The Canadian unit of Chinese state-controlled energy giant Cnooc Ltd. CEO 0.69 % said Wednesday it will halt production at a 50,000 barrel-a-day oil-sands plant indefinitely as part of its effort to comply with an order from regulators forcing it to shut down pipelines at the site. The move comes after the chief energy regulator in the Western Canadian province last week suspended operating licenses affecting 95 pipelines at Cnooc subsidiary Nexen Energy ULC’s Long Lake heavy oil extraction facility in northern Alberta for suspected failure to comply with certain rules . Shutting down Long Lake is the latest in a string of setbacks at the plant , which started up in 2008 but has never reached its capacity of 72,000 barrels a day. The loss of output is a blow to parent company Cnooc, which bought Nexen for $15 billion in 2013 and installed its own management […]