Oil giant Chevron is consulting with staff over changes to a three on, three off shift pattern.
The move is in line with a number of companies including EnQuest, Shell, Apache and Petrofac.
Unions have expressed concern over the potential changes suggesting they could risk the safety performance offshore.
It is understood staff were informed last month regarding the potential change.
A Chevron spokesman said: “In order to be competitive for the long term in the North Sea, Chevron is evaluating opportunities for improving efficiency and effectiveness in our offshore operations, including areas of logistics such as work rotas.
“No decisions have been made yet but as part of the process Chevron is committed to continued engagement with its employees and workforce representatives.
“Chevron remains focused on safe and reliable operations and progressing major capital projects.”
North Sea operator Enquest told staff it plans earlier this week to change the shift patterns of its offshore workforce as well as implement job cuts.
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