PRODUCTION FROM THE FIELD
Source: The Norwegian Petroleum Directorate
ReservoirTroll 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 1,330 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 1,360 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 only 2 to 4 metres thickness. A significant volume of residual oil is encountered directly below the Troll Vest oil column. There is a minor oil discovery in the Middle Jurassic Brent Group, below the main oil reservoir.
RecoveryThe 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 to increase oil production. Produced water was reinjected into the northern part of the Troll Vest oil province from 2000 to 2016.
StatusThere are currently three drilling rigs on the field, continuously drilling horizontal oil production wells from the subsea templates on Troll Vest. About 180 production wells and more than one million reservoir metres have been drilled so far. Technology development has resulted in through-Xmas tree drilling with two branches since summer 2017. A new gas compressor module started operation on Troll B in late 2018, and has increased gas processing capacity and total recoverable reserves. Another gas compressor module will be installed on Troll C, with start-up in early 2020. Both the Troll field and the tied-in field Fram will benefit from the module. Troll Phase III is under development and expected to come on stream in 2021.
TransportThe 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.
DevelopmentTroll 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. 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 facility 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 facility, and Troll C, a semi-submersible accommodation and production steel facility. The oil is produced from several subsea templates tied-back to Troll B and Troll C by pipelines. Production from Troll C started in 1999. The Troll C facility is also utilised for production from the Fram field. Several PDO amendments were approved in connection with various subsea templates at Troll Vest. The latest PDO amendment was approved in December 2018 for the Troll Phase III development: gas blowdown in Troll Vest.
ACCRUED INVESTMENTS IN NOMINAL NOK
Source: The Norwegian Petroleum Directorate
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