The Eldfisk oil and gas field is a crude oil and gas producing field in the Norwegian sector of the central North Sea. Production of oil and gas started in 1979 and peak oil and gas production was achieved in 1980. The facilities have been extended and are still operational.
The characteristics of the Eldfisk field reservoir are as follows. [1] [2] [3]
| Eldfisk | ||
| Reservoir | Upper Cretaceous to Danian Chalk | |
| Block | 2/7a | |
| Reservoir depth | 9,500 feet, 600 feet pay | |
| API gravity | 33° | |
| Gas Oil ratio (GOR) | 1,525 scf/bbl (standard cubic feet / barrel) | |
| Sulphur content | 0.2% | |
| Pressure | 6,815 psi (46,988 kPa) | |
| Discovered | December 1970 | |
| Recoverable reserves | 502 MMbbls (million barrels) oil; 107 to 3.0 bcf (billion cubic feet) gas |
The current (2024) owners of the Eldfisk field are:
| Company | Interest | |
|---|---|---|
| TotalEnergies EP Norge AS | 39.896 % | |
| ConocoPhillips Skandinavia AS | 35.112 % | |
| Vår Energi ASA | 12.388 % | |
| Sval Energi AS | 7.604 % | |
| Petoro AS | 5 % |
The Eldfisk field was originally developed through the use of three offshore platforms.
| Eldfisk ‘A’ | Eldfisk ‘FTP’ | Eldfisk ‘B’ | ||
| Coordinates | 56.376881°N 3.265803°E | 56.265933°N 3.265803°E | 56.419331°N 3.218394°E | |
| Block | 2/7 | 2/7 | 2/7 | |
| Water depth, metres | 71 | 71 | 71.5 | |
| Bridge | To ‘FTP’ | To ‘A’ and to flare structure | None | |
| Installed | July 1975 | unknown | May 1976 | |
| Function | Drilling, production and accommodation; now well | Separation, dehydration, compression | Drilling, production and accommodation | |
| Production start | August 1979 | August 1979 | December 1979 | |
| Type | Steel jacket | Steel jacket | Steel jacket | |
| Jacket weight, tonnes | 4,206 | 2,689 | 4,353 | |
| Total weight, tonnes | 13,410 | 10,615 | 15,513 | |
| Number of wells | 30 (30 slots) | None | 19 (20 slots) | |
| Legs | 12 | 8 | 12 | |
| Piles | 12 | 8 | 12 | |
| Status | Operational | Operational | Operational | |
| Export, liquids | Bridge to FTP | 24-inch 3.5-mile pipeline to Eldfisk ‘B’ | 24-inch 11-mile pipeline to Ekofisk R | |
| Export, gas | Bridge to FTP | 30-inch 3.5-mile pipeline to Eldfisk ‘B’ | 30-inch 11-mile pipeline to Ekofisk R | |
| Design contractor | Brown and Root, Worley Engineering | Brown and Root, Worley Engineering | Brown and Root | |
| Jacket fabrication | NAPM, Vlissingen | UIE, St Wandrille | NAPM, Vlissingen | |
| Deck fabrication | Weldit | Dragados Spain | Weldit | |
| Accommodation | 72, replacement 112 | None | 96 |
A water injection facility Eldfisk E was installed in the field in 1999. This facility also supplies water to Ekofisk K. A new integrated facility, Eldfisk S, started operation in 2015. This is connected by bridge to Eldfisk E. This facility replaces several functions of Eldfisk A and Eldfisk FTP. Eldfisk A has been converted into a wellhead platform and Eldfisk FTP is used as bridge-support facility. The Embla oil and gas field, located south of Eldfisk, is tied back to Eldfisk S.
| Eldfisk ‘E’ | Eldfisk ‘S’ | ||
| Coordinates | 56.375086°N 3.265207°E | 54.37374°N 3.262698°E | |
| Block | 2/7 | 2/7 | |
| Water depth, metres | 72 | 72 | |
| Type | Fixed steel | Fixed steel | |
| Installed | September 2000 | May 2013 | |
| Jacket weight, tonnes | 3,215 | 13,000 | |
| Topsides weight, tonnes | 6,857 | 15,900 | |
| Bridge | Eldfisk FTP | Eldfisk E | |
| Function | Water injection | Production |
The original production capabilities were as follows.
