The present invention relates to an emulsion, consisting of an oil phase and an aqueous phase and comprising as emulsion components (&alpha；1) 15 to 40% by weight of at least one water-immiscible organic solvent as solvent of the oil phase, (&alpha；2) 15 to 40% by weight of water as solvent of the aqueous phase, (&alpha；3) 10 to 40% by weight of at least one surfactant, (&alpha；4) 10 to 40% by weight of an alkoxylated fatty alcohol and (&alpha；5) 0 to 25% by weight of at least one other additive, wherein the quantities by weight of the components (&alpha；1) to (&alpha；5) are each relative to the total weight of the emulsion, and together add up to 100% by weight. The invention further relates to a method for producing an emulsion, to the emulsion which can be obtained from said method, to the use of an emulsion, to a method for cleaning the surfaces of well holes, drilling devices or drillings, to a method for producing a well bore, and to a method for producing an oil or a gas.
