The Brazilian NOC's senior unsecured debt and corporate family rating was lifted to 'B1' from 'B2' and its baseline credit assessment rose to 'B2' from 'B3', the rating agency said on Monday.
Pipeline expansion will require approximately US$270mn of investment.
Chile's southernmost region seeks to capitalize on hydrocarbon, wind resources.
The northeastern Mexican state is expecting about US$32bn in investment, mainly thanks to projects and other business opportunities generated by the country's electric power and oil and gas auctions.
State refiner plans to add new storage at international airport in Guanacaste province.