Net income grew to 47.3 million reais ($23.9 million) in the three months to December.
Annual profits were down 10.5% from 2011 to 82.5 million reais.
Production at Manati grew to 252.6 million cubic feet of natural gas for the quarter and 1.01 billion cubic feet for the year, a nearly 50% annual gain.
But the company did expect production to average between 5.5