Nova Patents
EP0447967B1

Gelation of acrylamide-containing polymers with furfuryl alcohol and water dispersible aldehydes.

Abstract

This record has no abstract on file.

EP0447967B1, drawing sheet 1
Sheet 1 of 45

Term

Term ended

Expired 14 March 2011, 15.5 years ago.

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8 claims: 2 independent, 6 dependent

  1. 1
    A method of altering the permeability of a porous subterreanean formation with an ambient temperature above 93 °C, characterized by introducing into said formation, either independently or in admixture, (a) 0.1 to 5 percent of a water-soluble polymer being composed of (a1) 100 to 5 mole percent of at least one monomer of the formula I    wherein R₁, R₂ and R₃ are independently selected from hydrogen and alkyl radicals containing from 1 to 3 carbon atoms, and (a2) 0 to 95 mole percent of at least one monomer selected from (i) a monomer of the formula II    wherein R₄ is selected from hydrogen and alkyl radicals containing from 1 to 6 carbon atoms, R₅ is selected from alkylene radicals containing from 1 to 6 carbon atoms and arylene radicals containing from 6 to 10 carbon atoms, and M is selected from hydrogen ammonium, potassium and sodium;(ii) a monomer of the formula III    where R₆, R₇ and R₈ are independently selected from hydrogen and alkyl radicals containing from 1 to 2 carbon atoms;and (iii) a monomer selected from acrylic acid, sodium acrylate, potassium acrylate, ammonium acrylate, methacrylic acid, sodium methacrylate, potassium methacrylate, ammonium methacrylate, vinylsulfonic acid, sodium vinylsulfonate, potassium vinylsulfonate, ammonium vinylsulfonate, vinylbenzylsulfonic acid, sodium vinylbenzylsulfonate, potassium vinylbenzylsulfonate, ammonium vinylbenzylsulfonate, vinyl acetate, acrylonitrile, methacrylonitrile, vinyl alkyl ether, vinyl chloride, maleic anhydride, vinyl substituted cationic quaternary ammonium compounds, (acryloyloxyethyl)diethylmethylammonium methyl sulfate, and mixtures of any two or more thereof;(b) 0.005 to 5.0 percent of a water-dispersible aldehyde or aldehyde-generating compound (c) 0.005 to 5.0 percent of a furan derivative of the formula IV wherein R₉, R₁₀, R₁₁ and R₁₂ are independently selected from hydrogen, methyl, hydroxyl, carbinol, carboxyl, -CH₂COOH, acyl amide, mercaptan and primary amine radicals;and at least one of R₉, R₁₀, R₁₁ and R₁₂ radical is selected from hydroxyl, carbinol, carboxyl, -CH₂COOH, acylamide, mercaptan and primary amine radicals;and (d) 85 to 99.89 percent water wherein all percentages are weight percent based on the total of all constituents (a) to (d);and allowing the constituents (a) to (d) to form a gel in said porous subterranean formation.
  2. 3
    The method of claims 1 or 2 wherein said furan derivative (c) is selected from furfuryl acetate, furanamine, furandiamine, furantriamine, furantetramine, furancarbinol, furandicarbinol, furantricarbinol. furantetracarbinol, hydroxyfuran, dihydroxyfuran, trihydroxyfuran, tetrahydroxyfuran, furancarboxylic acid, furandicarboxylic acid, furantricarboxylic acid, furantetracarboxylic acid, furanmethylenecarboxylic acid, furanbis(methylenecarboxylic acid), furantris(methylenecarboxylic acid), furantetrakis(methylenecarboxylic acid), mercaptofuran, and combinations of two or more therof.
  3. 7
    A gel composition obtainable by gelation of the following constituents (a) 0.1 to 5 percent of a water-soluble polymer being composed of (a1) 100 to 5 mole percent of at least one monomer of the formula I wherein R₁, R₂ and R₃ are independently selected from hydrogen and alkyl radicals containing from 1 to 3 carbon atoms, and (a2) 0 to 95 mole percent of at least one monomer selected from (i) a monomer of the formula II    wherein R₄ is selected from hydrogen and alkyl radicals containing from 1 to 6 carbon atoms, R₅ is selected from alkylene radicals containing from 1 to 6 carbon atoms and arylene radicals containing from 6 to 10 carbon atoms, and M is selected from hydrogen ammonium, potassium and sodium;(ii) a monomer of the formula III    where R₆, R₇ and R₈ are independently selected from hydrogen and alkyl radicals containing from 1 to 2 carbon atoms;and (iii) a monomer selected from acrylic acid, sodium acrylate, potassium acrylate, ammonium acrylate, methacrylic acid, sodium methacrylate, potassium methacrylate, ammonium methacrylate, vinylsulfonic acid, sodium vinylsulfonate, potassium vinylsulfonate, ammonium vinylsulfonate, vinylbenzylsulfonic acid, sodium vinylbenzylsulfonate, potassium vinylbenzylsulfonate, ammonium vinylbenzylsulfonate, vinyl acetate, acrylonitrile, methacrylonitrile, vinyl alkyl ether, vinyl chloride, maleic anhydride, vinyl substituted cationic quaternary ammonium compounds, (acryloyloxyethyl)diethylmethylammonium methyl sulfate and mixtures of any two or more thereof;(b) 0.005 to 5.0 percent of a water-dispersible aldehyde or aldehyde-generating compound (c) 0.005 to 5.0 percent of a furan derivative of the formula IV    wherein R₉, R₁₀, R₁₁ and R₁₂ are independently selected from hydrogen, methyl, hydroxyl, carbinol, carboxyl, -CH₂COOH, acyl amide, mercaptan and primary amine radicals;and at least one of R₉, R₁₀, R₁₁ and R₁₂ radical is selected from hydroxyl, carbinol, carboxyl, -CH₂COOH, acylamide, mercaptan and primary amine radicals;and (d) 85 to 99.89 percent water wherein all percentages are weight percent based on the total of all constituents (a) to (d).
Independent claims3