Statfjord was discovered by Mobil in 1974, and Statoil took over the operatorship on 1 January 1987.
The field has been developed with the Statfjord A, B and C production platforms, which all have concrete gravity base structures incorporating storage cells.
Statfjord A began production on 24 November 1979.
Statfjord B followed on 5 November 1982, and Statfjord C on 26 June 1985.
The Norwegian share of the field lies in blocks 33/9 and 33/12 in production licence 037, while the British part is in UK block 211/25 in licences 104 and 293.
The field will remain in production until 2025 and possibilities to furter expand the lifetime are being looked into.
Statfjord is one of the oldest producing fields on the Norwegian continental shelf, and the largest oil discovery in the North Sea.
When drilling and well work are under way on the field, about 200 people are employed on Statfjord A, 200 on the B platform and 240 on Statfjord C. Personnel do 12-hour shifts in a 14-day offshore tour, followed by a month off.
Almost 400 people used to be transported to and from Statfjord every day. This number is now substantially reduced, partly because activities have been discontinued or moved to land.
Oil and gas transport
Statfjord oil production is loaded into shuttle tankers on the field and shipped to a number of ports in north-western Europe.
The Norwegian share of gas from the field is piped to the Kårstø processing complex north of Stavanger and on to continental Europe.
Britain’s 14.53 per cent of the gas travels by pipeline via the Brent field to Scotland.
Cargoes are allocated between the field licensees in proportion to their interest in the respective licences.
The storage cells on the Statfjord A hold 206 000 standard cubic metres, 1,3 million barrels of oil
The storage cells on the Statfjord B hold 302 000 standard cubic metres, 1,9 million barrels of oil
The storage cells on the Statfjord C hold 302 000 standard cubic metres, 1,9 million barrels of oil
Oil and gas production
The hydrocarbon reservoir formations on Statfjord lie at depths of 2 500-3 000 metres.
They consist of sandstones, with the oil and gas held in pores between the individual sand grains.
These hydrocarbon-bearing sediments were all deposited in the Jurassic era, about 150 million years ago.
Roughly 80 000 barrels of oil per day are produced by the Statfjord Unit licence group, which unites all the licences and includes all three Statfjord platforms and satellite fields tied in to Statfjord C.
The production record for a single day on Statfjord was set on 16 January 1987, when 850 204 barrels were produced.
Roughly four million cubic metres of gas are exported daily by the Statfjord Unit.