Project Profile
Value: US$8,000 million
Location: blocks 31/2, 31/3, 31/5 and 31/6, about 65km west of Kollsnes, near Bergen, Norwegian part of the North Sea, Norway
Production: 30 BCM/yr
Reserves: 1.8 trillion cubic metres of natural gas and two billion barrels of oil
Depth: 315-345 m
Start-up Year: 3Q 2018
The partners in the Troll field are considering a third development phase that could increase its production by five to 10 billion cubic metres of natural gas per year. The field as a whole consists of the main Troll East and Troll West structures in blocks 31/2, 31/3, 31/5 and 31/6, about 65km west of Kollsnes, near Bergen, in water depths of 315-345m. Most of the gas lies in Troll East. The production could be increased by even more than 10 BCM/yr. The Troll field is estimated to hold around 60% of the total gas reserves on the Norwegian Continental Shelf and currently produces around 30 BCM/yr. The development may take in the Gjoa, Camilla, Belinda, Fram B and Astero discoveries north of Troll. The main aim of the joint project is the study of how and when to produce the gas cap in Troll West. TFD is expected to encompass a number of elements: the implementation of several types of enhanced oil recovery (EOR) techniques; altering the operating conditions in different areas of the field; the installation of new production facilities; and modifications of existing production units. The Troll partners’ plan has an investment limit of almost NOK 10 billion, and includes:
- A new gas injection plant for improved oil recovery on the Troll B platform;
- A new 35 inch rich gas pipeline from the Troll A platform to the Kollsnes gas plant, including modifications on Troll A and the Kollsnes terminal.
Replacement of production pipes in the gas wells running up to Troll A in the Troll East area. The diameter of the pipes will be increased, which results in lower pressure drop and increased production from the wells Gas injection in Troll West will increase the oil reserves at Troll by 17 million barrels. The offshore modifications are scheduled to start during 2008. The gas injection plant will be in place by the turn of the year 2010/2011. The new rich gas pipeline designed to maintain the daily gas production capacity will come on stream in 2011. The field is estimated to have recoverable resources of 1.8 trillion cubic metres of natural gas and two billion barrels of oil. Block 31/2 contains 32% of the Troll field’s reserves, while the remaining 68% lies in the three other blocks. Gas and oil from the field is extracted via three platforms – Troll A, B and C. The principal focus of gas production is Troll A, in Troll East (block 31/6). With an overall height of 472m it is the tallest structure ever moved by mankind, and is the only one of its type on the NCS that is powered electrically from land.
Operators:
Statoil: Operator with 30.6% interest
Petoro: 56% interest
Shell: 8.1% interest
Total: 3.7% interest
ConocoPhillips: 1.6% interest
Contractors:
ABB: Electric drive system, pre-studies, cable laying and installation of 350 kilometres of high voltage AC and DC cables, as well as project management and related engineering services
Aibel: Conceptual development of the third and fourth compressor trains and modules and modifications for two new pre-compressors on Troll A platform and FEED study into the installation of a new gas module on the Troll C platform
Aker Kvaerner: Modifications of the Troll C platform
Aker Solutions: Stell tube umbilicals, six subsea trees and well services
- delivery of a compression module whose purpose is to increase gas processing capacity on the Troll B platform to increase oil recovery. (September, 2016)
Allseas: P12 gas pipeline installation
Apply Leirvik: Accommodation module
Baker Hughes: Provide integrated drilling services
Bergen Group Rosenberg: Replacement of a compressor motor on the Troll A platform
China Oilfield Services Limited (COSL): Semisub
COSLPioneer: Drilling contract using semisubmersible COSL Promoter
FMC Technologies: Subsea well template and well heads
GE Oil & Gas:
-Supplying its fifth generation SemStar5 Subsea Electronics Module
- September 2015, GE Oil & Gas signed framework agreement with Statoil Petroleum AS to provide subsea operations services for the Company\'s operated fields Tordis, Vigdis, Snorre and Troll, located north west off the coast of Stavanger. GE Oil & Gas will run the services from their Dusavik site, providing subsea operations services, including offshore installation and intervention, equipment repair and maintenance, studies, upgrades and modifications. The frame agreement effective October 1st will ensure efficient cooperation between the two parties, with GE providing highly skilled and experienced personnel to enable safe and efficient execution and to ensure maximum uptime to support Statoil\'s production targets.
Subsea 7: Flexible flowlines and umbilicals
Transocean: Transocean Leader, an Aker H-4.2 semi-submersible drilling rig, to drill Troll oil and gas field
Ocean Installer: Amendments with Statoil for umbilical marine installation at the Visund field and for riser replacement at the Troll B field, both developments located in the North Sea.
Songa Offshore: Drilling contract using the Songa Equinox rig for a drilling campaign. The rig has arrived in Norway and is currently preparing for the Acknowledgement of Compliance (AoC) and the client’s Acceptance Test Plan (ATP). (November 2015)
Ocean Installer: Contract for riser replacement operations at the Troll C field. Additionally, this includes options for work at the Vigdis field. The work will be executed under the SLMP Marine Installation Contract. The work scope at Troll C includes recovery and installation of the oil export riser and two production risers. This work requires subsea and topside disconnection and removal of existing risers, and subsea tie-in and topside pull-in of new risers. Optional work includes flexible jumper replacement operations at the Vigdis field as well as other subsea operations (December 2015)
4Subsea: Contract extension of a framework agreement with Statoil covering 10 installations on the NCS. The contract started in 2012 and it has now been extended from June 2016 until June 2018. 4Subsea\'s scope of work has increased with one additional installation and will be covering the following Statoil installations on the Norwegian Continental Shelf: Statfjord C, Snorre A, Snorre B, Gullfaks A, Veslefrikk, Volve, Visund, Oseberg A, Troll B, Troll C and Norne. The contract also includes support to develop inspection and maintenance programs, failure investigations, systems for annulus vent gas monitoring AMOSTM, and repair solutions. (June 2016)
ALTUS Intervention (a subsidiary of Qinterra AS): a long-term frame agreement with Statoil for the delivery of mechanical wireline and fishing services, as well as cased hole logging and tractor conveyance as optional services. (July, 2016)
ProSep: contracted by Statoil to supply one ProDry™ unit to Statoil for the Troll B ZMP Project. (January, 2017)
DeepOcean: Engineering, procurement, fabrication and installation (EPCI) contract.
Kaefer: Insulation, scaffolding and surface treatment (ISO) service contract (December, 2017)
Sub Contractors:
EMAS AMC: Installation of subsea power cables
Grenland Group: Fabrication, assembly and testing of a subsea structure for FMC Technologies