The North American headquarters of China National Offshore Oil Corp. said Tuesday it would cut about 13% of its workforce due to the slump in global oil prices , raising questions about terms of the Chinese state-owned company’s accord with the Canadian government. Cnooc said wholly-owned Canadian unit Nexen Energy ULC would reduce its 3,200-strong workforce by 400 jobs, including 340 in North America and 60 working for its British unit, to deal with falling revenue from a more than 50% drop in crude prices compared with mid-2014. It also said it would reorganize key business units and slow development on a new oil-sands project in northern Alberta. “In response to the recent industry downturn that has affected all companies in the energy sector, a decision was made to conduct a thorough review of our organization to ensure our long-term viability and sustainability,” Nexen Chief Executive Fang Zhi said. […]