Canada Pension Plan Investment Board has joined a group that’s in advanced talks to buy a package of Royal Dutch Shell Plc’s U.K. North Sea assets for $3 billion, people familiar with the matter said. Canada Pension has joined EIG Global Energy Partners and Chrysaor Holdings Ltd. to bid for the operations, said the people, who asked not to be identified because the matter is private. The sale is a key part of Shell’s plans to divest about $30 billion in assets through 2018 to help offset the $54 billion acquisition of BG Group, which increased debt and lowered its credit rating.