By REBECCA F. ELLIOTT Chevron plans to significantly expand its operations in Venezuela, the U.S. oil giant said earlier this week, taking yet another step to broaden the U.S. sphere of influence in the South American country. The Houston-based company, already Venezuela’s largest private oil producer, said it would more than double its production in the country over the next five years to 600,000 barrels a day. That represents over half of Venezuela’s current output. Chevron, which is…
