Oil prices will stay at about $65 a barrel for at least half a year until OPEC changes its collective production or world economic growth revives, said the head of state-run Kuwait Petroleum Corp. Oil is trading in a bear market as the U.S. pumps at the fastest rate in more than three decades and demand expands more slowly. OPEC decided on Nov. 27 to maintain its output target, prompting a drop in European benchmark Brent crude to less than $70 a barrel for the first time since May 2010. “I think oil prices will stay around the current level of $65 for six or seven months until OPEC changes its production policy, or recovery in world economic growth become more clear, or a geopolitical tension arises,” Nizar Al-Adsani, KPC’s chief executive officer, said yesterday in Kuwait City . Crude prices have declined about 40 percent from a June […]