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    • 9. 发明专利
    • ES2041494T3
    • 1993-11-16
    • ES90200727
    • 1990-03-27
    • ENIRICERCHE S.P.A.AGIP S.P.A.
    • LOCKHART, THOMAS PAULBURRAFATO, GIOVANNI
    • B01J13/00C09K8/04C09K8/512C09K8/88E21B33/138E21B43/25
    • 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 Cr ions; - c) a water-soluble inorganic Cr salt; - d) a gelation-retardant organic ligand definable by the formula: @ @@ COOH 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 min (where R min is an alkyl radical with from 1 to 5 carbon atoms), or NR sec R''' (where R sec 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/Cr weight ratio varying from 1:1 to 1000:1; the molar organic ligand/Cr ratio varying from 0.5 to 500:1; the composition having a pH equal to or less than about 7.0.