The incident happened in the C-33 village in the municipality of Cárdenas.
Mexico has awarded contracts for exploration and production on land and in shallow water since the 2014 reform that ended seven decades of state monopoly on the oil business.
Analysts and officials said Tuesday the problem has broken out into the open.
Four workers suffered burns and were taken to a local hospital, another worker fell as he operated a fire hose during the emergency response.
The instrument will target investments in oil, electricity, water and transportation projects, according to the prospectus, which is expected to be published by the Mexican bourse this week.
Pemex said crude output for the quarter was down 5.5 percent, and natural gas production dropped nearly 1.7 percent.
Crude output in Mexico stood at 2.27 million bpd in July, according to data from national oil company Pemex.
The program, which includes options on Maya and Brent crudes, will cover 212 million barrels of oil in total at a cost of US$1.09 billion
A closed export arbitrage may not stop Mexico from taking advantage of permits to import U.S. crude in exchange for more of its own exported oil, something it has been seeking for years as a means of improving its refinery operations.
"We are looking at joint ventures with strategic players, we've been working so far with companies to participate together," company executives said on a conference call.