Heavy Canadian crude slumped to its lowest level in at least a decade on Wednesday after Enbridge Inc closed two of its main pipelines in the United States because of a leak, piling fresh misery on Canadian oil companies that are close to producing at a loss. Western Canada Select heavy blend crude for September delivery last traded at $20.75 per barrel below the West Texas Intermediate benchmark, according to Shorcan Energy brokers, having settled at $19.80 per barrel below on Tuesday. Earlier in the session it hit $21.75 per barrel below WTI, the widest differential since August last year. That pushed the outright price of Canadian heavy crude to around $22.50 a barrel, a level at which some companies will struggle to cover the cost of production, blending and transportation. It was lower than the 2008 trough of $24.62, according to one […]