Tailwind files environmental statement for North Sea project

Oil and gas company Tailwind Energy has filed an environmental statement for its Evelyn development, located in the UK North Sea, to the UK authorities. A final investment decision for the project is expected to be made this year. 

Triton FPSO
Triton FPSO; Source: Tailwind

Tailwind is working towards committing to development of the Evelyn field located in the Central North Sea.

Ensuring that environmental matters have been fully considered for the Evelyn Development, before the full field development decision is taken, Tailwind has prepared an Environmental Statement presenting the findings of the Environmental Impact Assessment and has been submitted to the UK’S Secretary of State for Business, Energy and Industrial Strategy (BEIS), the company informed on Tuesday, March 10.

A public consultation on the plans is underway. Tailwind will make a final investment decision on the Evelyn field in 2020, conditional upon the approval of the Environmental Statement.


Tie-back to Triton FPSO


The first phase of development will consist of a single well, subsea tie-back to the Triton FPSO. The subsea tieback will include a new 10ʺ production line, 4ʺ gas lift line and umbilical for control services. The first oil is expected by the end of 2022.

There is also a possible phase 2 development consisting of a second well also covered by the field development plan. A decision whether to proceed with Phase 2 will be taken following review of the success of the first phase of production to decide if it is necessary to maximise hydrocarbon recovery. The development of a second well (EV2) will include the installation of a new 10ʺ pipeline, 4ʺ gas lift pipeline and umbilical between EV2 and the Evelyn valve skid (EVVS).

No significant topside processing system modifications are required to process the Evelyn fluids over the Triton FPSO. The tie-in point for Evelyn will be via the new Triton P1 riser, which is already being replaced as part of a Dana maintenance subsea scope during the major 2022 shutdown, and is outwith the scope of this ES.

The Evelyn development is located in the Triton cluster. Tailwind in September 2018 completed the purchase of Shell UK Limited, Shell EP Offshore Ventures Limited, and Esso Exploration and Production UK Limited interests in the Triton Cluster.

The Triton area consists of six producing oil fields developed via common infrastructure in the UK Central North Sea, located approximately 190km east of Aberdeen in water depths of 90m. The six fields currently producing oil and gas via the Triton FPSO, are Bittern, Guillemot West, Guillemot Northwest, Clapham, Pict and Saxon.

Dana Petroleum and Endeavour Energy are Tailwind’s partners in the Triton cluster. Dana currently operates the Triton FPSO along with the Clapham, Saxon, Pict and Guillemot West fields. Following the recent Tailwind transaction with Shell/Esso, Dana now also operates the Bittern field. Tailwind is operator of the Gannet E Field, with Dana as pipeline operator and Petrofac as well operator. Tailwind also operates the Belinda/Evelyn discoveries with Petrofac as well operator.

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