Unions will stage a 48-hour strike next week as industrial action continues on seven Shell assets in the North sea.
Both RMT and Unite members voted in support of action for the first time in more than a generation.
Around 400 workers are taking part in a continuous overtime ban, while tools were also downed on Tuesday this week, followed by two three hour stoppages yesterday.
Wood Group is currently making changes to is contracts with workers on Shell installations after renewing its contract with the oil major earlier this week.
Staff say the changes will impact heavily on their income.
The Offshore Contractors Association (OCA) earlier this week called for representatives from both sides to get back around the negotiating table.
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