Lots of companies in lots of industries import, export and sell domestically in varying degrees. The reason oil companies do this is because they have customers all over the world and they do business all over the world. Many of them have contractually obligations with foreign customers. Many of them would be very reluctant to put all of their eggs in one basket (US) and ignore their global customers. Especially since the current US administration is at war with their industry. Keep googling you are missing a lot of information.
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