Process for increasing injectability of injection wells in oil extraction by means of water flooding

摘要

The injectability of injection wells can be increased in oil extraction by means of water flooding, by injecting a solution, dispersion, or emulsion of carboxymethylated oxethylates of the formula ##EQU1## in formation water or flooding water and, optionally, crude oil, into the injection well, the tenside being selected so that the phase inversion temperature of the system of reservoir oil/formation water or flooding water/tenside/optional additives lies at least 12 C. above the reservoir temperature.