Repeat pressure test.
(7) Repeat test for the remaining seal pockets.
6.3.3 Prepare Bore Protector Running Tool (BPRT) for BP Installation
NOTE: Based on customer requirements for flushing, the tree may be supplied with the bore protector already installed.
(1) Ensure that the four torque pins (See item 2 on Drawing SK-096284-01) are installed in the tool body.
(2) Make up a 4 1/2" IF lifting sub on top of the tool.
(3) Retract the spring loaded retrieving dogs on the tool by rotating the four cams to the “IN” position.
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6.3.4 Prepare Bore Protector (BP) for Installation
(1) Stand the bore protector upright.
(2) Remove two sets of shear pins (See drawing SK-126202-01): qty. 4 of item 6 (shear pin cartridges for lockdown) and qty. 6 of item 16 (anti-setting pins).
(3) Ensure free operation of spring loaded key if equipped.
(4) Ensure the bore protector is in the UNLOCKED position (lock ring flush to the OD of the body).
(5) Install spring loaded shear pin cartridges (item 6).
Note: Brass anti-setting shear pins (P/N 2155653-02) are used when the bore protector is installed subsea in place of item 16 (i.e. Teflon anti-setting pins). Each brass shear pin has a shear value of 11 kips.
NOTE: Ensure all pins are installed below flush.
(6) Inspect the o-rings (items 8 and 9) for damage.
(7) Install the BPRT and engage the J-slots by rotating the tool counter-clockwise. Verify that the detent balls snap in place.
6.3.5 Install Bore Protector in the Tree
NOTE: Based on customer requirements for flushing, the tree may be supplied with the bore protector already installed.
-JHA- Perform JHA for Bore Protector Installation
(1) Make sure that the Electrical Penetrator is retracted.
(2) Open SCM Valve on the tree and vent the line.
(3) Run and land Bore Protector in tree.
Note: If installing subsea, verify that the BOP rams and annular are fully open and verify the flex joint angle is less than 1 degree
(recommended).
(4) Watch for returns through the AMON/SCM line. This will indicate that the bore protector is within 2 inches of its fully landed position.
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(5) Slowly set off 5-10 kips (70 kips to set subsea with 6 brass shear pins) to weight set the bore protector lock ring. Observe the running tool drop approx. 1.6". Measure the distance from the top of the actuator sleeve of the BP to the top of the Spool Body (36.4 ± .2).
(6) Lockdown and seal integrity may be verified by applying 5,000 psi to the AMON/SCM line.
Steps 7-15 for subsea installation.
(7) Pick up (Overpull) approx 15,000 lbs (20,000 max) over the running tool (string) weight to verify the locking pins are engaged.
(8) Slack off overpull.
(9) Verify IMV and the downhole line tree valves are closed.
(10) Test the seals before the running tool is released by applying 5,000 psi to the AMON/SCM line and holding for 5 minutes.
(11) Rotate 15-20 degrees to the right (clockwise) to disengage the tool from the bore protector.
(12) Lift the tool out of the bore protector 1 to 2 feet.
(13) To verify lockdown and the tool disengaged without shearing the pins, apply 5000 psi to the AMON/SCM line. Hold for 5 minutes.
(14) Reduce pressure to zero.
(15) Retrieve the running tool.
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6.3.6 Prepare the TRT
The TRT may be deployed in two modes – surface controlled and subsea controlled. In surface controlled mode the IWOC umbilical is deployed and controls are from the surface. In subsea controlled mode, a ROV interface with TRT mounted Cameron control panel and activates TRT functions subsea. For subsea controlled mode, an additional ROV panel must be mounted and tested.
Both modes are included in this manual for completeness.
-JHA- Perform JHA for TRT movement, preparation, and lift sub/mandrel makeup.
(1) Inspect the TRT for damage.
(2) Flush and purge air from all five TRT functions.
(3) Ensure that pipe plugs (item 20 on SK-098341-02) are removed from the center bore (for access to the running string). Ensure that all other plugs are installed.
NOTE: The TRT through bore must be vented to prevent hydraulic lock when installing and removing from the spool tree subsea and to assist in filling the drill pipe.
