"Work is underway to put out flames in the remaining wells or oil spots that Daesh criminal gangs set ablaze before fleeing the city," deputy oil minister Fayadh al-Nema said in the statement.
Islamic State is also known as Daesh.
Nema did not say how many fires were still ablaze.
The Qayyara region produces heavy sour crude and has a small refinery to process some of the oil.
