Edda oil and gas field

The Edda oil and gas field was a crude oil and associated gas production field in the Norwegian sector of the central North Sea. Production of oil and gas started in 1979, peak oil and gas was achieved in 1980. Production ceased in 1998 and the installation and field infrastructure were dismantled in 2012.

The field

edit

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

Edda field properties
Field Edda
Reservoir Maastrichtian and lower Paleocene chalk.

Upper Cretaceous Tor formation

Block 2/7a
Reservoir depth 3100 m, 10,500 feet
API gravity 33-39°
Gas Oil ratio (GOR) 1,125 scf/bbl (standard cubic feet / barrel)
Sulphur content 0.1%
Pressure 7,175 psi (49,470 kPa)
Discovery September 1972
Recoverable reserves 44-68 MMbbls (million barrels) oil; 220-600 bcf (billion cubic feet) gas

Owner and operator

edit

The field was owned and operated by ConocoPhillips Skandinavia AS.[2]

Infrastructure

edit

The field was developed through a single offshore installation, designated Edda ‘C’.[1] [2] [3]

Edda infrastructure
Name Edda ‘C’
Coordinates 56.464839°N 3.104464°E
Water depth 71m
Bridge To flare structure
Installation May 1978
Function Production and accommodation
Production start 1979
Type Steel jacket
Substructure weight tonnes 6,155
Topsides weight tonnes 10,390
Number of wells 13 (15 slots)
Legs 12
Piles 12
Flare 3-leg jacket
Status Decommissioned
Export, liquids 10-inch 8-mile pipeline to Ekofisk R
Export, gas 12-inch 8-mile pipeline to Ekofisk R
Design contractor Brown and Root
Jacket fabrication NAPM Vlissingen
Deck fabrication RDL Methil
Accommodation 48

Production

edit

The design production capacity was 4,100 Nm3/day oil and 1 million Nm3/day gas. Initial separation was at 515 psia (35.5 bar). Process facilities included gas dehydration and oily water treatment.[1]

Production from the Edda field was by natural depletion. From 1988 gas from Tommeliten Gamma was used as gas lift for the Edda wells. The oil, NGL (natural gas liquids)and gas production profile of the Edda field is as shown.[2]

Edda production profile
Year Oil (million standard m3 oil equivalent NGL (MSm3OE) Gas (MSm3OE)
1979 0.049088 0.002244 0.010064
1980 1.260264 0.084601 0.420312
1981 0.717792 0.071256 0.408622
1982 0.423624 0.055091 0.296568
1983 0.291055 0.044767 0.200605
1984 0.231917 0.029223 0.133306
1985 0.19199 0.022817 0.089882
1986 0.139436 0.01308 0.051593
1987 0.049961 0.00408 0.014713
1988 0.079292 0.006468 0.018187
1989 0.170931 0.014284 0.044442
1990 0.178578 0.015096 0.049031
1991 0.144094 0.009506 0.037357
1992 0.168869 0.009709 0.042032
1993 0.136341 0.007884 0.032994
1994 0.136903 0.007414 0.031291
1995 0.145824 0.007139 0.031132
1996 0.138113 0.006296 0.031357
1997 0.103684 0.005044 0.020162
1998 0.059554 0.003026 0.012671

Over this period, Edda produced 30.3 million barrels of oil, 1.97 million scm of gas and 21 000 tonnes of NGL. [4]

Edda ‘C’ ceased in production in 1998 and the installation was removed from the field in 2012.[2]

See also

edit

References

edit
  1. ^ a b c The North Sea Platform Guide. Ledbury: Oilfield Publications Limited. 1985. pp. 199–200.
  2. ^ a b c d e "Edda field data". Retrieved 8 June 2024.
  3. ^ a b "OSPAR Inventory of Offshore Installations - 2021". Retrieved 8 June 2024.
  4. ^ "Oil and gas fields in Norway" (PDF). Retrieved 11 July 2024.