| Parameter | Eldfisk ‘A’ | Eldfisk ‘FTP’ | Eldfisk ‘B’ | |
| Production throughput | 11,300 Nm3/d oil | 75,500 bopd | ||
| 3.2 mm Nm3/d gas | 83 mmscfd | |||
| Peak field production | 250,000 bopd | |||
| 545 mmcfgd | ||||
| Separation pressure | 515 psia | |||
| Processing | Separation, gas dehydration and compression | Separation, gas dehydration and compression | ||
| Oil (million standard m3 oil equivalent | NGL (MSm3OE) | Gas (MSm3OE) | ||
| 1979 | 1.712171 | 0.07268 | 0.412552 | |
| 1980 | 5.875162 | 0.295319 | 1.495868 | |
| 1981 | 4.933234 | 0.28094 | 1.511063 | |
| 1982 | 4.114687 | 0.278639 | 1.385161 | |
| 1983 | 3.714956 | 0.328743 | 1.439742 | |
| 1984 | 3.380447 | 0.295573 | 1.389068 | |
| 1985 | 3.37752 | 0.33031 | 1.393686 | |
| 1986 | 3.357574 | 0.305772 | 1.443272 | |
| 1987 | 3.144948 | 0.294376 | 1.35857 | |
| 1988 | 3.82161 | 0.510611 | 2.246695 | |
| 1989 | 4.205455 | 0.558868 | 1.56655 | |
| 1990 | 3.68102 | 0.481153 | 1.309914 | |
| 1991 | 2.980452 | 0.328683 | 1.982256 | |
| 1992 | 2.784801 | 0.271134 | 1.841552 | |
| 1993 | 2.450877 | 0.250734 | 1.711507 | |
| 1994 | 2.229795 | 0.22939 | 1.548579 | |
| 1995 | 2.692235 | 0.291626 | 1.995236 | |
| 1996 | 2.334067 | 0.242935 | 1.670471 | |
| 1997 | 2.353065 | 0.259537 | 1.703038 | |
| 1998 | 1.517407 | 0.168756 | 1.067927 | |
| 1999 | 1.164147 | 0.100657 | 0.556743 | |
| 2000 | 1.272862 | 0.117158 | 0.6638 | |
| 2001 | 1.99595 | 0.145434 | 0.74928 | |
| 2002 | 2.392482 | 0.163374 | 0.926202 | |
| 2003 | 2.41857 | 0.141576 | 0.742094 | |
| 2004 | 3.163272 | 0.184533 | 0.884927 | |
| 2005 | 3.510821 | 0.177832 | 0.860075 | |
| 2006 | 3.012221 | 0.15245 | 0.693708 | |
| 2007 | 2.644137 | 0.121008 | 0.53389 | |
| 2008 | 3.022456 | 0.13646 | 0.56242 | |
| 2009 | 2.858015 | 0.117331 | 0.484842 | |
| 2010 | 2.873997 | 0.114753 | 0.50499 | |
| 2011 | 2.89384 | 0.108093 | 0.475727 | |
| 2012 | 2.644953 | 0.089178 | 0.283571 | |
| 2013 | 1.92996 | 0.06943 | 0.256955 | |
| 2014 | 1.954917 | 0.069333 | 0.275454 | |
| 2015 | 2.380954 | 0.08552 | 0.340688 | |
| 2016 | 2.457843 | 0.082901 | 0.324835 | |
| 2017 | 2.532525 | 0.084259 | 0.340787 | |
| 2018 | 2.429397 | 0.077286 | 0.276703 | |
| 2019 | 2.325186 | 0.074895 | 0.244598 | |
| 2020 | 2.484702 | 0.111038 | 0.247082 | |
| 2021 | 2.612156 | 0.117412 | 0.302349 | |
| 2022 | 2.301337 | 0.090945 | 0.222865 | |
| 2023 | 2.23726 | 0.083059 | 0.20453 |