Fire broke out in one of the units of the Ruwais refinery which is owned by Abu Dhabi National Oil Company (ADNOC).
Abu Dhabi police and ADNOC said that specialised units put out the blaze.
ADNOC issued a statement on its Twitter account saying that the blaze left no human casualties and dismissed any direct threat to people living in the vicinity of the refinery.
A specialized team working with the Crisis Management Directorate coordinated the emergency situation with the Civil Defence in Abu Dhabi.
The Abu Dhabi – based company said that a thorough inquiry had been launched to investigate the cause of the fire.