State-owned oil giant Petroleos Mexicanos, or Pemex, plans to add between eight and 12 offshore platforms to its fleet, making it the world's largest operator of jack-up, or self-elevating, and modular rigs, CEO Emilio Lozoya Austin said.

"Currently, Pemex Exploration and Production (PEP) carries out its marine drilling activities via 41 platforms, five semisubmersible and 36 self-elevating, as well as 26 modular units," Lozoya Austin said in a statement.

The CEO discussed Pemex's plans during a visit to Singaporean shipbuilding firm Keppel FELS, which is building two jack-up drilling rigs that will be used in the shallow waters of the Gulf of Mexico in the first half of 2015.

"Pemex is in the middle of the most ambitious drilling program in decades," Lozoya Austin said.

Earlier this week, Lozoya Austin took delivery of two ships from South Korea's SPP Shipbuilding Group.

Pemex, the world's No. 4 oil producer with output of about 2.5 million barrels per day, is the biggest contributor to Mexico's Treasury. EFE