DeepOcean has finished subsea construction and tie-in work at Teal West, connecting new output to the Central North Sea through infrastructure that is already in place rather than a new platform. The contractor did the work for operator Anasuria Operating Company, tying the upstream field back to the existing Anasuria floating production, storage and offloading (FPSO) facility on the UK Continental Shelf.

What DeepOcean installed

DeepOcean's scope covered the physical connection between the seabed well and the floating platform. The contractor installed a flexible production riser and flowline, plus an umbilical linking the Anasuria FPSO to the Teal West subsea Christmas tree, then protected the flowline and umbilical and commissioned the new infrastructure. A riser is the pipe that carries oil or gas from a subsea well up to a floating platform. A subsea Christmas tree is the valve assembly on the seabed that controls flow from the well.

Diverless connections

The work was done with a remotely operated vehicle (ROV) and specialized tooling instead of divers, which this kind of job has traditionally required. DeepOcean's own tie-in tool makes diverless connections on high-pressure flanges, letting subsea robotics connect pipes and valves that would otherwise need a dive crew.

"We're proud to have supported Anasuria in the successful delivery of the subsea scope," said Robin Mawhinney, DeepOcean's EVP EMEA, who said the project drew on the company's engineering and offshore execution work.

Field specs

  • Wells: two production wells and one water injection well
  • First tie-back: about three kilometers of subsea flowlines to the Anasuria FPSO
  • FPSO location: about 180 kilometers east of Aberdeen, in about 90 meters of water

Aberdeen-led, phased campaign

DeepOcean's Aberdeen office handled the engineering and project management for the subsea construction and tie-in work. Offshore, the campaign ran in two phases: subsea construction and tie-in first, then commissioning by a second offshore construction vessel from DeepOcean's chartered fleet.

Anasuria CEO Richard Beattie said DeepOcean has been "a trusted partner throughout the development," helping deliver a tie-back that uses existing infrastructure to support production and jobs from the UK North Sea.