As a wildfire rages across Alberta’s oil-sands region, pipelines, tanks full of chemicals, buildings and equipment are more at risk than the thick, tar-like deposits that are mined from the ground. The fire neared the gate of Cnooc Ltd.’s Long Lake oil sands plant in northern Alberta Friday. While officials were hopeful that winds would push the flames away to the northeast, many oil companies also have fire crews preparing to defend their complexes, Chad Morrison, the province’s wildfire compliance and investigations manager, said during a conference call. “They’re highly trained and have great emergency response plans in place for that.” The mines are cleared of vegetation so it’s unlikely the flames could reach any deposits. And burning oil-sands creates a hard, coal-like residue on the rock called coke, which prevents fire from reaching deeper into a seam, said Rick Chalaturnyk, an engineering professor at the University of Alberta. […]