This article offers information about the procedures known as “migration” of contracts provided for in the Hydrocarbons Law and the Hydrocarbons Income Law, through which Petróleos Mexicanos (PEMEX) can request from the Department of Energy (SENER) the transformation of certain Contracts for the Production of Hydrocarbons (CIEPs) and the Financed Public Works Contracts (COPFs) to any of the following four new types of Exploration and Extraction Contracts (CEEs): license, production sharing, profit sharing and services contracts.