Oil gained a third week as investors focused on the ongoing production shut-ins in the US Gulf of Mexico as more refineries have resumed operations nearly two weeks after Hurricane Ida tore through the region. Futures in New York posted its longest set of weekly gains since July after ending Friday 2.3% higher. More than a million barrels a day of US offshore crude production remains shut in after Ida swept through the area nearly two weeks ago. Meanwhile, more Louisiana refineries are resumi ....