Petróleos Mexicanos will pay $484,000 a day to Noble Corp. for an oil rig that will allow the company to drill in waters up to 7,000 feet deep for the first time. Pemex, as Mexico's state oil company is known, will take delivery of the Noble Max Smith rig in August under a three-year contract, Noble Corp. said in a statement. The rig is being moved to Mexico from the U.S. Gulf of Mexico following upgrades and maintenance