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FPSO Offloading System for Western Isles Development Project

February 9th, 2015

Western Isles Development Project (WIDP) – Contract has been awarded to Techflow Marine for provision of an offloading system to operate on a SEVAN design cylindrical FPSO with extended offloading envelope.

Project completion expected 2nd Quarter 2015

The Dana Petroleum operated Western Isles Project will develop two discovered oil fields called Harris and Barra in the Northern North Sea, 160km east of the Shetlands and 12km west of Tern field. The oil fields are situated in a water depth of 165m and a reservoir depth of 6,000ft.

Western Isles Development Project (WIDP) Key Information

$1.6 billion
Dana Petroleum (operator with 77%) and Cieco (23%)
160km east of Shetland and 5km south of the Hudson Field
Development consists of two discovered oil fields Harris and Barra
Fields lie in 165m of water at reservoir depth of 6,000ft
Estimated at 100 mmboe with 45 mmboe economically recoverable
Peak production rates expected to be c. 40,000 boepd
Government approval received December 2012
First oil:
Expected in late 2015
Field life:
Estimated to be 15 years

Development Concept

  • Five production wells and four water injection wells
  • Two eight-slot subsea production manifolds and associated flowlines
  • Commingled reservoir fluids produced back to a new build FPSO
  • FPSO will use Sevan Marine design technology, constructed in China by China Ocean Shipping Company (COSCO)
  • FPSO will be owned by Dana and Cieco
  • Dana will operate the subsea facilities and pipelines
  • Oil will be exported via shuttle tanker
  • Up to three additional exploration wells planned

Sevan Marine ASA is specializing in design, engineering and project execution of floating units for offshore applications, with a main focus on Floating Production, Storage and Offloading units (FPSOs).

The Sevan design FPSO is under construction at COSCO shipyard in Qidong, China.

The Sevan hull is suitable for operation in water depths ranging from 30 m to more than 3,000 m and Sevan units may operate in both benign and harsh environments. Model tests have been made for the most extreme North Atlantic conditions as well as for the toughest cyclonic conditions with excellent results.

WIDP involves a subsea development of at least five production and four water injection wells plus two exploration wells tied back to a new build floating production, storage and offloading vessel (FPSO) with oil export using shuttle tankers.

The estimated investment in the Western Isles Development Project is $1.6bn. The Department of Energy and Climate Change (DECC) approved the WID Project in December 2012. Drilling works commenced in September 2013, two months ahead of schedule, by Diamond Offshore’s drilling rig Ocean Nomad. Installation of subsea systems was in progress as of April 2014. The FPSO, being built in China, will be ready for use in 2015. First oil production can be expected in October 2015. The field life is estimated to be 15 years.