Nigeria has not renewed several drilling licences that expired as far back as 2008 with foreign oil companies

U.S. energy giant Exxon Mobil signed 20-year oil licence renewals on Nigerian assets producing around 550,000 barrels per day on Wednesday, the company's country manager said, ending months of negotiations.

As wide-ranging energy reforms have been delayed by political wrangling, Nigeria has not renewed several drilling licences that expired as far back as 2008 with foreign oil companies, including Royal Dutch Shell and Chevron .

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