Troll Oil And Gas Field

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Summary Information

  • Operator: Statoil
  • Country: Norway
  • Location: The Troll field is located in the northern part of the North Sea, approximately 65 kilometres west of Kollsnes, near Bergen in Norway
  • Production start: 1995
  • Partners:
    • Petoro 56 %
    • Statoil 30.58 %
    • Norske Shell 8.10 %
    • Total E&P Norge 3.69 %
    • ConocoPhillips Skandinavia 1.62 %
  • Type: Troll Blend Crude Oil & Gas
  • Estimated Reserves:
    • Original -
      • 1410.9 billion Sm³ gas
      • 27.7 million tonnes NGL
      • 1.6 million Sm³ condensate -
    • Remaining as of 31.12.2011
      • 1019.1 billion Sm³ gas
      • 22.2 million tonnes NGL
  • Production Volume: 250,000 bpd


  • The field contains 40 per cent of the total gas reserves on the Norwegian continental shelf and is also one of the largest oil fields on the continental shelf.
  • The Troll field is the world's biggest subsea development with regards to the number of subsea wells.
    • The Troll A concrete deepwater structure is the world’s largest natural gas production platform at 473 meters tall and weighing 1.2 million tons.
    • It is also the tallest structure ever to be moved by mankind.
  • At peak production the field produced 400,000 bpd
  • Gas is delivered to Belgium via the Zeepipe Gas Pipeline after processing at the Kollsnes Gas Processing Plant in Norway
  • Troll B, a floating process and accommodation platform with concrete hull, and Troll C, a floating process and accommodation platform with a steel hull, produce from thin oil-bearing layers in the Troll West reservoir.
  • The oil is transported to Mongstad, from Troll B through the Troll Oil Pipeline I (completed 1995; 16" diameter, 85 km length, transport capacity 42,500 m3/day), and from Troll C through the Troll Pipeline II (completed 1999; 20" diameter, 80 km length, transport capacity 40,000 m3/day).
  • Associated gas goes to Troll A.


  • GE Oil & Gas: Designed, built and installed the original Troll B subsea production system
  • Aker Solutions:
    • Six subsea trees and a tool package
    • 38 kilometres of umbilicals
  • Hyundai Heavy Industries: Construction of Troll C floating platform
  • Emtunga:
    • Troll A - Pre-engineering, Pre-compression Power Transformer Modules
    • Troll A - Additional accommodation
  • Saipem:
    • Transport and Installation of Pipelines for Troll Oljie & Troll Phase II projects
  • Aibel:
    • Area preparation, installation and integration of new living quarters modules for Troll A platform
    • Study contract for conceptual development of the Troll A 3rd & 4th compressor trains
    • Upgrading the Troll A-platform with a new compression module, utility module and in addition a new electro module for receiving electricity from ashore
  • ABB:
    • Engineering, procurement, construction and installation offshore of a 4000-ton gas compression module
    • Supply of an offshore power transmission system
    • Electric drive system for two pre-compression units for Troll A
    • Two high-voltage direct current (HVDC) power transmission systems, including HVDC converters and subsea direct current cables to provide reliable power to the offshore equipment from the shore
  • Jotun: Painting Troll A - Jacket, Deck, Heli-deck, Topside


  • 1979 - Troll Oil And Gas Field discovered
  • 1983 - Troll declared commercial
  • 1986 - Norske Shell was responsible for the first gas development phase on Troll, which received a green light from the Norwegian parliament.
  • 1995 - Troll B entered production
  • 1996 - Statoil took over as operator for Troll Gas from Norske Shell
  • 1996 - Contractual gas deliveries began flowing from the field to continental Europe under the Troll gas sales agreements via the Zeepipe Gas Pipeline
  • 1999 - Troll C Platform commissioned
  • 2002 - ABB win contract for power system and compression module
  • 2008 - Aibel wins a contract for new living quarters modules for Troll A platform
  • 2012 - Temporary shutdown of Troll C
  • 2014 - Compression modules added to Troll A


  • The gas and oil reservoirs in the Troll Øst and Troll Vest structures consist primarily of shallow marine sandstones belonging to the Sognefjord Formation of Late Jurassic age. Part of the reservoir is also in the Fensfjord Formation below the Sognefjord Formation. The field consists of three relatively large rotated fault blocks. The fault block to the east constitutes Troll Øst. The reservoir depth at Troll Øst is about 1 330 metres. Pressure communication between Troll Øst and Troll Vest has been proven. Previously, 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.


  1. The Troll area, Statoil
  2. Troll, NPD
  3. Hyundai Heavy Industries FPSO References
  4. Aker Solutions Umbilical References
  5. Jotun Platform References
  6. Emtunga Offshore Platform References
  7. Saipem Europe Pipeline References
  8. ABB signs US$ 230 million in contracts with Statoil
  9. Aibel secures StatoilHydro contract worth USD 180M
  10. Aibel AS awarded contract by StatoilHydro for studies for conceptual development of Troll A 3rd & 4th compressor trains
  11. Aibel won contract worth billions at Troll A
  12. ABB wins $270 million order from Statoil for world’s largest offshore gas platform
  13. Aker Solutions awarded Troll contract
  14. Ezra wins cable installation contract from ABB for world’s largest gas platform
  15. Temporary shutdown on Troll C
  16. Statoil Selects GE Oil & Gas for Troll B Subsea Production Control System Upgrade
  17. Troll under pressure
  18. Troll oil for 20 years
  19. ABB completes Troll A platform’s second power-from-shore system
  20. More gas from Troll A

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