Trestakk comes onstream offshore Norway, under budget

Trestakk field layout.
Trestakk field layout.

Offshore staff

STAVANGER, Norway – Production has started from the Trestakk field on Haltenbanken in the Norwegian Sea.

The field has estimated recoverable resources of 76 MMbbl of oil, according to operator Equinor. Production started on time, below budget, and without any serious incidents.

The field has been developed via a subsea template with four well slots and one satellite well. The semisubmersible Songa Enabler will drill five wells: three for production and two for gas injection. Trestakk is tied back to the Åsgard A floating production vessel, which has been modified to receive the production from the field.

Peak production is expected to be about 44,000 b/d of oil. Equinor said the field is expected to produce for 12 years.

The Trestakk template and satellite were constructed by Aibel in Haugesund, while TechnipFMC had overall responsibility for the subsea equipment, pipelines and installation.

Discovered in 1986, Trestakk is about 20 km (12 mi) south of the Åsgard field in about 300 m (984 ft) water depth.

According to Equinor, when the project was approved by the authorities in 2017, the investments were estimated at NOK5.5 billion ($642 million). On field start-up the final costs are expected to be NOK5 billion ($584 million).

Trestakk licensees are Equinor Energy AS (operator, 59.1%), ExxonMobil Exploration and Production Norway AS (33%), and Vår Energi AS (7.9%).

The original life time of the Åsgard A was 2019, however, last winter the Petroleum Safety Authority Norway and the Norwegian Petroleum Directorate approved the application for extending the life time of the installation to 2031.

Arne Sigve Nylund, executive vice president for Development and Production Norway, Equinor, said: “The Trestakk volumes are important for us to maintain profitable operation of Åsgard A and to recover more of the original Åsgard volumes.

“Our draft for development of the Norwegian continental shelf points to the need for new reserves, and this is the kind of projects we would like to see many more of in the years to come.”


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