Related Links: PwC Report-Shale Gas: New conventions for unconventional development for the engineering and construction industry IEA World Energy Outlook 2013 Report The U.S. will become the world's biggest oil producer within two years, but rising global supplies of shale and other unconventional oils will not reduce the need for OPEC's oil over the next two decades, the Paris-based International Energy Agency said on Nov. 12.Non-OPEC oil production will rise to 52.9 million barrels per day (bpd) in 2035, up from 49.4 million bpd in 2012 but down from a peak of 55.1 million bpd in 2025, the IEA said