Process for reducing the relative permeability to water in oil formations that have

摘要

A process for the selective and controlled reduction of water permeability formations, which have high permeability Oil dc average temperature between 110 and 45 C and CCrossed by a well for Oil Production and / or gas, wherein Said process comprisesFor The Well of injection - production: a Slurry of an aqueous solution of a cationic Polymer in an amount required for absorption in a certain radius of penetration in trainingA portion of the aqueous solution creates a layer of adsorbed Polymer formation contains positive residual charges and free,While another portion remains adsorbed and can be Displaced by successive slurries of Brackish water to the required radius and Polymer - injecting Grout penetration; a spacingAn aqueous solution of Brackish water.As to displace the absorbed portion of the slurry in the aqueous solution of a cationic Polymer To the Interior of the formation while separates the slurry from the polymer SolutionThe Grout injected as cationic and Anionic Polymer aqueous solution will be injected slurry; injecting an aqueous solution of Anionic Polymer in an amount sufficient TorqueTo create a layer of Polymer adsorbed Anionic cationic Polymer Layer to the previously adsorbed in the Rock formation; - Inject Grout spacing a Brackish water SolutionAqueous slurries of Polymer To Separate and move the iechada of the aqueous solution of Anionic Polymer into the Interior of the training; - repeat the alternate Injection of Grout Solution offeredN aqueous cationic Polymers and Anionic slurry being Spaced by the Injection of a Slurry of Brackish water, and the last layer is a cationic Polymer,Until the injection pressure of the polymer aqueous solution to achieve the desired value of the residual Resistance factor (rrfw); - Close the wellbore during the time required for the solutionAqueous slurry of Polymer is absorbed in the yreiniciar Rock formation, The Well Production.