Dan oil field
CountryDenmark
Location/blocks7.3
LocationDanish sector North Sea
Offshore/onshoreOffshore
OperatorMaersk Oil
Field history
Discovery1971
Start of development1971
Start of production1972
Peak of production10,000 bopd
Peak year1977
Production
Peak of production (oil)10,000 barrels per day (~5.1×10^5 t/a)
Estimated oil in place125 million barrels (~1.74×10^7 t)
Recoverable gas1,200×10^9 cu ft (34×10^9 m3)
Producing formationsUpper Cretaceous chalk

The Dan oil field is a large oil and associated gas field in the Danish sector of the North Sea, about 200 kilometres (120 mi) west of Esbjerg. Oil and gas are produced through a complex of offshore installations. The Kraka and Regnar fields are satellites to the Dan installations.

The field

The Dan field was discovered in May 1971 by the Britannia oil rig in Denmark Block 7.3 of the North Sea.[1] The reservoir is an Upper Cretaceous Danian chalk at a depth of 5,800 to 6,400 feet (1,768 to 1,951 metres). The oil has an API gravity of 30.4 and a gas oil ratio of 600 standard cubic feet per barrel (scf/bbl). The estimated recoverable reserves are 90–125 million barrels (14.3–19.9 million cubic metres) of oil and 1.2–1.3 trillion cubic feet (34–37 billion cubic metres) of gas.[1]

Development

The field was developed in phases through multi-platform installations, summarized as follows:[1][2][3]

Dan field installations
Platform Function Configuration Type Legs Well slots Installed Production start Production to
Dan A Wellhead drilling Bridge linked Steel Jacket 4 6 September 1971 July 1972 Dan B
Dan B Processing Steel Jacket 4 – 1972 July 1972 Oil to Gorm C; Gas to Tyra
Dan C Separator and Flare Steel Jacket 3 – 1972 July 1972 –
Dan D Wellhead drilling Steel Jacket 4 6 March 1975 1976 Dan B
Dan E Wellhead drilling Stand alone Steel Jacket 4 6 April 1976 1977 Dan B (pipeline)
Dan FA Wellhead drilling Bridge linked Steel Jacket 1986 Dan FC
Dan FB Wellhead drilling Steel Jacket 1986 Dan FC
Dan FC Processing Steel Jacket – 1986 Oil to Tyra; gas to Gorm
Dan FD Flare Steel Jacket – 1992 –
Dan FE Wellhead Dan FC
Dan FF Wellhead and processing Steel Jacket
Dan FG Processing Steel Jacket – 2004


Production of condensate (in 1000s of barrels) was:[1]

Kraka and Regnar fields

The Kraka and Regnar fields are satellites to the Dan installation. The characteristics of the fields are as follows.

Kraka and Regnar fields[2][4]
Field Kraka Regnar
Prospect Anne Nils
Reservoir Chalk Chalk
Geological age Danian and Upper Cretaceous Upper Cretaceous
Coordinates 55.402045°N 5.078377°E 55.385323°N 4.288464°E
Block 5505/17 5505/17
Reservoir depth 1,800 m 1,700 m
Field delineation 81 km2 34 km2
Reserves
Discovered 1966 1979

The fields are developed through two offshore installations as shown.

Kraka and Regnar field Installations[2][4]
Field Kraka Regnar
Production start 1991 1993
Water depth 45 m 45 m
Installation Fixed steel no helideck Subsea steel
Function Wellheads no processing Wellhead no processing
Substructure weight tonnes 550 50
Topsides weight tonnes 400 -
Number of wells 8 1
Status Producing (2022) No production since 2006
Export, well fluids 9 km 8-inch pipeline to Dan FA 13 km 8-inch pipeline to Dan FA
Import, lift gas 9 km 3-inch pipeline from Dan FA -

The oil production profile of the Kraka and Regnar fields (in 1000 cubic metres) is as shown.

Kraka and Regnar annual oil production (1000 m3) 1991-2007[5]
Year 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007
Kraka 144 205 390 491 469 340 315 314 404 350 253 157 139 199 211 222 176
Regnar 145 429 86 41 27 43 29 14 33 18 19 19 16 11 0
Kraka and Regnar annual oil production (1000 m3) 2008-2022[5]
Year 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 Total
Kraka 112 37 67 170 129 101 89 146 116 113 108 104 115 145 79 6,407
Regnar 930

See also

References

  1. 1 2 3 4 Oilfield Publications Limited (1985). The North Sea Platforms Guide. Ledbury UK: Oilfield Publications Limited. pp. 144–52.
  2. 1 2 3 "MAERSK OIL ENVIRONMENTAL AND SOCIAL IMPACT STATEMENT – DAN" (PDF). ens.dn. 2015. Archived (PDF) from the original on 2021-10-04. Retrieved 4 October 2021.
  3. ↑ "DUC in the North Sea". Archived from the original on 2021-10-04. Retrieved 4 October 2021.
  4. 1 2 OSPAR. "OSPAR Inventory of Offshore Installations - 2021". Retrieved 17 November 2023.
  5. 1 2 Danish Energy Agency. "Monthly and yearly production". Retrieved 17 November 2023.

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