Two years ago Canadian oil sands producer Cenovus Energy Inc., CVE -2.54 % buoyed by success at its flagship project and eager to cut operating expenses, halved the amount of instrumentation used to measure finicky temperature and pressure at its wells. But that turned out to be a costly mistake that cut into its Foster Creek site’s production volumes, which only have recently recovered after the company reversed course. “We started to cut our operating costs, but in hindsight that’s a lesson learned,” Harbir Chhina, Cenovus’ executive vice president in charge of oil sands, said in an interview. “If I compare the oil sands to a baseball game, I think we just finished the first inning,” he said. Of the roughly two million barrels a day that Canada currently produces from its oil sands, about half is mined from the surface using giant excavators and the world’s tallest dump […]