Billionaire Carlos Slim's Grupo Carso said its Operadora Cicsa unit received contracts worth $205 million from state-owned Petroleos Mexicanos, or Pemex, to build three offshore oil rigs.

The contracts were signed with Pemex Exploracion y Produccion, a unit of the state-owned oil giant, and cover construction of the Ek-A2, Ayatsil-A and KU-B platforms in Campeche Sound, Grupo Carso said in a filing with Mexican securities regulators.

The orders will be fulfilled in about 17 months, Grupo Carso said, adding that the contracts cover engineering, supply, construction and other services for the platforms.

Grupo Carso is a conglomerate with interests in a number of industrial, trade and infrastructure businesses.

Slim is ranked by Forbes magazine as the world's richest person.

Pemex, Latin America's largest corporation and the world's third-largest oil producer, has a monopoly over the Mexican petroleum industry.

The state-owned corporation is the biggest source of revenue for the Mexican Treasury. EFE