The Dan oil field is a large oil and associated gas field in the Danish sector of the North Sea, about 200 kilometres (120 miles) 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.
| Dan oil field | |
|---|---|
| Country | Denmark |
| Location/blocks | 7.3 |
| Location | Danish sector North Sea |
| Offshore/onshore | Offshore |
| Operator | Maersk Oil |
| Field history | |
| Discovery | 1971 |
| Start of development | 1971 |
| Start of production | 1972 |
| Peak of production | 10,000 bopd |
| Peak year | 1977 |
| Production | |
| Peak of production (oil) | 10,000 barrels per day (~5.1×105 t/a) |
| Estimated oil in place | 125 million barrels (~1.74×107 t) |
| Recoverable gas | 1,200×109 cu ft (34×109 m3) |
| Producing formations | Upper Cretaceous chalk |
The field
editThe 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
editThe field was developed in phases through multi-platform installations, summarized as follows:[1][2][3]
| 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]
Graphs are unavailable due to technical issues. There is more info on Phabricator and on MediaWiki.org. |
Kraka and Regnar fields
editThe Kraka and Regnar fields are satellites to the Dan installation. The characteristics of the fields are as follows.
| 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.
| 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.
| 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 |
| 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
editReferences
edit- ^ a b c d Oilfield Publications Limited (1985). The North Sea Platforms Guide. Ledbury UK: Oilfield Publications Limited. pp. 144–52.
- ^ a b c "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.
- ^ "DUC in the North Sea". Archived from the original on 2021-10-04. Retrieved 4 October 2021.
- ^ a b OSPAR. "OSPAR Inventory of Offshore Installations - 2021". Retrieved 17 November 2023.
- ^ a b Danish Energy Agency (15 August 2016). "Monthly and yearly production". Retrieved 17 November 2023.