Troll
North Sea · Oil/gas · Producing · Operator Equinor Energy AS
Troll is an oil and gas field in the North Sea operated by Equinor Energy AS, discovered in 1979 by wellbore 31/2-1. The Norwegian Offshore Directorate lists it as producing.
In the 12 months reported through August 2026 it sold 43.7 million Sm³ of oil equivalents (1.24 million Sm³ of oil, 41.44 billion Sm³ of gas), down 3% on the 12 months before.
Since January 1990 it has reported 1,248.5 million Sm³ of oil equivalents: 295.6 million Sm³ of oil and 920.9 billion Sm³ of gas.
5 companies hold it; the largest share is Petoro AS with 55.93%.
830 wellbores are on file for the field.
- 43.7
- mill Sm³ o.e., last 12 reported -3%
- 1.24
- mill Sm³ oil, last 12
- 41.4
- bill Sm³ gas, last 12
- 1,248
- mill Sm³ o.e. since Jan 1990
- 830
- wellbores on file
- 5
- licensees today
SODIR PRODUCTION PROFILES · SALEABLE VOLUMES · REPORTED THROUGH AUG 2026
Oil by month
TEN YEARS · SM³ SOLD
Last 12 months 1,241,661 · prior 12 1,558,072(-20%)
Gas by month
TEN YEARS · SM³ SOLD
Last 12 months 41,435,248,000 · prior 12 42,293,702,000(-2%)
Produced water by month
TEN YEARS · SM³ IN THE FIELD
Last 12 months 17,116,781 · prior 12 17,658,326(-3%)
Licensees
SHARES TODAY · UNIT TROLL UNIT
| Company | Share | Since |
|---|---|---|
| Petoro AS | 55.9284% | Sep 1, 2024 |
| Equinor Energy ASOPERATOR | 30.5548% | Sep 1, 2024 |
| A/S Norske Shell | 8.1853% | Sep 1, 2024 |
| TotalEnergies EP Norge AS | 3.691% | Sep 1, 2024 |
| ConocoPhillips Skandinavia AS | 1.6406% | Sep 1, 2024 |
Reserves
THE DIRECTORATE'S ESTIMATE · AS OF DEC 31, 2025
These are the Norwegian Offshore Directorate's own year-end estimates, shown as it publishes them. Petrora does not estimate reserves.
| Oil, mill Sm³ | Gas, bill Sm³ | NGL, mill tonnes | Condensate, mill Sm³ | O.e., mill Sm³ | |
|---|---|---|---|---|---|
| Originally recoverable | 299.6 | 1,474 | 21.6 | 1.52 | 1,816 |
| Remaining | 3.3 | 559.2 | 7.28 | 0 | 576.3 |
About the field
WRITTEN BY THE NORWEGIAN OFFSHORE DIRECTORATE
- Development
- Troll is a field in the northern part of the North Sea. The water depth is 300-330 metres. Troll was discovered in 1979, and the initial plan for development and operation (PDO) was approved in 1986. The plan was updated in 1990 and involved the transfer of gas processing to the Kollsnes terminal. The production started in 1995. A phased development was pursued for the Troll field, with Phase I recovering gas reserves in Troll Øst and Phase II focusing on the oil reserves in Troll Vest. Troll Phase I has been developed with Troll A, which is a fixed wellhead and compression platform with a concrete substructure. Troll A receives power from shore. The gas compression capacity at Troll A was increased in 2004/2005, and again in 2015. Troll Phase II was developed with Troll B, a floating concrete accommodation and production platform, and Troll C, a semi-submersible accommodation and production steel platform. The oil is produced from several subsea templates tied-back to Troll B and Troll C by flowlines. The production from Troll C started in 1999. The Troll C platform is also utilised for production from the Fram field. Several PDO amendments were approved in connection with various subsea templates at Troll Vest. A PDO for Troll Phase III (gas production from Troll Vest) was approved in 2018 and the production started in 2021. An amended PDO for power from shore to Troll Vest was approved in 2021, and both Troll B and Troll C have been operated partly with power from shore since 2024.
