Copolymer for inhibiting inorganic deposits

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 220/06 (2006.01) C08F 220/38 (2006.01) C08F 230/02 (2006.01) C09K 8/508 (2006.01)

Patent

CA 2749900

The invention relates to a copolymer comprising: A) at least one monomer unit a) derived from at least one ethylenically unsaturated aliphatic monocarboxylic or polycarboxylic acid, from a corresponding anhydride or from a corresponding water-soluble salt; B) at least one monomer unit b) derived from a particular sulphonated or sulphated, ethylenically unsaturated ether or at least one monomer unit (b1) derived from an ethylenically unsaturated sulphonated monomer, other than (b); C) at least one monomer unit (c) derived from a monomer of average general formula [CH2=CH-CH2-R6-O-]XP(=O)(OM)3-X. The invention also relates to a method for preparing such a copolymer, to an inhibitory composition comprising such a copolymer and to a method for inhibiting inorganic deposits in an oil reservoir by means of said inhibitory composition.

L'invention concerne un copolymère comprenant : A) au moins une unité monomère a) dérivée d'au moins un acide aliphatique monocarboxylique ou polycarboxylique éthyléniquement insaturé, d'un anhydride correspondant ou d'un sel hydrosoluble correspondant; B) au moins une unité monomère b) dérivée d'un éther éthyléniquement insaturé sulfoné ou sulfaté particulier ou au moins une unité monomère (b1) dérivée d'un monomère sulfoné éthyléniquement insaturé, autre que (b), C) au moins une unité monomère (c) dérivée d'un monomère de formule générale moyenne [CH2=CH-CH2-R6- O-]x P(=O)(OM)3-x.L'invention concerne également un procédé de préparation d'un tel copolymère, une composition inhibitrice comprenant un tel copolymère et un procédé d'inhibition des dépôts inorganiques dans un réservoir pétrolier au moyen de ladite composition inhibitrice.

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