Bermuda, Dec. 16 -- Seadrill said it secured new contract awards and an extension across three rigs in the U.S. Gulf of Mexico and offshore Angola, adding roughly $48 million to its contract backlog through a follow-on program for the West Neptune drillship, according to the company's statement.In the U.S. Gulf, West Neptune won a four-month contract with LLOG Exploration expected to start in direct continuation of its current job, allowing the rig to avoid idle time; the award is expected to add approximately $48 million to backlog.Also in the U.S. Gulf, Sevan Louisiana received a two-month award from an undisclosed operator, planned to run in direct continuation of the rig's current contract with Walter Oil and Gas; the campaign will incl...