The fire on 26 December at platform P-20 affected the facility's chemical products system. About 22,000 barrels per day were affected.
Production was restarted around 10:30 am local time.
"With authorisation from the competent agencies, Petrobras has taken all steps necessary to normalise operations on P-20, according to the most rigorous health, safety and environmental standards," the company said late on Monday.
"Specialised