The present invention relates to an emulsion, consisting of an oil phase andan aqueous phaseand comprising as emulsion components (.alpha.1) 15 to 40% by weight of atleast onewater--immiscible organic solvent as solvent of the oil phase, (.alpha.2) 15to 40% by weight of water assolvent of the aqueous phase, (.alpha.3) 10 to 40% by weight of at least onesurfactant, (.alpha.4) 10 to 40%by weight of an alkoxylated fatty alcohol and (.alpha.5) 0 to 25% by weight ofat least one otheradditive, wherein the quantities by weight of the components (.alpha.1) to(.alpha.5) are each relative to thetotal weight of the emulsion, and together add up to 100% by weight. Theinvention furtherrelates to a method for producing an emulsion, to the emulsion which can beobtained from saidmethod, to the use of an emulsion, to a method for cleaning the surfaces ofwell holes, drillingdevices or drillings, to a method for producing a well bore, and to a methodfor producing an oilor a gas.
