The Tor oil field is a crude oil and associated gas producing field in the Norwegian sector of the central North Sea. Production of oil and gas started in 1978 and peak oil and gas was achieved in 1979. The field was shut down in 2015 and, following the completion of new wells, started up again in 2020.
The field The characteristics of the Tor field reservoir are as follows. +Tor field reservoirField nameTorReservoirLate Cretaceous and early PaleoceneBlock2/4 and 2/5Reservoir depth, metres3,200Gas Oil Ratio, scf/bbl1,500API gravity43°Sulfur0.1%Pressure, psia7,135DiscoveredNovember 1970Original recoverable reserves150-260 million bbls oil, 560-900 billion cf gasNow in reserve (2023)4.3 million m3 oe oil, 0.4 million m3 oe Gas, 0.3 million m3 oe NGL
Owners and operator The current (2024) owners of the Tor field are: +Tor field ownershipCompanyInterest, %TotalEnergies EP Norge AS48.19879ConocoPhillips Skandinavia AS30.65799Vår Energi ASA10.81656Sval Energi AS6.63922Petoro AS3.68744 The field is operated by ConocoPhillips Skandinavia AS.
Infrastructure The field has been developed with an offshore platform facility, designated Tor E. +Tor field platform Tor EParameterValueBlock2/4Latitude56.642072°NLongitude3.326958°EWater depth, metres70TypeFixed steelPlatform designKvaerner EngineeringTopsides designWorley EngineeringFunctionDrilling, production, accommodationBridgeTo flare towerSubstructure, tonnes5,275Topsides, tonnes6,448Legs8Piles8Well slots18 Accommodation58, in 1982 this was replaced by 96 berth accommodationInstalled in fieldJune 1975Design throughput101,600 bopd, 89 MMscfd gasProcessing3-phase (oil/gas/water) separator operating at 500 psig, gas dehydration by glycolExport7.5 mile, 14-inch gas pipeline and 12-inch oil pipeline to the Ekofisk R
Production Production started in July 1978. The production profile was as follows. Units are million standard cubic metres oil equivalent. +Tor field productionYearOil MMSm3 oeNGL MMSm3 oeGas MMSm3 oe19781.20735100.34077919794.5262960.1399541.15682519803.5895720.2775081.28760419811.8837890.2291881.17712619821.530730.2721851.34181319830.9679330.2546761.0870919840.867210.2174690.93560819850.8242050.2014940.77939219860.6245470.1167540.46358719870.4773630.0885230.34305819880.4828640.0955640.3181319890.5100030.089230.31237319900.4726420.0684140.24165119910.3462730.0377710.16119119920.3623460.0314010.14410819930.3458580.0224790.09479719940.3385990.0191340.07403419950.3386330.0178230.06736619960.3592420.017190.06288519970.346830.0173060.05708519980.2307110.0109770.03640419990.2214910.0107840.03713120000.2555720.0106770.04055620010.2568310.009880.03470820020.2135350.008180.02496420030.1628920.006660.01714420040.1971610.0083460.02141420050.1803490.0079570.01974420060.1642930.0085130.02381320070.3148270.0158910.05380920080.3071690.0125210.03296520090.2919490.0101270.02413820100.2370530.0070820.01399920110.2192720.0048780.00824220120.223390.0051510.00745920130.1988070.0045220.00831420140.1969790.0044820.00871820150.1809880.0035510.006555201600020170002018000201900020200.0174760.0008750.00143520210.8047160.0365590.07340920220.7195110.0354680.08871920230.5834910.0355110.117698
Developments Oil was initially produced by pressure reduction. From 1992, water flood was introduced.
Export from Tor was initially routed by two pipelines to Ekofisk R. Subsequently, in 1998, fluids were routed to Ekofisk 2/4 J.
In 1989, a gas-lift module was added, this allowed eight wells to use gas lift, compared to only three wells formerly.
In 2019, two subsea templates with eight horizontal production wells were tied back to Ekofisk centre.
The remaining recoverable reserves in 2023 were 4.3 million standard cubic meter oil equivalent oil, 0.4 million m3 oe Gas, 0.3 million m3 oe NGL.
See also Tyne, Trent and Tors gas fields Tor Formation Ekofisk oil field Albuskjell oil and gas field Cod oil gas and condensate field Eldfisk oil and gas field Odin gas field Embla oil and gas field
References