AASTA HANSTEEN GAS FIELD ON STREAM
On 16 December Equinor and its partners started production from the Aasta Hansteen gas field in the Norwegian Sea. Today, 17 December gas from the Aasta Hansteen field is available to the market for the first time and together with the Polarled pipeline the field opens a new region for gas export to Europe.
“Aasta Hansteen is a pioneer! Located in 1 300 metres of water, this is the deepest field development on the Norwegian continental shelf (NCS), the largest spar platform in the world, and a first on the NCS. The field now coming on stream is unique,” says Anders Opedal, Equinor’s executive vice president for Technology, Projects and Drilling.
Aasta Hansteen is located 300 kilometres west of Sandnessjøen, far from other fields and in an area with harsh weather conditions. The field has been named after another pioneer: Feminist, social commentator, painter and author Aasta Hansteen.
The field development concept consists of a floating platform with a vertical cylindrical substructure moored to the seabed (spar platform). 339 metres tall, the platform weighs 70 000 tonnes. When the platform was towed to the field in April, it was the biggest tow on the NCS since Troll A in 1995.
The gas is produced from seven wells in three subsea templates. This is the deepest ever installation of subsea equipment on the NCS.
Both Aasta Hansteen and the 482-kilometre pipeline from the field to Nyhamna has the capacity to accommodate new discoveries. The first one, Snefrid North, is already under development, and will come on stream towards the end of 2019.
The recoverable resources at Aasta Hansteen, including Snefrid North, are estimated at 55.6 billion standard cubic-metres (Sm3) of gas and 0.6 million Sm3 of condensate (353 million barrels of oil equivalent).
The exploration activity in the area around the field has already increased, and several discoveries have been made.
Although the substructure and topside structure were built in South Korea Aasta Hansteen has generated big spin-offs for Norwegian supply industry. More than half of the topside equipment packages were produced in Norway, and the subsea equipment is also Norwegian. The subsea templates were built in Sandnessjøen and the suction anchors keeping the gigantic platform in place are produced in Mo i Rana. The platform was hooked up at Stord south of Bergen, which is also where much of the hook up and commissioning work was performed.
Gas from Aasta Hansteen will be transported in the Polarled pipeline to the Nyhamna terminal (both operated by Gassco) for further export to the UK. Produced condensate will be loaded into tankers and transported to the market. Aasta Hansteen and Snefrid Nord is expected to produce some 23 million Sm3 of gas per (144 000 BOE) per day at plateau. (Source: Equinor – Image: Aasta Hansteen platform/Norskpetroleum)