Seven people were being treated at a nearby hospital for severe burns, while two suffered moderate burns. Others received treatment at an on-site clinic.
The company said the fire broke out at a gas liquefaction unit that had been out of service for maintenance work. It said the fire was extinguished and that operations at the refinery were not affected because the unit damaged was already out of service.
The refinery was built to handle 25,000 barrels of oil a day to supply Kuwait´s domestic market primarily with gasoline and diesel.
According to The Associated Press, the facility recently underwent an expansion to reduce its emissions and boost capacity to 346,000 barrels a day.
Kuwait, a nation home to 4.1 million people, has the world´s sixth-largest known oil reserves.
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