Oil prices will 'grind higher' and don't expect a smooth ride: Citi's Kleinman By: CNBC.com News May 25, 2016 at 03:58 AM EDT Oil prices are likely to rise this year but it won't be a linear process, the head of European energy research at Citigroup said. Read More >> Related Stocks: Energy Select Sector SPDR US Brent Oil United States Oil Fund