Statoil has reportedly applied for an exclusion zone around its Njord field in Norway.
According to reports in Norwegian media, both the Njord A platform and Njord B storage vessel could be replaced.
Sources close to Statoil told publication TU that it the most likely case would be an upgrade on the platform, rather than a replacement.
According to documents seen by the publication, the Njord installations must be modified or replaced to recover remaining reserves in to process new discoveries in the area.
Statoil confirmed it had applied for an extended restriction zone around Njord for up to six years.
A spokesman said it was unlikely both installations would need to be replaced, but said production would be expected to resume by 2019 once it is shut off this summer.
He said the main desire for the Njord A was to upgrade and make it possible to operate the platform which could also operate with drilling activity.