South Arne oil and gas field

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South Arne oil and gas field
CountryDenmark
RegionNorth Sea
Location/blocks5604/29 &30
Offshore/onshoreOffshore
Coordinates56.07835°N 4.22886°E
OperatorsHess (until 2021), Ineos (since 2021)
OwnerHess; DONG; Noreco; and Danoil (initially); Ineos (since 2021)
Field history
Start of production1999
Peak of production2,558,000 cubic metres oil/year
Production
Producing formationsChalk

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.

Contents

The field

The characteristics of the South Arne field reservoir are as follows. [1]

FieldSouth Arne
ReservoirChalk
Geological ageDanian and Upper Cretaceous
Offshore Block5604/29 &30
Reservoir depth2,800 m
Reservoir pressure and temperature434 bar and 90°C.
Field delineation93 km2
ReservesOil 12.9 million m3

Gas 2.6 billion Normal m3

Discovered1969

Owners and operators

The field was originally owned jointly by Hess 57.48%; DONG 34.58%; Noreco 6.56%; and Danoil 1.58%. [2] It was operated by Hess. In 2021 Hess Denmark sold its interests in South Arne to Ineos E&P for $150 million. [2]

Infrastructure

The field was initially developed through a single offshore installation (SA), two further field installations (WHPE and WHPN) were commissioned in 2013. [3]   [1] 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°E
Production start199920132013
Water depth60 m6060
InstallationConcrete gravity base and steel lattice drilling towerFixed steelFixed steel
AccessHelicopterBridge link to South ArneHelicopter
FunctionWellhead, process, accommodation (57 beds)WellheadsWellheads
Substructure weight tonnes112,8002,2242,333
Topsides weight tonnes8,9551,9321,762
Number of wells14 oil production, 7 water injection126
Export, 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 NybroTo 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. [4] The single anchor leg mooring (SAL) is located 2 km (56.09247°N 4.25615°E) from the South Arne installation. [4]

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. [5]

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. [4]

Production from the South Arne field is aided by water injection for pressure support. [1] 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. [2]

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) 2013-2022 [6]
Year2013201420152016201720182019202020212022Total
Oil7001,0231,03094677457056547940834729,802
Gas1672383073702811871671321081087,665
South Arne annual oil production (1000 m3) and gas production (million Normal m3) 1999-2012 [6]
Year19992000200120022003200420052006200720082009201020112012
Oil7572,5582,0312,3132,3832,2572,3711,8691,2451,1391,1641,0661,004803
Gas167713774681544461485366234225271248238194

See also

References

  1. 1 2 3 "Oil and gas production in Denmark 2013" (PDF). Retrieved 24 November 2023.
  2. 1 2 3 "A barrel full South Arne oil field" . Retrieved 24 November 2023.
  3. ↑ "OSPAR Inventory of Offshore Installations - 2021" . Retrieved 24 November 2023.
  4. 1 2 3 "South Arne Oil and Gas Project, Danish North Sea" . Retrieved 24 November 2023.
  5. ↑ "Hejre to South Arne Development Project" (PDF). Retrieved 24 November 2023.
  6. 1 2 "Danish Energy Agency. "Monthly and yearly production"". 15 August 2016. Retrieved 24 November 2023.

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