North Sea workers will vote on strike action after rejecting a revised pay offer earlier this year.
Crew are holding out for a 4% increase in basic pay from companies who are members of the Offshore Contractors Association (OCA).
In July, the Unite trade union said its members had snubbed the offer of a 3.3% raise for the eight months to March 31, 2019.
The proposals also included a 2.5% pay increase for the 2019-20 financial year, but were turned down by 68% of those polled.
Unite said today that the industrial action ballot would open on September 28 and run until November 2.