E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
31/26
E21B 43/22 (2006.01) C09K 8/512 (2006.01) C09K 8/88 (2006.01)
Patent
CA 2013469
A gellable aqueous composition particularly suitable for reducing the permeability of high-permeability zones in an oil reservoir is an aqueous solution comprising: - 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; - c) a buffer agent free or substantially-free of ligand characteristics towards the cross-linking agent, and chosen from organic bases and carboxylic or sulphonic aromatic organic acids; the solution pH being adjusted to a value within the range of about 2 to about 7.
Composition aqueuse gélifiable, particulièrement utile pour réduire la perméabilité de zones à forte perméabilité dans un gisement d'hydrocarbures. La composition est une solution aqueuse renfermant : a) un polymère organique hydrosoluble, réticulable par un ion métallique polyvalent; b) un ion de Cr(III), agent de réticulation; c) un agent tampon dont le caractère de ligand vis-à-vis de l'agent de réticulation est pratiquement ou totalement absent, et qui est choisi parmi des bases organiques et des acides organiques aromatiques, carboxyliques ou sulfoniques. Le pH de la solution est ajusté à une valeur se situant dans une plage de 2 à 7 environ.
Burrafato Giovanni
Lockhart Thomas Paul
Agip S.p.a.
Eniricerche S.p.a.
Robic
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