Reuters | Oil prices rise as turmoil in Nigeria adds to global supply disruptions Reuters SINGAPORE Oil prices rose in early trading on Friday as turmoil in Nigeria, shale bankruptcies in the United States and crisis in Venezuela all contributed to tightening supplies. Despite this, brimming inventories across the world were preventing ... April petroleum deliveries rise 3.6 pct, hit highest April levels in 8 years Oil slides on dollar strength and rising output Oil Hit by Stronger Dollar, Increase in US Crude Stocks |