| 主权项 |
1. A method comprising contacting a hydrocarbon-bearing formation with a composition comprising solvent and a fluoropolyether compound, wherein the fluoropolyether compound:
is represented by formula Rf′—{C(O)—N(R1)—X″—[OC(O)—V′—P(O)—(OY)2]y}z, or comprises at least one first divalent unit represented by and at least one of
a second divalent unit comprising a pendant Z group;or a monovalent unit comprising a thioether linkage and at least one terminal Z group,wherein
each Rf is independently a fluoropolyether group; Rf′ is a monovalent or divalent fluoropolyether group; each Z group is independently —P(O)(OY)2 or —O—P(O)(OY)2; each Q is independently a bond, —C(O)—N(R1)—, or —C(O)—O—; R and R1 are each independently hydrogen or alkyl having up to 4 carbon atoms; each X is independently alkylene, arylalkylene, or alkylarylene, wherein alkylene, arylalkylene, and alkylarylene are each optionally interrupted by at least one ether linkage; each X″ is independently a divalent or trivalent group selected from the group consisting of alkylene, arylalkylene, and alkylarylene, wherein alkylene, arylalkylene, and alkylarylene are each optionally interrupted by at least one ether linkage; each V′ is independently alkylene that is optionally interrupted by at least one ether linkage or amine linkage; each Y is independently selected from the group consisting of hydrogen, alkyl, trialkylsilyl, a counter cation, or a bond to the formation; n′ is in a range from 4 to 50; x is 1 or 2; and y and z are each independently 1 or 2. |
