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

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The characteristics of the Eldfisk field reservoir are as follows.[1][2][3]

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 MMbbls (million barrels) oil; 107 to 3.0 bcf (billion cubic feet) gas

Owners and operator

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Currently (2024), the owners of the Eldfisk field and their respective stakes are:[1]

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.[1]

Infrastructure

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The Eldfisk field was originally developed through the use of three offshore platforms.[3]

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

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A water injection facility Eldfisk E was installed in the field in 1999.[1] This facility also supplies water to Ekofisk K. A new integrated facility, Eldfisk S, started operation in 2015.[1] 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.[1]

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

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The original production capabilities were as follows.[3]

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

Eldfisk production profile is as follows.[1]

Eldfisk production 1979 to 2023
Year 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

See also

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Reference

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  1. ^ a b c d e f g "Eldfisk field". Retrieved 9 July 2024.
  2. ^ "OSPAR Inventory of Offshore Installations - 2021". Retrieved 9 July 2024.
  3. ^ a b c Oilfield Publications Limited (1985). The North Sea Platform Guide. Ledbury: Oilfield Publications Limited. pp. 113–119.