Talks are being held with Wood Group and Bilfinger Industrial Services staff working at the Sullom Voe Terminal in Shetland over the future of up to more than 200 positions.
Wood Group is in discussions regarding around 90 positions at the BP-operated terminal following a review of its personnel requirements brought on by changes being made to work on the site.
Meanwhile Bilfinger Industrial Services said it had also initiated consultation due to changes in seasonal workloads and winter working conditions.
A spokesman said:“Unfortunately, this may result in a number of roles being made redundant.
“We are continuing to work closely with trade unions during discussions and effort is being made to find alternative solutions where possible.
“As consultations are ongoing it would be inappropriate for us to comment further at this stage.”
Shetland MSP Tavish Scott is expected to raise the issue with Nicola Sturgeon at First Minister’s Questions today.
He said: “This is a worrying development especially for the employees who will be directly affected.
“Sullom Voe Terminal is a major employer in Shetland and its continuing future is very important for the local economy. I will be asking BP to clarify what changes are taking place at SVT that has triggered this announcement.”
A BP spokesman said the terminal typically experienced reduced activity due to the adverse winter weather when “many activities cannot be efficiently executed”.
He said: “That, coupled with the work we are doing to ensure a competitive business for the future, has led to changes in some work scopes on site.
“SVT continues to deliver a programme of critical maintenance and renewal activity and we are currently planning our programme of work for 2016.”
Earlier this week Aker Solutions confirmed it would be making a further 75 redundancies from the company in Aberdeen.