Oil and Natural Gas Corporation (ONGC) shares rose nearly 1% to extend their gains for the 4th straight day, tracking the rising trend in worldwide crude prices. Including the 4th session, ONGC shares are up over 4% in last 4 sessions, outperforming the Nifty, which remains unchanged. Crude oil prices have almost doubled since hitting decade lows in early months of 2016 as strong demand and supply disruptions erode a surplus that had pulled prices down by as much as 7