Brazil's state oil company Petrobras  said on Monday an exploration well had reinforced estimates of the extent of the offshore Iara oil field, which it operates in partnership with BG Group  and Galp Energia.
The well, drilled 223 kilometers (139 miles) south of Rio de Janeiro, confirmed the presence of good quality crude measuring 21 degrees to 26 degrees on the American Petroleum Institute scale, Petrobras said in a securities filing.