Gellable aqueous composition and its use in enhanced...

E - Fixed Constructions – 21 – B

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

Patent

CA 2013461

The permeability of high-permeability zones in a oil reservoir can be reduced by using a gellable aqueous composition with delayed gelation. The composition comprises: - a) water; - b) a high-molecular weight natural or synthetic water-soluble polymer cross-linkable by means of Cr3+ ions; - c) a water-soluble inorganic Cr3+ salt; - d) a gelation-retardant organic ligand definable by the formula: (see fig. I) where: R is a direct single bond, or a saturated or unsaturated linear or branched aliphatic hydrocarbon radical with from 1 to 6 carbon atoms, or a cycloalkyl radical with from 3 to 7 carbon atoms, or an aryl radical; X is OH or OR' (where R' is an alkyl radical with from 1 to 5 carbon atoms), or NR"R"' (where R" and R"', which may be equal or different, are H or an alkyl radical with from 1 to 5 carbon atoms); and relative water-soluble salts; the polymer b) being present in a concentration of between 1000 and 50,000 ppm; the salt c) being present in a concentration of between 10 and 5000 ppm evaluated as metal; the polymer/Cr3+ weight ratio varying from 1:1 to 1000:1; the molar organic ligand/Cr3+ ratio varying from 0.5 to 500:1; the composition having a pH equal to or less than about 7Ø

La perméabilité de zones très perméables dans un gisement d'hydrocarbures peut être réduite grâce à une composition aqueuse gélifiable, à gélification retardée. La composition comprend : a) de l'eau; b) un polymère hydrosoluble, naturel ou synthétique, de masse molaire élevée, réticulable par des ions Cr3+; c) un sel minéral de Cr3+ hydrosoluble; d) un ligand organique retardateur de gélification, défini par la formule (voir fig. I), où R est une liaison simple directe ou un radical aliphatique, linéaire ou ramifié, saturé ou insaturé, de 1 à 6 atomes de carbone, ou un cycloalkyle de 3 à 7 atomes de carbone, ou un aryle; X est OH ou OR' (R' étant un alkyle de 1 à 5 atomes de carbone) ou NR"R"' (R" et R"', qui peuvent être les mêmes ou différents, représentent H ou un alkyle de 1 à 5 atomes de carbone); et les sels connexes hydrosolubles. Le polymère en b) est présent à une concentration se situant entre 1000 et 50000 ppm; le sel en c) est présent à une concentration se situant entre 10 et 5000 ppm, évaluée en métal; le rapport massique polymère/Cr3+ varie de 1:1 à 1000:1; le rapport molaire ligand organique/Cr3+ varie de 0,5 à 500:1; enfin, la composition a un pH égal ou inférieur à 7,0 environ.

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