TransCanada Corp. (TRP) was working to restore gas deliveries to customers in Alberta after a pipeline rupture that caused at least four oil-sands producers to curb output, triggering a spike in Canadian oil prices . TransCanada’s North Central Corridor system resumed gas shipments to “most” customers after isolating a pipe break and was working with others to restore service, the Calgary-based company said yesterday. Imperial Oil Ltd. (IMO) ’s Kearl oil-sands project and Canadian Natural Resources Ltd. (CNQ) ’s Horizon upgrader halted output while the Syncrude upgrader stopped shipping product. Suncor Energy Inc. (SU) ’s Fort McMurray plant reduced rates. The drop in production from the plants, with a total capacity of as much as 920,000 barrels a day, sent Canadian crude prices higher yesterday, with Western Canada Select oil advancing $1.20 a barrel against the U.S. benchmark West Texas Intermediate and Syncrude gaining $1, according to data compiled […]