Petrobras has brought the P-78 FPSO online at its Búzios 6 development, adding up to 180,000 barrels per day of oil capacity and reinforcing just how central the pre-salt has become to Brazil’s production story. The new unit is the seventh FPSO now operating at the Búzios field in the Santos Basin, lifting installed capacity at the field to roughly 1.15 million bpd. That matters because Búzios is no longer just a growth project. It is already one of the world’s largest producing oilfields, and it is still climbing.…