Petrobras has achieved first oil with the Floating Production Storage and Offloading (FPSO) unit Marechal Duque de Caxias, one of the largest ultra-deepwater FPSOs in the world, installed at the Mero field in Santos Basin, offshore Brazil.The FPSO has the capacity to produce up to 180,000 barrels of oil per day and compress up to 12 million cubic meters of gas daily.