Rescuers have pulled 58 oil workers from storm-tossed waters but have yet to control the oil leak, Mexico's oil monopoly Petroleos Mexicanos, or Pemex said in a news release.
At least 18 employees of the state oil company were still either floating at sea in life rafts or were unaccounted for, it said. The company said it had located a raft but "weather conditions in the area have made it impossible to reach the vessel."
The company said 81 workers abandoned a subcontractor's Usumacinta platform Tuesday after it hit the Kab 101 light-production rig amid 25-foot waves and winds gusting to 80 mph.
It was not immediately clear how much gas and oil had spilled from the accident about 20 miles off the port of Dos Bocas in the Gulf coast state of Tabasco.
The storm forced Mexico's main oil ports to close. They remained closed Wednesday, Pemex said.
The company said Tuesday that the crash knocked out some controls on a valve.
The Usumacinta drilling rig is owned by the Compania Perforadora Central SA de CV and operates under contract to Pemex.