Troll Oil and Gas Field

Operator: Equinor
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 Refinery, 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.

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