Tui Project: decommissioning the Tui oil field

[Audio: Soft tunes music plays]

[Visual: White video opening page with the New Zealand Government logo in the lower right corner, the Ministry of Business, Innovation and Employment logo in the lower left corner, and the video title ‘Decommissioning the Tui Oil Field’ in the centre of the page.]

[Visual: Wide 3D cross section rectangular cube in the centre of the page. Showing Mt Taranaki and a collection of small buildings on the right, transitioning leftward into the Taranaki coastline and out to sea where the ship, ‘FPSO Umuroa’ is floating offshore in the far left of the image. Sea surface is moving depicting waves.]

[Visual: ‘The Tui oil field, located 50 kilometres off the Taranaki cost’ written in lower left corner.]

[Visual: ‘Data supplied by the Ministry of Business, Innovation and Employment’ written along the lower edge of the screen.]

Narrator: The Tui Oil Field located 50 kilometres off the Taranaki coast, is a subsea development, featuring 8 wells and associated infrastructure on the sea floor.

[Visual: Tall 3D cross section rectangular cube in the centre of the page. Showing 2 large layers of water and 2 thin layers of seabed. The ship, ‘FPSO Umuroa’ is floating on the water surface in the centre with a small tugboat sitting alongside it to the left. ‘120 metres deep’ written at the left side of the cube with a measurement line. Sea surface is moving depicting waves.]

[Visual: ‘Connected to this infrastructure is an FPSO, called the Umuroa’ written in lower left corner.]

Narrator: Connected to this infrastructure is a floating production storage and offloading vessel, an FPSO called the Umuroa.

[Visual: Sea surface covers the screen, moving depicting waves. The Umuroa ship is floating on the water in the centre of the screen. The ship image is more detailed and shows flow lines and tanks covering its deck.]

Narrator: The Umuroa was used to process and store the oil extracted from the field.

[Visual: Image pans out, the Umuroa ship is smaller in the top centre of the screen and lines depicting the under-water flow lines are shown connecting the ship to 4 wells of the oil field via 4 mid-water arches. ‘Pateke 3H’ at top left, connected to ship via ‘Pat 3H MWA’. ‘Amokura 2H’ on the left, connected to ship via ‘AMO 2H MWA’. ‘Tui 3H’ at the bottom centre, connected to ship via ‘TUI 3H MWA’. ‘Tui 2H’ on the right, connected to ship via ‘TUI 2H MWA’.]

Narrator: Now that the Tui field has reached the end of its productive life, it is time to decommission the field. This will take place in 3 stages.

[Visual: White page with ‘Stage 1’ in the centre of the page.]

[Visual: Transitions back to previous image of the Umuroa ship connected to the 4 wells via under-water flow lines. Red colour moves along the flow lines to the Umuroa ship depicting where they are disconnected.]

Narrator: The first stage of decommissioning involves disconnecting the FPSO from the field infrastructure.

[Visual: Zooming in to a closer image of the detailed Umuroa ship and its under-water pipe connections to one of the MWAs. A smaller vessel is in front of the Umuroa. Cables from the smaller vessel disconnect the under-water flow lines from the Umuroa and lower them to the seabed, then disconnect the Umuroa from its mooring cables. The Umuroa sails off the left of the screen and the smaller vessel repositions to the centre of the screen.]

Narrator: The flow lines have been flushed, and in this stage, they will be disconnected and lowered to the sea floor along with the mooring system. Once disconnected from the field, the Umuroa will depart.

[Visual: White page with ‘Stage 2’ in the centre of the page.]

[Visual: Returning to the zoomed-out image of the oil field and its 4 wells. The smaller vessel is floating on the surface of the sea above the disconnected under-water flow lines to all 4 wells. Flow lines and MWAs now coloured red to depict them being removed.]

Narrator: The second stage of the process is the removal of the subsea infrastructure.

