Norwegian oil workers began wage talks on Tuesday, as they seek a new collective agreement and higher pay.
The talks come days after two unions that represent platform workers broke off negotiations, increasing the possibility of a strike.
Oil service employees, working for companies that include Schlumberger, Halliburton, Aker Solutions, and Baker Hughes, have Thursday night to reach a consensus.
If a deal is not reached, talks would go to a government mediator.
This year companies have sharply reduced spending plans, citing rapid wage growth in the industry.
Labour union Indusri Energi said in a statement, “If the sides can not reach agreement through negotiation, the dispute goes to mediation with the risk of strikes at the companies involved.”
Specific demands have not been released, but talks will include wages and overtime.