The Troll field covers an area of 750 square kilometres in Norwegian North Sea blocks 31/2, 3, 5, and 6.
Containing 60 per cent of total gas reserves on the Norwegian continental shelf, it represents the very cornerstone of Norway’s offshore gas production.
Troll still ranks as the largest gas discovery in the North Sea. Located 1 400 metres beneath the seabed, its huge gas reserves are expected to permit production for at least 70 years.
Licence awards Block 31/2 was awarded under the fourth offshore licensing round in 1978. The following year, operator Norske Shell proved a large gas reservoir with an underlying oil zone.
This block was declared commercial in 1983, when the three neighbouring blocks – 31/3, 5 and 6 – were also awarded to Statoil, Norsk Hydro and Saga Petroleum.
While 32 per cent of Troll reserves are located in block 31/2, the other three blocks account for the remaining 68 per cent.
The licence terms for block 31/2 specified that Statoil could take over as operator for this acreage eight to 10 years after a discovery had been declared commercial.
In 1985, the two licences were unitised so that Troll could be developed as a single field.
Statoil took over as production operator for Troll Gas on 19 June 1996.
Processing on land Shell was responsible for the first gas development phase on Troll, which received a green light from the Storting (parliament) in December 1986.
Four years later, Statoil and Shell agreed to move the processing facilities originally due to be installed on the A platform to a plant on land at Kollsnes west of Bergen.
This made it possible to build a simpler offshore gas production installation than originally planned, with smaller staffing.
Troll A is the tallest structure ever moved by humans over the surface of the Earth. Its concrete support section has been built for a producing life of 70 years.
Contractual gas deliveries began flowing from the field to continental Europe under the Troll gas sales agreements on 1 October 1996.
Initial deliveries under these contracts, which began on 1 October 1993, were provided from Statoil’s Sleipner East development in the North Sea.
Oil Hydro is operator for the Troll Oil development in the western part of the field, which lies in block 31/2. This project came on stream in the autumn of 1995.
With an average daily output of more than 400 000 barrels, Troll ranked in 2002 as the largest oil producer on the Norwegian continental shelf.
This production is transported through two pipelines to the Mongstad crude oil terminal north of Bergen.
Hydro also won backing for a plan to inject Troll gas into its Oseberg field in the North Sea to help maintain reservoir pressure for oil production.
This Troll-Oseberg gas injection (Togi) project came on stream in 1991, and ceased production in 2002.
Facts:
The Troll field covers an area of 750 square kilometres in Norwegian North Sea blocks 31/2, 3, 5, and 6.
Containing 60 per cent of total gas reserves on the Norwegian continental shelf, it represents the very cornerstone of Norway’s offshore gas production.
Troll still ranks as the largest gas discovery in the North Sea.
Statoil took over as production operator for Troll Gas on 19 June 1996.
Hydro is operator for the Troll Oil development in the western part of the field, which lies in block 31/2.
Hydro also won backing for a plan to inject Troll gas into its Oseberg field in the North Sea to help maintain reservoir pressure for oil production.
This Troll-Oseberg gas injection (Togi) project came on stream in 1991, and ceased production in 2002.
Operator: Statoil ASA
Partners: Petoro AS 56.00 per cent Statoil ASA 20.80 per cent Norsk Hydro Produksjon AS 9.77 per cent A/S Norske Shell 8.10 per cent Total E&P Norge AS 3.69 per cent Norske ConocoPhillips AS 1.62 per cent
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