A consortium led by Singapore-based Keppel Shipyard Limited offered Brazil's Petrobras the lowest price to build a floating platform for Buzios, Latin America's second-largest oil field, three people close to the competition said.

Keppel offered to build P-78, a 180,000-barrels-per-day production unit that Petrobras plans for its deepwater Buzios field, for 12.52 billion reais ($2.33 billion), the sources said, asking not to be named as the information is confidential.

A winner has not been selected and the result is unclear, the sources said.

Petroleo Brasileiro SA, as Brazil's state-controlled producer is known, declined to comment. Keppel did not immediately respond to requests for comment.

The Singapore shipyard, which partnered with Hyundai Heavy Industries Holding Co Ltd and Brazil-based BrasFELS shipyard for the bid, beat two Asian competitors, sources said.

A consortium led by Daewoo Shipbuilding & Marine Engineering Co Ltd offered to build the P-78 platform for 14.11 billion reais ($2.63 billion). Samsung Heavy Industries Co Ltd placed the highest bid, 15.15 billion reais ($2.82 billion), the people said.

The competition marks Petrobras' comeback as a key customer for Asian shipyards, since Petrobras decided to regain ownership for part of its fleet after seven years only leasing.

Petrobras received offers on Feb. 1 for the construction of platforms P-78 and P-79, the company said on Tuesday.

($1 = 5.3644 reais)

 (Reporting by Sabrina Valle and Marta Nogueira; Editing by Brad Haynes and Marguerita Choy)

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