Production was suspended on Statoil's Statfjord A platform in the North Sea on 28 May after a leak in the ballast water system.
This shut-down had a knock-on effect on Saga's Snorre field, which uses capacity on the A platform to process its oil and has therefore also gone off-stream.
Production from Statfjord is likely to resume next week, once damaged equipment has been replaced and the leak in a section of piping is dealt with.
A six-metre length of carbon steel piping and three flanges are currently being replaced in the 42-inch ballast-water riser to the platform.
This section of line also sprang a small leak last October, which was temporarily repaired. A major overhaul due in this year's turnaround has now been brought forward.
Once damaged equipment has been repaired or replaced, necessary inspections will need to be made before production can restart.
Statfjord C is also shut down at present for a planned turnaround which includes modification work to tie-in pipelines and pull in umbilicals for the Statfjord north flank development. The platform is due to resume production on 4 June.
Daily Statfjord production currently totals some 265,000 barrels of oil in normal operation, with the A platform contributing about 63,000 barrels.
Including output from Snorre, this installation processes around 180,000 barrels per day. Daily Statfjord C production comes to roughly 120,000 barrels.