A consortium made up of Italy's Eni, California-based Occidental Petroleum Corp. and Korea Gas Corp. signed a final deal in Baghdad on Friday to develop the Zubair oil field in southern Iraq. The deal is one of several that IraqÔÇÖs government hopes will transform it into a major global oil producer. The consortium plans to invest approximately $20 billion into Zubair over the life of the 20-year contract, which has the potential to be extended to 25 years.