Petroleo Brasileiro S.a. - Petrobras

Luiz Cesar Ferreira Barbosa

Geraldo Maria Ramos De Godoy

Carlos Roberto Carvalho De Holleben

S&eacute;rgio Luiz Pereira De Freitas Coelho

A process for the selective and controlled reduction of permeability to water in oil-bearing formations made up of sandstone or limestone, the process comprising the injection of a slug of polymer aqueous solutions having a polarity opposite to the polarity of the rock, followed by the injection of a spacing slug of alkaline halide and then a fresh slug of polymer aqueous solution, the polarity of which is opposite to the polarity of the first polymer slug, and then a slug of aqueous solution of trivalent metal crosslinking agent to effect the partial crosslinking of the polymer charges, the polymer layers being successively added until the injection pressure of the polymer aqueous solutions show that the desired Residual Resistance Factor RRF was attained, and well production may be resumed.

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Rio de Janeiro, Brazil

Luiz Cesar Ferreira Barbosa