North Sea oil workers on three offshore platforms operated by French oil firm Total are being balloted on possible industrial action.
The UNITE union said its members on the Alwyn, Elgin and Dunbar installations are having pay and conditions reviewed.
The union said this includes proposals to change rotas.
A Total spokesman said a consultation process was under way with the workforce. The ballot closes on 28 June 2018.
19 Jun 2018
Pixie Energy is an incubator and a facilitator of strategic research and project work, focusing on energy regulation, policy and markets at the local and national level. Find out more about Pixie Energy