Prevention and remediation of water and condensate blocks in wells

A method for preventing or removing water block and/or condensate block in a subterranean formation penetrated by a well bore comprising the step of contacting the formation with an aqueous composition comprising a fluorinated copolymer copolymerized from monomers comprising:

• (a) from about 30 wt % to about 90 wt % of at least one monomer of formula I:
• Rf-Q-A-C(O)—C(R)═CH2 I
• wherein
• Rf is a straight or branched-chain perfluoroalkyl group of from 2 to 6 carbon atoms,
• R is H or CH3,
• A is O, S or N(R′), wherein R′ is H or an alkyl of from 1 to about 4 carbon atoms,
• Q is alkylene of 1 to about 15 carbon atoms, hydroxyalkylene of 3 to about 15 carbon atoms, —(CnH2n)(OCqH2q)m—, —SO2—NR′(CnH2n)—, or —CONR′(CnH2n)—, wherein R′ is H or an alkyl of from 1 to about 4 carbon atoms, n is 1 to about 15, q is 2 to about 4, and m is 1 to about 15;
• (b) from about 10 wt % to about 70 wt % of at least one monomer or a mixture of monomers is selected from formula IIA, formula IIB, and formula IIC:
• (R1)2N—(CH2)r—Z—C(O)—C(R2)═CH2 IIA
• (O)(R3)(R4)N—(CH2)r—Z—C(O)—C(R2)═CH2 IIB
• X−(R5)(R4)(R3)N+—(CH2)r—Z—C(O)—C(R2)═CH2 IIC
• wherein
• Z is —O— or —NR5—;
• R1 is an alkyl group of from 1 to about 3 carbon atoms;
• R2 is H or an alkyl radical of 1 to about 4 carbon atoms;
• R3 and R4 are each independently an alkyl of 1 to 4 carbon atoms, hydroxyethyl, benzyl, or R3 and R4 together with the nitrogen atom form a morpholine, pyrrolidine, or piperadine ring;
• R5 is H or an alkyl of 1 to 4 carbon atoms, or R3, R4 and R5 together with the nitrogen atom form a pyridine ring;
• r is 2 to 4;
• provided that for formula IIA the nitrogen is from about 40% to 100% salinized;
• and
• (c) from 0 wt % to about 7 wt % of a monomer of the formula III, IV, V or VI or a mixture thereof:
• CH2(O)CH2—CH2—O—C(O)—C(R2)═CH2 III;
• Cl—CH2—CH(OH)CH2—O—C(O)—C(R2)═CH2 IV;
• (R6)OC(O)C(R6)═CH2 V;
• or
• CH2═CCl2 VI
• wherein
• each R2 is independently H or an alkyl radical of 1 to about 4 carbon atoms, and each R6 is independently H or an alkyl of 1 to about 8 carbon atoms, wherein the fluorinated copolymer has an average molecular weight less than about 50,000 g/mol.

A fluorinated copolymer copolymerized from monomers comprising:

• (a) from about 30 wt % to about 90 wt % of at least one monomer of formula I:
• Rf-Q-A-C(O)—C(R)═CH2 I
• wherein
• Rf is a straight or branched-chain perfluoroalkyl group of from 2 to 6 carbon atoms,
• R is H or CH3,
• A is O, S or N(R′), wherein R′ is H or an alkyl of from 1 to about 4 carbon atoms,
• Q is alkylene of 1 to about 15 carbon atoms, hydroxyalkylene of 3 to about 15 carbon atoms, —(CnH2n)(OCqH2q)m—, —SO2—NR′(CnH2n)—, or —CONR′(CnH2n)—, wherein R′ is H or an alkyl of from 1 to about 4 carbon atoms, n is 1 to about 15, q is 2 to about 4, and m is 1 to about 15;
• (b) from about 10 wt % to about 70 wt % of at least one monomer or a mixture of monomers is selected from formula IIA, formula IIB, and formula IIC:
• (R1)2N—(CH2)r—Z—C(O)—C(R2)═CH2 IIA
• (O)(R3)(R4)N—(CH2)r—Z—C(O)—C(R2)═CH2 IIB
• X−(R5)(R4)(R3)N+—(CH2)r—Z—C(O)—C(R2)═CH2 IIC
• wherein
• Z is —O— or —NR5—;
• R1 is an alkyl group of from 1 to about 3 carbon atoms;
• R2 is H or an alkyl radical of 1 to about 4 carbon atoms;
• R3 and R4 are each independently an alkyl of 1 to 4 carbon atoms, hydroxyethyl, benzyl, or R3 and R4 together with the nitrogen atom form a morpholine, pyrrolidine, or piperadine ring;
• R5 is H or an alkyl of 1 to 4 carbon atoms, or R3, R4 and R5 together with the nitrogen atom form a pyridine ring;
• r is 2 to 4;
• provided that for formula IIA the nitrogen is from about 40% to 100% salinized;
• and
• (c) from 0 wt % to about 7 wt % of a monomer of the formula III, IV, V or VI or a mixture thereof:
• CH2(O)CH2 —CH2—O—C(O)—C(R2)═CH2 III;
• Cl—CH2—CH(OH)CH2—O—C(O)—C(R2)═CH2 IV;
• (R6)OC(O)C(R6)═CH2 V;
• or
• CH2═CCl2 VI
• wherein
• each R2 is independently H or an alkyl radical of 1 to about 4 carbon atoms, and each R6 is independently H or an alkyl of 1 to about 8 carbon atoms, wherein the fluorinated copolymer has an average molecular weight less than about 50,000 g/mol.