Oil prices rose for the fourth straight week on expectations that production will soon plateau and amid uncertainty about Iranian nuclear negotiations. Light, sweet crude for May delivery settled up 85 cents, or 1.7%, to $51.64 a barrel Friday on the New York Mercantile Exchange. Prices rose 5.1% in the week. Brent, the global benchmark, rose $1.30, or 2.3%, to $57.87 a barrel on ICE Futures Europe, posting a 5.3% weekly gain. The moves capped a volatile week of trading, as investors continued to assess the global glut of oil that sent prices plunging in 2014. The market is currently oversupplied by between one and two million barrels of oil a day, analysts estimate, but many expect […]