Patent ID: 8716198

Claim:
A comprising the step of contacting a subterranean formation penetrated by a well bore to prevent or remove water block and/or condensate block 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: R f -Q-A-C(O)—C(R)═CH 2 I wherein R f is a straight or branched-chain perfluoroalkyl group of from 2 to 6 carbon atoms, R is H or CH 3 , 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, —(C n H 2n )(OC q H 2q ) m —, —SO 2 —NR′(C n H 2n )—, or —CONR′(C n H 2n )—, 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, or formula IIC: (R 1 ) 2 N—(CH 2 ) r —Z—C(O)—C(R 2 )═CH 2 IIA (O)(R 3 )(R 4 )N—(CH 2 ) r —Z—C(O)—C(R 2 )═CH 2 IIB X − (R 5 )(R 4 )(R 3 )N + —(CH 2 ) r —Z—C(O)—C(R 2 )═CH 2 IIC wherein Z is —O— or —NR 5 —; R 1 is an alkyl group of from 1 to about 3 carbon atoms; R 2 is H or an alkyl radical of 1 to about 4 carbon atoms; R 3 and R 4 are each independently an alkyl of 1 to 4 carbon atoms, hydroxyethyl, benzyl, or R 3 and R 4 together with the nitrogen atom form a morpholine, pyrrolidine, or piperadine ring; R 5 is H or an alkyl of 1 to 4 carbon atoms, or R 3 , R 4 and R 5 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: CH 2 (O)CH 2 —CH 2 —O—C(O)—C(R 2 )═CH 2 III; Cl—CH 2 —CH(OH)CH 2 —O—C(O)—C(R 2 )═CH 2 IV; (R 6 )OC(O)C(R 6 )═CH 2 V; or CH 2 ═CCl 2 VI wherein each R 2 is independently H or an alkyl radical of 1 to about 4 carbon atoms, and each R 6 is independently H or an alkyl of 1 to about 8 carbon atoms, wherein fluorinated copolymer has an average molecular weight less than about 20,000g/mol, and wherein any perfluoroaliky moieties present in the fluorinated copolymer are no larger than 6 carbon atoms long.