- Reservoir
- Troll contains very large amounts of gas resources and is also one of the largest oil producing fields on the Norwegian continental shelf. The field has two main structures: Troll Øst and Troll Vest. About two-thirds of the recoverable gas reserves lie in Troll Øst. The gas and oil reservoirs in the Troll Øst and Troll Vest structures consist primarily of shallow marine sandstone of Late Jurassic age in the Sognefjord Formation. Part of the reservoir is also in the underlying Fensfjord Formation of Middle Jurassic age. The field consists of three relatively large, rotated fault blocks. The eastern fault block constitutes Troll Øst. The reservoir depth at Troll Øst is 1330 metres. Pressure communication between Troll Øst and Troll Vest has been proven. Originally, the oil column in Troll Øst was mapped to be 0-4 metres thick. A well drilled in 2007 proved an oil column of 6-9 metres in the Fensfjord Formation in the northern segment of Troll Øst. The Troll Vest oil province originally had a 22 to 26-metre-thick oil column under a small gas cap, located at a depth of 1360 metres. The Troll Vest gas province originally had an oil column of 12-14 metres under a gas column of up to 200 metres. The oil column is now reduced to a thickness of only 1 to 5 metres. A significant volume of residual oil is encountered directly below the Troll Vest oil column.
- Recovery strategy
- The gas in Troll Øst is recovered by pressure depletion through 39 wells drilled from Troll A. The oil in Troll Vest is produced from long horizontal wells, which penetrate the thin oil zone directly above the oil-water contact. The recovery strategy is based primarily on pressure depletion, but this is accompanied by a simultaneous expansion of both the gas cap above the oil zone and the underlying water zone. Some gas is also reinjected. Produced water was reinjected into the northern part of the Troll Vest oil province from 2000 to 2016.
- Transport
- The gas from Troll Øst and Troll Vest is transported through three multiphase pipelines to the gas processing plant at Kollsnes. The condensate is separated from the gas and transported by pipeline to the Mongstad terminal. The dry gas is transported in Zeepipe II A and II B to Zeebrugge in Belgium. The oil from Troll B and Troll C is transported in the Troll Oil Pipelines I and II, respectively, to the oil terminal at Mongstad.
- Status
- More than two million reservoir metres have been drilled on Troll. Drilling of new oil production wells on Troll concluded altogether; however, the need for future oil wells will be considered regularly. Various measures have been implemented and are in the preparation phase to improve gas capacity and production, such as drilling of several new gas wells in the coming years. A new gas export solution from Troll B to the Kvitebjørn gas pipeline started operation in 2025.
Production by year
MONTHLY ROWS ADDED UP · NEWEST FIRST
| Year | Oil, mill Sm³ | Gas, bill Sm³ | NGL, mill Sm³ | Condensate, mill Sm³ | O.e., mill Sm³ | Water, mill Sm³ |
