FIELD: oil and gas industry.
SUBSTANCE: invention relates to improved oil purification method with higher efficiency comprising preliminary mixing of oil and washing liquid by feeding them into a mixer, supplying the formed mixture to a flow settling tank for gravitational separation, where in the mixer the jets of purified oil and washing liquid are directed towards each other with equal cross-section at the point of collision of jets, from the mixer the mixture is directed into the flow settling tank for gravitational separation through a horizontal slit diffuser with a height providing laminar flow of mixture layer from diffuser outlet.
EFFECT: invention is intended for purifying oil contaminated with floating liquid medium, for example, formation water or flushing liquid and can be used for preparation of oil at fields and oil refineries, and in any industry where such a need arises.
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