The South Arne (Danish: Syd Arne) field is a major crude oil and associated gas production field in the Danish sector of the central North Sea. Production of oil and gas started in 1999, and peak oil and gas was in 2000.

The field The characteristics of the South Arne field reservoir are as follows. FieldSouth ArneReservoirChalkGeological ageDanian and Upper CretaceousOffshore Block5604/29 &30Reservoir depth2,800 mReservoir pressure and temperature434 bar and 90°C. Field delineation93 km2ReservesOil 12.9 million m3

Gas 2.6 billion Normal m3Discovered1969

Owners and operators The field was originally owned jointly by Hess 57.48%; DONG 34.58%; Noreco 6.56%; and Danoil 1.58%. It was operated by Hess. In 2021 Hess Denmark sold its interests in South Arne to Ineos E&P for $150 million.

Infrastructure The field was initially developed through a single offshore installation (SA), two further field installations (WHPE and WHPN) were commissioned in 2013.  Details are summarised below. +South Arne installations NameSouth Arne (SA)WHPE Wellhead platform East (SA WHPE)WHPN Wellhead platform North (SA WHPN)Coordinates56.07835°N 4.22886°E56.07823°N 4.230876°E56.09574°N 4.219251°EProduction start199920132013Water depth60 m6060InstallationConcrete gravity base and steel lattice drilling tower Fixed steelFixed steelAccessHelicopterBridge link to South ArneHelicopterFunctionWellhead, process, accommodation (57 beds)WellheadsWellheadsSubstructure weight tonnes112,8002,2242,333Topsides weight tonnes8,9551,9321,762Number of wells14 oil production, 7 water injection126Export, liquidsTo subsea oil storage then by single anchor leg mooring (SAL) to tankerTo South ArnePipeline Bundle to WHPE (production P/L, lift gas and water injection)Export, gas285 km 24-inch pipeline to Nybro To South Arne

The subsea oil tank has a capacity of 87,000 m3 (547,230 barrels). It is 110 m by 90 m by 18 m high. The single anchor leg mooring (SAL) is located 2 km (56.09247°N 4.25615°E) from the South Arne installation.

Hejre tie back There are plans to tie-in the Hejre platform into South Arne WHPE. This would be via a 30 km 10-inch or 12-inch multiphase pipeline. South Arne has sufficient capacity to process the Hejre fluids.

Production Production facilities comprise a single three-stage oil/gas/water separator train capable of processing 50,000 barrels of oil per day (8,065 m3/day), 2 million m3 of gas per day, and 100,000 barrels of water per day (16,129 m3/day), The gas compression is a single four-stage train.

Production from the South Arne field is aided by water injection for pressure support. Some produced water is injected into the reservoir, the remainder is treated and discharged overboard. Injection water is treated to remove sulphate ions prior to injection.

The oil and gas production profile of the South Arne field is as shown in the tables. +South Arne annual oil production (1000 m3) and gas production (million Normal m3) 2013-2022Year2013201420152016201720182019202020212022TotalOil7001,0231,03094677457056547940834729,802Gas1672383073702811871671321081087,665 +South Arne annual oil production (1000 m3) and gas production (million Normal m3) 1999-2012Year19992000200120022003200420052006200720082009201020112012Oil7572,5582,0312,3132,3832,2572,3711,8691,2451,1391,1641,0661,004803Gas167713774681544461485366234225271248238194

See also

Gorm Field Tyra field Dan oil field Halfdan field Siri, Nini and Cecilie oil fields Valdemar oil and gas field Skjold oil field Harald gas field Ravn oil field

References