(4) Remove the 4-1/2” IF mandrel if installed, and install the lift eye nut &
shackle. Bottom out the eye nut body, make up the coupling nut approx.
12 turns and tighten the set screws.
(5) If running TRT on IWOCS only (surface controlled mode): Set up and test the TRT umbilical reel as per Controls procedure. Connect the utility umbilical to the TRT manifold block as follows and go to 6.3.7:
FUNCTION MANIFOLD BLOCK
Tree Connector Lock Main Cylinder Extend Tree Connector Unlock Main Cylinder Retract
TRT Latch Latch
TRT Unlatch Unlatch
Gripper Latch Secondary Cylinder
(6) For the Cameron ROV panel:
a. Verify that the compensator is fully charged; purge as much air as possible. Set relief valve to 15 psi.
b. Verify a 1,250 psi pre-charge on the accumulator.
c. Verify the portion of latch tubing for emergency ROV cutting.
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6.3.7 Function Test of the TRT
(1) For subsea controlled mode with a Cameron ROV panel: Insert a hot stab with test line into TRT ROV panel hot stab receptacle.
(2) Test all five TRT functions by applying pressure through hot stab line and operating the valves on the ROV panel (See Running Tools Section).
(3) If running TRT with IWOCS only (surface controlled mode): Test all five TRT functions by applying pressure through the utility umbilical.
For either method of running (subsea or surface controlled mode), the functions should be smooth and repeatable. Verify visual markings on TRT components.
Function Pressure Notes
Latch (TRT to Tree) 3,000 psi Unlatch (TRT from Tree) 3,000 psi Secondary Cylinder
(Gripper Latch) 1,500 psi
(3,300 psi max)
1) Use regulated pressure supply or pressure intensification may result.
2) 1,500 psi maximum when tree rods are not in place.
Tree Connector Lock (extend ) 4,270 psi Tree Connector Unlock (retract) 4,270 psi
(4) Prepare the ROV hot stab for the AX/VX gasket test. Note that 10’ to 20’ of slack must be used to allow the ROV to remove the hot stab from the tree when the TRT is being retrieved.
---ACCUMULATOR
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6.3.8 Prepare the Tree Test Skid
(1) Ensure the test skid is assembled with the correct insert.
(2) Inspect and clean the stump gasket prep and seal surfaces of the dummy casing hanger insert.
(3) Connect a test hose with isolation valve to the bottom stump test port and plug the port on the O.D. of the stump.
(4) Fill the stump with fresh water.
6.3.9 Prepare the Tree
(1) Inspect and clean the Tree gasket prep and seal surfaces inside the Spool.
(2) Ensure the top of the Spool is clean and lightly oiled.
(3) Ensure the Bore Protector is installed.
(4) Check the wellhead gasket condition in the bottom of the tree. If the gasket is not installed, position the gasket on the test stump.
(5) Verify that the connector is unlocked and install the Tree Handling Tool on the top of the spool body. If the connector is locked, install the TRT, utilize the TRT to unlock the connector, install the tree on the test stump and skip section 6.3.10.
6.3.10 Install the Tree on the Stump and Fill Tree
-JHA- Perform JHA for tree movements and removal of the THT.
(1) Ensure the GT is open and GR and GT hot stabs are not installed.
(2) Inspect the tree connector and wellhead gasket and the isolation sleeve seal (lower or upper, where applicable).
(3) Pick up the tree and carefully lower it onto the tree test skid.
(4) Remove the Tree Handling Tool if installed.
(5) Fill the tree with fresh water. Open the tree valves during filling to ensure that the valve cavities fill up.
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6.3.11 Install the TRT on the Tree
-JHA- Perform JHA for TRT lift and movement to tree.
Steps 1-6 apply to IWOCS TRT (surface controlled). Steps 7-27 apply to ROV operated TRT (subsea controlled) only.
IWOCS-Operated TRT (surface controlled):
(1) VENT the Gripper Latch.
(2) Apply 3,000 psi to the supply line and RETRACT the tree connector cylinders. Note: Maximum operating pressure not required. Verify markings that indicate the cylinders are in the retracted position.
