Statoil: Troll Under Pressure

By Eric Haun
Thursday, June 05, 2014
The compressor module was lifted into place by Saipem 7000, one of the world's largest heavy lift vessels.

On June 4, two new compressors were lifted aboard the Troll A platform in the North Sea, Statoil reported. Once the compressors are up and running next year, they will boost recovery from Troll by more than 83 billion standard cubic meters of gas.

As gas is produced on the Troll field, pressure in the reservoir drops. Pressure on the platform is lowered to help the gas move up, and compressors are used to keep it moving.

Vast volumes
Troll already has two compressors, which will now be joined by compressor numbers three and four. These two compressors will boost recovery from the giant field by 83 billion standard cubic meters of gas - 522 million barrels of oil equivalent, Statoil explained. That’s more than Aasta Hansteen and Valemon put together.

The compressor module was built at Aibel's yard in Thailand, and following a short stop in Haugesund, it is now in place on Troll A.

“The new module was lifted into place in a safe and sound manner. This has been planned for a long time, and it is therefore positive that we have reached this milestone, which is important for Troll A's gas deliveries over the next 50 years. Installing new modules weighing a total of more than 6,000 metric tons on an existing platform in operation is a huge task,” said Knut Solemslie, production manager on Troll A.

The project will ensure a daily export capacity of 120 million standard cubic meters of gas and annual production of 30 billion standard cubic meters.

“This is equivalent to the consumption of more than 10 million European households. The project is therefore an important contributor to the European gas market. It will also be possible to extract the gas more quickly, while also increasing the technical lifetime of Troll A,” said Tone Kristin Børslid, asset owner representative for the project.

Statoil currently has high pressure on low pressure. In all, the new compressors on Troll, Kvitebjørn, Åsgard, Kristin and Heidrun will contribute more than 1.2 billion barrels of additional oil equivalent. A giant field in itself, just from enhanced recovery.

Global project
The project consists of three different modules. Aibel, the main supplier for the Troll compressor project, built one module in Thailand and two in Haugesund.

Last summer, the EIT module (electrical, instrument and telecom) from Haugesund was lifted on board Troll. The two next modules will be installed this summer.

Yet another module will be lifted on board a few weeks later. The IUM module (integrated utility module) was prefabricated in Poland and assembled in Haugesund, where the equipment was also installed. It weighs 1,800 metric tons.

Powerful power measures
The two new compressors on Troll A will be supplied with power from shore, more specifically from Kollsnes in Hordaland county, Norway. The two compressors can deliver an output of 50 megawatts each when in maximum operation mode.

Statoil has been granted a license for this and the power grid has been reinforced in order to deliver the power needed by the compressors.

While the compressor module was en route from Thailand, power cables were laid from Troll A to shore. Five cables, each totaling about 70 kilometers, were laid between Kollsnes and the platform. Four of these cables are direct current (DC) and were installed in pairs.

“A transformer station has been constructed at Kollsnes which converts alternating current into direct current to reduce energy loss when the electricity is transported over long distances. On Troll A, the direct current is converted back into alternating current,” says marine installation manager Tom R. Guttormsen.

The final cable is an alternating current cable with fiber optics which will back up existing power deliveries to the platform, and will also provide the possibility of additional signal transmission between Kollsnes and Troll A.

The first cable was connected to the Troll A platform on April 21. The installation of cables toward shore began afterwards. The work is carried out under an ABB contract with the Lewek Connector vessel, which is operated by EMAS. Lewek Connector is one of the largest and most modern cable installation vessels in the world.

  • M11 sails out from Thailand, on its way toward Haugesund and the North Sea. (Photo: Helge Navratil/Statoil)

    M11 sails out from Thailand, on its way toward Haugesund and the North Sea. (Photo: Helge Navratil/Statoil)

  • The first cable is prepared on board Lewek Connector. (Photo: Tom Reidar Guttormsen/Statoil)

    The first cable is prepared on board Lewek Connector. (Photo: Tom Reidar Guttormsen/Statoil)

  • M11 before departure. (Photo:Aibel)

    M11 before departure. (Photo:Aibel)

  • M11 sails out from Thailand, on its way toward Haugesund and the North Sea. (Photo: Helge Navratil/Statoil)
  • The first cable is prepared on board Lewek Connector. (Photo: Tom Reidar Guttormsen/Statoil)
  • M11 before departure. (Photo:Aibel)

Maritime Today

The Maritime Industry's original and most viewed E-News Service

Maritime Reporter April 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

Jensen Debuts New Tractor Tug Design

Crowley Maritime Corp.’s Seattle-based naval architecture and engineering firm, Jensen Maritime, reports it has designed a new tractor tug for Vessel Chartering

Elandra Yachts Expands, Launches Finishing Department

Elandra Yachts has added another layer of craftsmanship to its boat-building operation with the launch of a new in-house paint department at the Gold Coast plant,

Smulders Appointed CEO of Radio Holland

Paul Smulders has been appointed CEO of Radio Holland, part of the RH Marine Group (formerly Imtech Marine).   Smulders returns to Radio Holland where he started


Crowley to Christen 3rd LNG-ready Product Tanker

Crowley Maritime Corp. announced it will hold a christening ceremony Thursday, May 5 in New Orleans for the newly built Louisiana, the company’s third of four new Jones Act product tankers.

Venezuelan Crude Sales to US Fell 8% in April

Venezuelan crude sales to the United States declined 8.3 percent in April to 734,700 barrels per day (bpd) compared with the same month of 2015, amid delays at PDVSA's main ports,

Bureau Veritas Acquires TMC Marine

Bureau Veritas has acquired international consultancy TMC Marine Ltd.    TMC has provided pre- and post-casualty advice and support to the marine industry since 1979.

Offshore Energy

Skandi Paraty Delivered and On-hire

Skandi Paraty, owned by Norskan Offshore Ltda, has been delivered from the yard and went on-hire on a four years contract with Petrobras.   Skandi Paraty is an AHTS,

ABB Transformers for the Most Powerful Wind Turbines

ABB will deploy 40 special transformers to equip wind turbines for an offshore wind farm in the Irish Sea. The MHI Vestas Offshore Wind turbines are 195 m (640

Wind-powered Oil Recovery Project Green-lighted

The DNV GL-led WIN WIN Joint Industry Project (JIP), which melds offshore wind with offshore oil and gas, shows that for suitable fields,finds that  wind-powered

Maritime Security Naval Architecture Navigation Offshore Oil Pipelines Ship Electronics Ship Repair Ship Simulators Sonar Winch
rss | archive | history | articles | privacy | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1526 sec (7 req/sec)