Vidar Helgesen (Conservative Party of Norway), minister of European Economic Area (EEA) and EU affairs, has paid a visit to the Statoil-operated ‘Troll A’ platform, in the Troll field, located in the Norwegian part of the North Sea.
The reason behind the visit was the start-up of the two new giant compressors on the Troll A platform in October, Statoil said in a press release on Thursday. They will boost recovery from Troll by more than 83 billion standard cubic meters of gas.
During the visit, the minister Helgesen said: “Europe is in a transition phase with regard to both competitiveness and climate. Stable and competitive gas deliveries from the Norwegian continental shelf (NCS) play a key role along these two axes. Higher production and flexibility from the Troll field is therefore good news to both Norway and Europe.”
Gunnar Nakken, newly-appointed senior vice president for the operations west cluster, said: “This is a new strategic milestone for the Troll field. The compressors are an important investment to ensure sustainable, long-term production and activity on the Norwegian continental shelf (NCS).”
According to Statoil, the compressors ensure a daily export capacity from the Troll field of 120 million standard cubic metres of gas, totalling 30 billion standard cubic metres of gas per year. This is equivalent to the consumption of 10 million households in Europe, Statoil explains.
Production until 2063
The Norwegian oil and gas major says that the compressors are an important measure to meet the Troll field’s long-term production profile, currently extending to 2063. They are operated by land-based power from Kollsnes west of Bergen, ensuring zero emissions of carbon dioxide and nitrogen oxides from the platform.
“This is an important climate contribution from Statoil,” Nakken emphasises.
Nakken further said that during the past 18 months Statoil has started up low-pressure compressors on Troll A, Kvitebjørn, Heidrun, Kristin, Åsgard and Gullfaks, the last two on the seabed. As Nakken says, this increases the recovery rate by more than 1.2 billion barrels and extends the life of the installations. The project has extended the expected life of Troll A from 2045 to 2063, Nakken added.
“These investments in existing fields give highly profitable barrels. The field recovery increase the compressors provide, 83 billion standard cubic metres of gas or 533 million barrels of oil equivalent, is more than the Aasta Hansteen and Valemon fields combined,” says Nakken.
As the gas is being produced, Statoil explains, the pressure in the reservoir drops. In order to recover more gas, the pressure on the wellheads is reduced, and compressors help the gas on its way. Troll already has two compressors and will now have two more, Statoil says.
Five years in several countries
The Norwegian oil and gas company points out that the project has lasted for five years, and several countries took part in it.
The main supplier Aibel built the compressor module at its yard in Thailand, the integrated utility (IU) module was prefabricated in Poland and assembled in Haugesund, where the smallest module was also built. The three modules total more than 6,000 tonnes.
Five new 70-kilometre-long cables have been laid between Troll and land, and a converter station has been built at Kollsnes. On the platform the current is converted back into alternating current. The converters, cables and the compressors’ engines have been supplied by ABB.
130 people offshore, and a total of nine million hours
Torger Rød, Statoil’s head of projects, said: “It is a challenge to remove old equipment and install new equipment on a gas platform in production. In the peak period, the project had 130 people offshore, and a total of nine million hours have been spent on the project.”
“The project was delivered at just below NOK 10 billion ($1.22B), one billion below budget. This is due to good and close collaboration between all involved parties, including Statoil, our partners and suppliers,” says Rød.