Gellable aqueous composition and its use in enhanced...

Details Gellable aqueous composition and its use in enhanced... Gellable aqueous composition and its use in enhanced...

E - Fixed Constructions

21

B

31/26

E21B 43/22 (2006.01) C09K 8/512 (2006.01) C09K 8/88 (2006.01)

Patent

CA 2013467

A gellable aqueous composition able to reduce the permeability of high-permeability zones in an oil reservoir is a aqueous solution containing metered quantities of: - a) a water-soluble organic polymer cross-linkable by the effect of a polyvalent metal ion cross-linking agent; - b) a Cr(III) ion cross-linking agent; and - c) a ligand for the cross-linking agent chosen from water-soluble organic alpha-hydroxy acids and alpha-amino acids.

Composition aqueuse gélifiable permettant de réduire la perméabilité de zones très perméables dans un gisement d'hydrocarbures. La composition est une solution aqueuse renfermant des quantités déterminées : a) d'un polymère organique hydrosoluble, réticulable par un ion métallique polyvalent; b) d'ion de Cr(III), agent de réticulation; c) d'un ligand pour l'agent de réticulation, choisi parmi des acides organiques alpha-hydroxylés et des acides organiques alpha-aminés, hydrosolubles.

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