The Schiehallion Area incorporates the Schiehallion, Loyal and Alligin fields located around 175 kilometres west of the Shetland Islands. Schiehallion and Loyal are developed through the Glen Lyon floating production, storage and offloading (FPSO) vessel. Alligin was sanctioned in 2018 and is being developed as a two-well subsea tieback to the Glen Lyon and is expected to come on stream in 2020.
Production from the Schiehallion Area was shut-in between 2013 and 2017 to allow for the Quad 204 project – a multi-billion-pound investment by bp and partners to completely redevelop the hub and maximise production from the fields. Quad 204 saw the removal of the old FPSO, construction and installation of the Glen Lyon FPSO and renewal of much of the subsea infrastructure network.
Through the Quad 204 project, bp and partners expect to unlock a further estimated 450 million barrels of resources, extending the life of the fields out to 2035 and beyond.
With an estimated seven to eight billion barrels of oil in place, the Clair field is the largest oilfield on the UK Continental Shelf. The field, located 75 kilometres west of the Shetland Islands, was discovered in 1977, but challenging reservoir characteristics and the technological limits of the time meant it was the mid-1990s before the field saw extensive drilling and 2001 before bp and partners approved a development plan. Production from the Clair field began in 2005 through the Clair Phase One platform which was the first fixed platform west of Shetland.
The physical size of the Clair field dictates development via a phased approach. Clair Ridge is the second phase of development. The bridge-linked platforms, which delivered first oil in November 2018, are designed to recover an estimated 640 million barrels of oil and ramp up to 120,000 barrels of oil per day at peak production. The new facilities, which are designed for 40 years of production, required capital investment in excess of £4.5 billion. bp and partners are now considering a third phase of development in the Clair field.
The Foinaven field is located 190 kilometres west of Shetland in water depths of up to 500 metres. The field was discovered in 1990 and sanctioned for development in 1994. It was the first deepwater development on the UKCS and the first west of Shetland. First oil from the field was in November 1997. The pioneering fast-track development was based on a network of subsea wells linked via a subsea network of pipelines, control umbilicals and risers to the Petrojarl Foinaven FPSO.
ETAP ranks as one of the largest and most commercially complex North Sea oil and gas developments of the past 20 years; multiple fields with varying ownership sharing a central processing facility (CPF). bp operates six of the seven ETAP fields; Machar, Madoes, Mirren, Mungo, Monan and Marnock. The non-operated Seagull field (bp ownership share 50%) will be tied back to the ETAP CPF with first production expected in 2021. We are exploring options to develop another new field, Skua, through the ETAP hub.
ETAP came on stream in July 1998 with an estimated production life of 20 years. However, a multi-million-pound investment programme in 2015 secured its future well into the 2030s.
In the two decades of operations, more than 550 million barrels of oil equivalent (gross) have been produced from the bp-operated ETAP fields.
The Andrew Area includes the Andrew, Arundel, Cyrus, Farragon and Kinnoull fields which all produce through the Andrew platform. The field started production in 1994. Andrew, Cyrus and Farragon were shut in in mid-2011 to allow for the Andrew Area Development (AAD), a major brownfield project enabling the Kinnoull field, located 28 kilometres to the north, to be developed through the existing facilities.
The ADD also included extensive new subsea infrastructure, a new 750-tonne process module and structural strengthening of the platform. In 2017, the Arundel field came on stream - only 18 months after project sanction. The Andrew Area is expected to produce into the mid-2020s.
The Total-operated Culzean field (bp ownership share 32%) is one of the largest new projects to be sanctioned in the North Sea in recent years and is expected to supply around 5% of UK gas requirements. The field was sanctioned in 2015 and comprises a high-pressure.high-temperature gas condensate reservoir. First gas is expected in 2019.
The Shell-operated Shearwater field (bp ownership share 28%) is a high-pressure, high-temperature gas condensate field located in the Central North Sea. Shearwater was brought online in 2000 and has been developed through two fixed platforms. Shearwater remains among the biggest producing fields in the North Sea and is anticipated to continue operating into the 2020s.
Vorlich is a two-well development in the central North Sea which has been developed as a subsea tieback to the Ithaca Energy-operated FPF-1 floating production facility which lies at the centre of Ithaca’s Greater Stella Area production hub. It has over 30-million-barrels of recoverable oil in place and is located approximately 241 kilometres east of Aberdeen. It came on stream in November 2020.