(3) UNLATCH the TRT latch mechanism. Verify markings on two override rods that indicate the TRT is in unlatched position.
(4) Pick up the TRT and orient it over the tree, aligning the grippers with the tree actuator rods.
(5) Slowly land the TRT on the Tree.
(6) LATCH the TRT to the Tree with 3,000 psi. Verify markings on the two TRT override rods that indicate the TRT is latched.
CAUTION: Maintain TRT LATCH pressure while handling tree.
ROV-Operated TRT with CAMERON Panel (subsea controlled mode):
(7) Remove the dummy ROV hot stab (if in place) from the receptacle on the TRT ROV panel and place it in the parking holder.
(8) Close the isolation valve (mounted on the panel) between the compensating system and the compensating system hot stab.
(9) Place all three valves on the ROV panel to middle position.
(10) Install a ROV hot stab with pressure test line into the receptacle.
(11) Vent the supply line (smaller diameter port on hot stab) and the return line (larger diameter port).
(12) VENT the Gripper Latch by turning the “GRP” valve to “V” position.
(13) Block the Gripper Latch function by turning the “GRP” valve to the middle position.
(14) Turn the “TREE” valve to “U” position and apply 3,000 psi to the supply line (small dia. port) to RETRACT the gripper assemblies.
(15) Verify markings that indicate the gripper assemblies are in retracted position.
(16) Place the “TREE” valve to middle position to block pressure in.
(17) Turn the “TRT” valve to “U” position to UNLATCH the TRT latch mechanism.
(18) Verify markings on two override rods that indicate the TRT is in unlatched position.
(19) Turn the “TRT” valve to middle position to block pressure in.
(20) Bleed pressure on supply line.
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(21) Pick up the TRT and orient it over the tree aligning the grippers with the tree actuator rods.
(22) Slowly land the TRT on the Tree.
(23) Apply 3,000 psi on supply line.
(24) Turn the “TRT” valve to “L” position to LATCH the TRT to the Tree.
(25) Verify markings on two override rods that indicate the TRT is latched.
(26) Turn the “TRT” valve to middle position to block pressure in.
CAUTION: Observe gauge on “TRT” “L” side to verify that the Latch pressure is maintained while handling the tree.
(27) Bleed pressure on supply line.
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6.3.12 Lock the Tree Connector Onto the Test Stump
Steps 1-3 apply to TRT on IWOCS. For ROV operated TRT, perform Steps 4-7 only.
IWOCS-Operated TRT (surface controlled):
(1) Ensure the Gripper latch is vented.
(2) LOCK the tree to the stump by supplying 4,270 +100/-0 psi to the TRT
“tree connector lock” function.
(3) Check the marks (connector’s actuator rods or tree brackets) to verify the tree connector is locked.
ROV-Operated TRT with CAMERON Panel (subsea controlled):
(4) Vent the Gripper Latch by turning the “GRP” valve to “V” position.
(5) Turn the “TREE” valve to “L” position.
(6) LOCK the tree to the stump by supplying 4,270 +100/-0 psi to the supply line.
(7) Check the marks (connector or actuator rods) to verify the Tree is locked.
6.3.13 Prepare the Tree for Testing
-JHA- Perform JHA for pressure testing of equipment.
(1) Ensure the tree is filled with fresh water.
(2) Ensure the TRT ‘Connector Lock’ pressure is vented.
(3) Flush all Tree circuits as directed by the Operator.
(4) Ensure that the Transfer Barrier fluid level is full.
(5) Install the IWOCS to the tree junction plate. Ensure all umbilical lines are vented.
(6) Function and test the control circuit of each actuator/valve
(independently) by applying 3,000 psi to the control circuit port and verify function by observing stroke of each actuator to the open position.
Bleed pressure to zero and verify function by observing stroke of the actuator to the closed position.
(7) During testing, observe IWOCS connection for leaks.
(8) Test continuity to the functions at the J-plates during testing. It is recommended that the IWOC line to free J-plate connection not be broken after testing to assure proper continuity of the tree functions.
(9) Test the pressure/temperature sensors.
(10) Close all tree valves.
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