ADDITIVES FOR IMPROVING HYDROCARBON RECOVERY Russian patent published in 2016 - IPC E21B43/24 E21B43/22 

FIELD: chemistry.

SUBSTANCE: group of inventions relates to thermal methods of recovering hydrocarbons from subterranean formations. Method for recovering hydrocarbons from subterranean formations comprises the following steps: (i) contacting the hydrocarbon from the subterranean formation with steam; (ii) contacting the hydrocarbon from the subterranean formation with one or more fluorinated hydrocarbons selected from: trifluoroethanol, trifluoropropanol, trifluorobutanol, allylhexafluoroisopropanol, hexafluoroisopropanol, triflaoroacetic acid, methyl trifluoroacetate, ethyl trifluoroacetate, isopropyl trifluoroacetate, trifluoroacetaldehydemethyl hemiacetal, trifluoroacetaldehyde ethyl hemiacetal, trifluoroacetic anhydride, trifluoroacetone, fiuorotoluene, and any combination or mixture thereof; and (iii) recovering the hydrocarbon from the subterranean formation.

EFFECT: technical result is increasing the production with the same steam input, improving the heat efficiency as well as reducing the oil-water interfacial tension.

14 cl, 2 dwg, 5 tbl, 4 ex