Process for altering the relative permeability of a...

E - Fixed Constructions – 21 – B

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E21B 43/25 (2006.01) C09K 8/512 (2006.01) C09K 8/588 (2006.01) C09K 8/88 (2006.01) E21B 33/138 (2006.01)

Patent

CA 2395928

A process for treating a hydrocarbon-bearing formation having at least one hydrocarbon bearing zone and at least one water bearing zone wherein the ratio of the permeability of the hydrocarbon bearing zone(s) to the permeability of the water bearing zone(s) is in the range of from 1:20 to 3:1 comprising: a) sequentially injecting into the formation: (i) an aqueous polymer solution comprising 0.01 to 0.5 weight percent of a water-soluble polymer having from 0.01 to 7.5 mole % of crosslinkable carboxylate and/or phosphonate groups and a molecular weight in the range of 250,000 to 12,000,000; and (ii) an aqueous solution of a crosslinking agent; and b) back-producing the aqueous polymer solution over the crosslinking agent so that the polymer crosslinks within the formation to form a gel which is collapsible to allow hydrocarbon flow.

L'invention concerne un procédé de traitement d'une formation d'hydrocarbures comportant au moins une zone contenant des hydrocarbures et au moins une zone contenant de l'eau, le rapport de perméabilité de la ou des zone(s) contenant des hydrocarbures à la ou les zone(s) contenant de l'eau se situant entre 1:20 et 3:1. Le procédé de l'invention consiste : a) à injecter de manière séquentielle dans la formation : (i) une solution polymère aqueuse comprenant 0,01 à 0,5 % en poids de polymère soluble dans l'eau qui comprend 0,01 à 7,5 mole % de carboxylate réticulable et/ou des groupes phosphonate et un poids moléculaire compris entre 250'000 à 12'000'000, et (ii) une solution aqueuse d'un agent de réticulation, et b) à récupérer la solution polymère aqueuse par le biais de l'agent de réticulation, de manière que le polymère se lie dans la formation pour former un gel malléable, afin de permettre l'écoulement d'hydrocarbures.

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