A gas leak occurred on the Engie E&P-operated Gjoa field in the Norwegian sector of the North Sea last night.
Engie said the situation had been quickly brought under control and that no injuries had been reported.
The company said 49 people were on board when the leak was reported at 8:01pm on Wednesday.
Nineteen people were evacuated from the rig by helicopter and flown to a support centre in Floro.
Engie said in a statement: “The situation quickly came under control, and no injuries are reported.
“The gas leak has been stopped and the situation on board the Gjøa platform is under normalisation.
“Production is currently shut down.”