Want to buy an oil well in U.K.’s North Sea? There are plenty available as some of the industry’s largest names try to sell aging, costly wells that have become even less profitable with the plunge in crude prices. BG Group Plc, Apache Corp. and Marathon Oil Corp. are among companies that have explored a sale of their North Sea assets, according to people familiar with the processes. In all, assets worth as much as 20 billion pounds ($30 billion) are currently for sale in the North Sea, said Dave Blackwood, senior adviser to investment bank Evercore Partners Inc. Drillers have struggled in recent years to extract oil from the North Sea’s depleting fields, leading to reduced output and costs that jumped 26 percent last year. Oil has slumped about 36 percent since the Organization of Petroleum Exporting Countries’ Nov. 27 accord to maintain production at 30 […]