Shell will make a decision by the end of the year on whether to change its offshore rotas, amid concerns about their effects on mental health.
A leaked report from a safety rep on the Shearwater platform earlier this year suggested the three weeks on, three weeks off (3/3) equal-time shift pattern was negatively affecting workers.
North Sea operators and contractors switched to 3/3 in a bid to lower costs amid the oil sector downturn.