Patent ID: 8629089

Claim:
A method comprising contacting a hydrocarbon-bearing formation with a treatment composition comprising solvent and a fluoroether-containing polymer or oligomer, wherein the fluoroether-containing polymer or oligomer comprises at least one first divalent unit represented by formula: wherein each Rf is independently selected from the group consisting of: Rf a —(O) t —CHL′-(CF 2 ) n —; [Rf a —(O) t —C(L)H—CF 2 —O] m —W—; Rf b —O—(CF 2 ) p —; F(C k F 2k )—(O—C k F 2k ) p —O—CF 2 —; and CF 3 —O—(CF 2 ) 3 —OCF(CF 3 )—CF 2 ) Z —O-L 1 -; each X 1 is independently selected from the group consisting of alkylene and arylalkylene, wherein alkylene and arylalkylene are each optionally interrupted by at least one ether linkage; R and R 1 are each independently selected from the group consisting of hydrogen and alkyl having from 1 to 4 carbon atoms; Rf a represents a partially or fully fluorinated alkyl group having from 1 to 6 carbon atoms and optionally interrupted with at least one oxygen atom; Rf b is selected from the group consisting of CF 3 CFH— and F(C j F 2j )—; L is selected from the group consisting of F and CF 3 ; L′ is F or H; W is selected from the group consisting of alkylene and arylene; L 1 is selected from the group consisting of —CF 2 —, —CF 2 CF 2 —, and —CF(CF 3 )—; t is 0 or 1, wherein when Rf is represented by formula Rf a —(O) t —CHF—(CF 2 ) n — and t is 0, then Rf a is interrupted with at least one oxygen atom; m is 1, 2, or 3; n is 0 or 1; j is an value from 1 to 4; each k is independently 1 or 2; each p is independently an value from 1 to 6; and z is an value from 0 to 3.