[Visual: Returning to the tall 3D cross section rectangular cube in the centre of the page with 2 layers of water and 2 layers of seabed, and the 120-meter measurement to the left side. The smaller vessel is floating on the water surface in the centre with a small tugboat sitting alongside it to the left. ‘Construction Support Vessel’ label to the side of the smaller vessel.]

[Visual: ‘A Construction Support Vessel will be used to lift the anchor chains…’ written in lower right corner.]

[Visual: Returning to the whole screen closer image of 1 well and its connection to the vessel via the MWA with the under-water flow lines. The construction support vessel is connected to the flow lines above the MWA point. The vessel floats from the right to the left over the top of the MWA removing the flow lines from resting on the MWA.]

Narrator: A Construction Support Vessel will be used to lift the anchor chains, flow lines and umbilicals to the surface and onto the vessel.

[Visual: Screen zooms in with the MWA in the centre and the vessel floating above it. A cable from the ship connects to the MWA and lifts it out of the water onto the deck of the vessel.]

Narrator: Risers and other parts of the subsea infrastructure will also be lifted to the surface.

[Visual: Further zoomed in the cable connects to another piece of equipment on the seabed and lifts that onto the deck of the construction support vessel. Zooms out, construction support vessel floats from the centre of the screen off screen to the right.]

Narrator: Once this stage is complete, the Construction Support Vessel will leave the field.

[Visual: White page with ‘Stage 3’ in the centre of the page.]

[Visual: Another small vessel floats on the surface in the centre of the screen with multiple small red cubes on the seabed where the under-water flow lines were previously positioned.]

Narrator: The third stage of the process is the plugging and abandoning of the wells.

[Visual: Returning to the tall 3D cross section rectangular cube in the centre of the page with 2 layers of water and 2 layers of seabed, and the 120-meter measurement to the left side. The new smaller vessel is floating on the water surface in the centre with a small tugboat sitting alongside it to the left. ‘Light Well Intervention Vessel’ label to the side of the smaller vessel.]

[Visual: ‘A Light Well Intervention Vessel or semi-submersible drilling rig will be used to decommission the wells.’ written in lower left corner.]

Narrator: A Light Well Intervention Vessel or semi-submersible drilling rig will be used to decommission the wells.

[Visual: Zooming in to the rear of the light well intervention vessel, an underwater vehicle is lowered off the side of the vessel into the water with cables from the top of the vessel.]

[Visual: Transitions to a close up of the underwater vehicle in the water and diving to the seabed arriving at a piece of equipment called a ‘subsea Christmas tree’. A pipe from the top of the screen lowers and connects to the top of the subsea Christmas tree.]

Narrator: A remotely operated underwater vehicle will inspect the subsea Christmas Tree, which is the equipment that controls the flow produced by the well.

[Visual: An image inserts over the right hand third of the screen showing a half cross section of the well underneath the subsea Christmas tree and shows 2 concrete plugs being inserted into the wellbore below the seabed.]

[Visual: Transitions to zoomed out image of the light well intervention vessel on the sea surface, connected to the subsea Christmas tree on the seabed by the riser pipe. The riser pipe retracts lifting the subsea Christmas tree to the surface and returning for the guide base sitting on the seabed.]

Narrator: To plug the wellbore, 2 cement plugs are inserted. The associated riser is then pulled to the surface and the Christmas Tree is removed.

[Visual: The Light Well Intervention Vessel with the subsea Christmas tree and the guide base on its deck moves off screen to the left. Once off screen 2 whales swim on screen under the water from the left and right, and off screen at the top and bottom.]

Narrator: The Light Well Intervention Vessel departs. Once the infrastructure is removed, the wells are considered plugged and abandoned, leaving the sea floor free from any equipment and restored to its natural state.

[Visual: White video closing page with the Ministry of Business, Innovation and Employment logo centre and the New Zealand Government logo underneath.]

[No narration. Video ends.]