Brazil's Petrobras estimates it will save costs for 18,000 million dollars between 2015 and 2021 findings with direct contracting to explore four oil surplus subsalt areas of the country, the company said Friday . The company expects investment required would be for about 26,000 million dollars to acquire areas, discover and define the potential surplus oil, according to a filing with the Securities and Exchange Commission (CVM). The presentation was used this afternoon by the president of Petrobras, Maria das Graças Foster, in a meeting with analysts at the headquarters of the state company in Rio de Janeiro. On Tuesday, the National Energy Policy Council (CNPE) Petrobras chose to remove…