Patent ID: 8138127

Claim:
A method of treating a hydrocarbon-bearing clastic formation having water, the method comprising contacting the hydrocarbon-bearing clastic formation with a composition comprising solvent and a nonionic fluorinated polymeric surfactant, wherein the nonionic fluorinated polymeric surfactant comprises: at least one divalent unit represented by formula: a poly(alkyleneoxy) segment; wherein R f represents a perfluoroalkyl group having from 1 to 8 carbon atoms; R and R 2 are each independently hydrogen or alkyl of 1 to 4 carbon atoms; and n is an integer from 2 to 10; and wherein the solvent at least partially displaces or solubilizes the water in the hydrocarbon-bearing formation, wherein the water is non-connate water or wherein the hydrocarbon-bearing formation comprises a water-bearing well.