UK North Sea services workers downed their tools for 48-hours on Thursday after failing to reach a deal with Wood Group.
Members of Unite the union and RMT begun the strike to protest proposed pay cuts that they say will decrease pay by 30 percent when cuts to allowances are included.
Wood Group has denied proposing a 30 percent pay cut.
The strike is expected to affect Shell’s Alpha, Bravo, Charlie, Nelson, Gannet, Shearwater and Curlew platforms.
Shell told Reuters that the Nelson and Shearwater are currently on outage for planned maintenance that is not related to the industrial action.
A company spokesperson added that changes in work schedules have allowed striking workers to be replaced with other workers.
The maintenance is expected to last until next week.
Shell told Platts that the strike is not expected to impact production at the platforms.
The unions said that they offered to suspend the strike during “last-minute meetings this week” if Wood Group “agreed to remove their current proposal in full to allow for further consultation and negotiation.”
The unions said Wood Group “refused” that offer.
“We are extremely disappointed that Wood Group has decided to continue its attack on the pay and allowances of offshore workers. We repeat our call for proper consultation and negotiation,” Unite regional officer John Boland said.
The work stoppage comes about a week after the unions conducted a 24 hour work stoppage that marked the region’s first strike in 28 years.
Production at the platforms was not impacted by the previous work stoppage.