Canadian crude weakened after two critical oil pipelines remained partially shut amid an investigation into a possible leak in Missouri. (Bloomberg) — Canadian crude weakened after two critical oil pipelines remained partially shut amid an investigation into a possible leak in Missouri. Heavy Western Canadian Select for March traded at $10.30 below the calendar average for West Texas Intermediate crude futures, compared with a $9.40 discount earlier Thursday, according to data from Net Energy Exchange. Prices weakened as shutdowns of TransCanada Corp.’s Keystone pipeline and Enbridge Inc.’s Platte line on Wednesday dragged on and threatened a pile-up of crude in Alberta. The disruption comes as refiners seek alternative supplies of heavy crude on the U.S. Gulf Coast after sanctions on Venezuela effectively cut access to the country’s oil. Canada’s oil-sands crude serves as a similar substitute, but Alberta has struggled with pipeline bottlenecks that have forced rationing on export […]