Shale oil producers in the southern United States could take at least two weeks to restart the more than 2 million barrels per day (bpd) of crude output that shut down because of cold weather, as frozen pipes and power supply interruptions slow their recovery, sources said. Brent crude was up $1.06, or 1.6%, at $65.30 a barrel by 0204 GMT, after earlier hitting a high of $66.38. U.S. crude rose 81 cents, or 1.4%, to $62.51 a barrel, after hitting a session high of $62.73. Both benchmarks have risen more than 1% after climbing nearly 4% in the previous session. “The positive momentum continues in the oil complex, with investors unabashedly predisposed to a bullish view,” said Stephen Innes, chief global markets strategist at Axi in a note.