# Eldfisk oil and gas field

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 field

The characteristics of the Eldfisk field reservoir are as follows.
Eldfisk field reservoir :
| Field | 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 million barrels oil; 107 to 3.0 billion cubic feet gas |

## Owners and operator

Currently (2024), the owners of the Eldfisk field and their respective stakes 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 field is operated by ConocoPhillips Skandinavia AS.

## Infrastructure

The Eldfisk field was originally developed through the use of three offshore platforms.
Eldfisk original platforms :
| Name | 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 |

### Field development

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 development platforms :
| Name | 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 |

## Production

The original production capabilities were as follows.
| Parameter | Eldfisk ‘A’ | Eldfisk ‘FTP’ | Eldfisk ‘B’ |
| Production throughput | 11,300 Nm$^3$/d oil | | 75,500 bopd |
| Production throughput | 3.2 mm Nm$^3$/d gas | | 83 mmscfd |
| Peak field production | 250,000 bopd | 250,000 bopd | 250,000 bopd |
| 545 mmcfgd |||
| Separation pressure | | | 515 psia |
| Processing | | Separation, gas dehydration and compression | Separation, gas dehydration and compression |
Eldfisk production profile is as follows.
Eldfisk production 1979 to 2023 :
| Year | Oil (million standard m$^3$ oil equivalent | NGL (MSm$^3$OE) | Gas (MSm$^3$OE) |
| 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 |