Patent ID: 8524643

Claim:
A method for mobilizing and recovering the hydrocarbons from underground deposits comprising flooding said underground deposits of hydrocarbons with a liquid mixture comprising a surfactant and a cosurfactant, wherein the proportion of the cosurfactant, based on the surfactant, is in the range of from 0.01 to 99.99%, and wherein the cosurfactant is one or more amphiphilic polymers having the general structural formula wherein A′ 3 -Y 3 is a monofunctional branched alcohol radical having 8 to 30 carbon atoms per molecule, wherein said monofunctional branched alcohol is a Guerbet alcohol, A 3 is a structural unit having the formula wherein R 1 , R 2 , R 3 , and R 4 are, independently of one another, hydrogen, methyl, ethyl, n-propyl, isopropyl, octyl, or phenyl, with the proviso that not more than three of R 1 , R 2 , R 3 and R 4 are hydrogen, m 3 is an integer from 10 to 300, X 3 is a structural unit having the formula wherein R′, R 2 , R 3 , and R 4 are, independently of one another, hydrogen, methyl, ethyl, n-propyl, isopropyl, octyl, or phenyl, q is 0, B 3 is a monomeric subunit based on ethylene oxide or a mixture of ethylene oxide and propylene oxide, n 3 is an integer from 20 to 500, and P 3 is q+1.