Copolymer for inhibiting inorganic deposits

摘要

The invention relates to a copolymer having:
A) at least one monomer unit a) derived from at least one ethylenically unsaturated aliphatic monocarboxylic or polycarboxylic acid, a corresponding anhydride, or a corresponding water-soluble salt;B) at least one monomer unit b) derived from a particular sulfonated or sulfated ethylenically unsaturated ether or at least one monomer unit (b′) derived from a sulfonated ethylenically unsaturated monomer other than (b),C) at least one monomer unit (c) derived from a monomer with the 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, an inhibitor composition including such a copolymer, and a method for inhibiting inorganic deposits in a petroleum reservoir by means of said inhibitor composition.

主权项

1. Copolymer comprising:
A) at least one monomer unit a) derived from at least one ethylenically unsaturated aliphatic monocarboxylic or polycarboxylic acid, a corresponding anhydride, or a corresponding water-soluble salt; B) at least one monomer unit b) derived from an ethylenically unsaturated sulfonated or sulfated monomer unit b) with the formula (I)
CH2═C(R1)—C(R2)(R3)—O—R′—Y−X+  (I) in which formula the various symbols have the following meaning:
R1, R2, and R3, similar or different, represent
a hydrogen atom oran alkyl radicalR′ represents a linear or branched divalent aliphatic radical comprising at least one OH substituentY− represents SO3− or SO4−X is a counterion or at least one monomer unit b′) derived from an ethylenically unsaturated sulfonated monomer unit other than (b) with the formula (II)
CH2═C(R1)—(Z)n—R″—SO3−X+  (II) in which formula the various symbols have the following meaning:
R1 represents
a hydrogen atom oran alkyl radicaln is equal to 0 or 1Z represents a divalent group with the formula —C(O)—N(R4)—R5— where
R4 represents a hydrogen atom or an alkyl radicalR5 represents a linear or branched aliphatic divalent radicalR″ represents a linear or branched divalent aliphatic radicalX is a counterion; and C) at least one monomer unit (c), wherein the at least one monomer unit (c) comprises a diphosphate ester derived from polyoxyethylene alkyl ether phosphate, wherein the polyoxyethylene alkyl ether phosphate has the general formula
[CH2═CH—CH2—R6—O—]xP(═O)(OM)3-x  (III) Wherein:
R6 is a polyoxyethylene groupx is a number between 1 and 2 inclusive or exclusiveM is a hydrogen atom or a cation counterion.