The planned strike action comes in response to an ongoing labour conflict at SLB UK, where a group of Industri Energi members have been on strike since March in a bid to secure a collective bargaining agreement, the union said.

If it goes ahead, the strike action at Archer will halt maintenance work at Ekofisk wells and also impact so-called well stimulation work at the field, which is operated by ConocoPhillips, Industri Energi added.

(Reporting by Terje Solsvik, editing by Gwladys Fouche)