Consultant will determine financial feasibility of investment program to transport crude through the Norperuano pipeline.
New players will come into Brazil's downstream business and create competition and possibly also changes in the country's commercial policies, according to a Petrobras executive.
The aim is to boost production, bringing in new short-term investments.
Colombians will choose a successor to President Juan Manuel Santos on May 27, with a runoff vote scheduled for June 17.
The companies submitted 12 bids for the oil areas that Argentina's Mendoza province is tendering.
The fourth production-sharing bidding round will offer four blocks in the deep waters of the Santos and Campos basins.