Patent ID: 8580715

Claim:
A method of modifying a surface effect within an oil or gas well, said surface effect selected from the group consisting of wetting, penetration, spreading, flowing, emulsifying, dispersing, foaming, stimulating, reducing viscosity, altering permeability, and stabilizing, comprising adding to a liquid acidic or saline aqueous medium or a liquid acidic or saline solvent medium a compound of formula (I) wherein, R f is R 1 (CH 2 CH 2 ) n —, R 1 is a C 7 to C 20 perfluoroalkyl group interrupted by at least one oxygen atom, n is an integer of 1 to 3, and R is H, C 1 to C 5 linear or branched alkyl, or C 1 to C 5 linear or branched alkoxy, wherein the compound of formula (I) is added to a medium to be contacted with a hydrocarbon-bearing subterranean formation, and wherein the medium is a fluid injected into the subterranean formation.