|---|---|---|---|---|---|---|
| 20268 MONTHS | 0.77 | 28.2 | 0.71 | 0 | 29.7 | 11.3 |
| 2025 | 1.46 | 41 | 1.09 | 0 | 43.6 | 17.9 |
| 2024 | 1.89 | 43.8 | 1.42 | 0 | 47.1 | 16.9 |
| 2023 | 2.34 | 37.5 | 1.32 | 0 | 41.1 | 16 |
| 2022 | 3.63 | 39.8 | 1.29 | 0 | 44.7 | 19.2 |
| 2021 | 4.07 | 37.4 | 1.37 | 0 | 42.8 | 16 |
| 2020 | 4.99 | 35.1 | 1.32 | 0 | 41.4 | 16.9 |
| 2019 | 6.26 | 31.6 | 1.2 | 0 | 39 | 17.7 |
| 2018 | 6.41 | 38.6 | 1.48 | 0 | 46.5 | 17.2 |
| 2017 | 7.24 | 36.7 | 1.47 | 0 | 45.5 | 18 |
| 2016 | 7.35 | 31.9 | 1.28 | 0 | 40.5 | 17.6 |
| 2015 | 7.01 | 34.6 | 1.34 | 0 | 43 | 18.3 |
| 2014 | 7.3 | 29 | 1.23 | 0 | 37.6 | 18.7 |
| 2013 | 7.1 | 29.6 | 1.23 | 0 | 38 | 17.8 |
| 2012 | 7.1 | 34.4 | 1.41 | 0 | 42.9 | 19 |
| 2011 | 7.26 | 24.8 | 0.93 | 0 | 33 | 19.8 |
| 2010 | 6.87 | 28.6 | 1.07 | 0 | 36.5 | 20 |
| 2009 | 7.85 | 24.4 | 1.07 | 0 | 33.3 | 21 |
| 2008 | 8.17 | 29.7 | 1.07 | 0 | 39 | 21.5 |
| 2007 | 9.43 | 35.8 | 1.37 | 0 | 46.6 | 21.7 |
| 2006 | 10.8 | 30.7 | 1.4 | 0 | 42.9 | 21.3 |
| 2005 | 14.1 | 28.3 | 1.31 | 0 | 43.7 | 22.6 |
| 2004 | 17.8 | 26.4 | 0.28 | 0.45 | 44.9 | 23.6 |
| 2003 | 20.8 | 26.2 | 0 | 1.51 | 48.5 | 21.9 |
| 2002 | 21.2 | 25.6 | 0 | 0.77 | 47.5 | 18.9 |
| 2001 | 19.5 | 21.4 | 0 | 0.64 | 41.6 | 18.5 |
| 2000 | 18.4 | 24.7 | 0 | 0.75 | 43.8 | 15.8 |
| 1999 | 12.9 | 25.5 | 0 | 0.22 | 38.6 | 0 |
| 1998 | 13.3 | 20 | 0 | 0 | 33.2 | 0 |
| 1997 | 14.8 | 14.3 | 0 | 0 | 29.1 | 0 |
| 1996 | 13.3 | 5.51 | 0 | 0 | 18.8 | 0 |
| 1995 | 2.86 | 0 | 0 | 0 | 2.86 | 0 |
| 1994 | 0.06 | 0 | 0 | 0 | 0.06 | 0 |
| 1993 | 0.06 | 0 | 0 | 0 | 0.06 | 0 |
| 1992 | 0.06 | 0 | 0 | 0 | 0.06 | 0 |
| 1991 | 0.18 | 0 | 0 | 0 | 0.18 | 0 |
| 1990 | 1.05 | 0 | 0 | 0 | 1.05 | 0 |
Wellbores
Production 692 · Observation 76 · Appraisal 46 · Injection 6 · Wildcat 4 · Shallow gas 2 · Unknown 2 · Soil drilling 1 · Unstated 1
All 830 wellbores in Troll, searchable → · Discovery wellbore 31/2-1 →
Operator history
- Equinor Energy ASMay 16, 2018 to today
- Statoil Petroleum ASNov 1, 2009 to May 15, 2018
- StatoilHydro Petroleum ASJan 1, 2009 to Oct 31, 2009
- StatoilHydro Petroleum ASOct 1, 2007 to Dec 31, 2008
- StatoilHydro ASAOct 1, 2007 to Dec 31, 2008
- Norsk Hydro Petroleum ASJan 1, 2007 to Sep 30, 2007
- Statoil ASA (old)May 10, 2001 to Sep 30, 2007
- Den norske stats oljeselskap a.sJun 19, 1996 to May 10, 2001
- Norsk Hydro Produksjon ASMay 18, 1992 to Dec 31, 2006
- A/S Norske ShellDec 15, 1986 to Jun 19, 1996
This field on Sodir FactPages →
About this data
Norwegian Offshore Directorate (Sodir) FactPages, mirrored nightly and used under the Norwegian Licence for Open Government Data (NLOD). Production is saleable volume by month from the Directorate's profiles, cut at the latest month any field has reported; yearly and cumulative figures are those months added up. Shares are the current rows of the field's licensee history. Reserves are the Directorate's estimate.
Developers: this page as JSON is GET /v1/data/norway/fields/46437, documented in the API reference.