Reviewed are devices for extraction of intermidiate layer, accumulated at the oil-water interface, composed of high-concentrated emulsion, stabilized by tar, asphaltens, clays, sulfides of iron, aluminum, copper and silicium. It is noted, that unification link during preparation of complex high-concentrated emulsions is the use of two-phase decantored and, after that, three-phase plated centrifuge, which enables to obtain from the units clean oil, water and sludge.