The Health and Safety Executive (HSE) has issued an improvement notice to North Sea operator Apache over its failure to properly maintain supports to the flaring system on its Beryl hub.
More than 300 offshore workers have voted for strikes across 20 North Sea installations, Unite the Union has announced, causing "major problems" for production.
UK offshore exploration drilling is on course to slump this year to its lowest level since companies starting scouring the North Sea for oil in the mid-1960s.
Private-equity back oil firm Chrysaor has snapped up stakes in a number of UK North Sea licences containing exploration prospects from US business Apache.
Apache today said it had managed a 100% drilling success rate in the North Sea while adding production from three development wells in the region during the second quarter.
The Houston-headquartered firm, which also has operations in Canada, Egypt and the US, said the trio had achieved a 30-day average rate of more than 6,000 barrels of oil equivalent (boe) a daily.
Drilling has also started on the Storr play in the Beryl area, the company said in its second quarter results announcement, which revealed net losses of $244million (£185million).