The incident occurred late Thursday at the Cosoleacaque complex in Veracruz state.
Authorities recently concluded talks to ship products to Brazil and Argentina.
Brazil's state-run oil company said it would pump an additional US$600mn into exploration and production projects over the next five years after posting a fourth quarter profit.
The state refiner says a bill to hold a referendum lacks technical and legal foundation.
The Argentine government and the International Energy Agency are to strengthen ties as the South American country prepares to assume the G20 presidency in 2018.
Brazil's national development bank says builders involved in the graft probe can access financing provided certain conditions are met.