Shell said an incident had taken place on Monday evening about 130 miles south-east of Aberdeen.
There had been reports of “bubbling” on the sea surface, the Evening Express said.
The oil major added: “A release of gas was detected several hundred metres away from the FPSO at approximately 11pm.
“All personnel are safe and accounted for, but as a precaution we are preparing to carry out a down-man of non-essential personnel while we carry out further investigations."
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