Two people were injured in a fire at one of Brazilian state-controlled oil giant Petrobras' offshore rigs, which was put out of service by the blaze, the company said.

The two injured employees are recovering well, Brazil's largest company said in a press release.

Output at the oil and natural gas storage and production platform, which produced 22,000 barrels of crude daily in November, will be halted for an undetermined period of time.

Petrobras said it was conducting an internal investigation to determine the causes of Thursday's accident.

A group of engineers, meanwhile, has been dispatched to the rig to try to repair it as quickly as possible and restart production, the release said, adding that all of the safety systems and procedures "worked as expected" during the accident and the platform's production capacity is "fully intact."

In a separate statement, the Sindipetro-NF oil workers' union said the blaze was of "great proportions" and that vessels especially equipped to fight fires at open sea had to be deployed.

Recurring accidents on giant offshore rigs operated by Petrobras, some resulting in deaths and, in one instance, the sinking of a platform, are due to the company's cost-cutting policy of using improperly trained employees of contractor companies. EFE