The drilling program is finished, and selected producing wells will be completed to allow the gas or condensate to be transferred to the onshore or offshore processing facility.
The following operations and selected tools are typical of those encountered by an ROV team during this well completion phase.
If the well has been temporarily abandoned, an acid soak may be required to soften hard marine growth deposits prior to cleaning sealing surfaces.
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TMT Acid Plug is used to cap the well and inject a biological inhibitor via a hot stab and stinger.
Unlatch BOP Operation
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Remove AX, VX Gasket using the TMT AX/VX Gasket Installation & Removal Tool
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Clean the HPWH VX Seal Face Profile using the TMT AX/VX Profile Cleaning Tool
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Clean the internal H4 sealing area using the TMT Universal Wellhead Cleaner
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Clean the external H4 sealing area using the TMT Multi-Purpose Rotary Brushing Tool
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Install the new AX, VX gasket using the TMT AX/VX Gasket Installation & Removal Tool
Run Tubing Head Spool (THS)
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Hydraulically lock the THS to the wellhead using the TMT MK2 200 Fluid Transfer Skid
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Monitor and bleed off pressure using the TMT Hot Stab Deployment Panel
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Fit the trash cap using the TMT Low Profile Debris Cap
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Pressurise the VX gasket seal area using the TMT MK2 200 Fluid Transfer Skid
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Remove the TMT Low Profile Debris Cap and check/clean the THS HP Mandrel
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Install the new AX/VX gasket using the TMT AX/VX Gasket Installation & Removal Tool
Land BOP & Drill Ahead
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Operate the THS valves as directed using the TMT Electric Torque Tool
Pull BOP
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Evacuate around the THS pieces and couplers using the TMT Mini Dredger with the snorkel tube
Run Christmas Tree
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Assist in running using the Coda Echoscope 3D Sonar in poor visibility
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Xmas Tree may have linear valves locked open prior to running using the Lock Out Tool (LOT)
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Bleed off the valves, if required, using the TMT Manual Torque Tool
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Lock the Xmas Tree using the TMT MK2 200 Fluid Transfer Skid
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Bleed off pressure using the TMT Hot Stab Deployment Panel
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Remove hydraulic running tool using the TMT MK2 200 Fluid Transfer Skid
Final Completion Tasks
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Operate the valves as directed using the TMT Electric Torque Tool
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Remove the Lock Out Tool (LOT) using the Linear Actuated Override Tool (LAOT)
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Remove guide post extensions using the Buoyancy Ball 48kg
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Connect surface rigging subsea using the 5.4T Long Shank Hook
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Place all tools and debris found after the seabed survey in the 2.4m Subsea Swing Arm Basket
