OIL TREATMENT METHOD Russian patent published in 2015 - IPC E21B43/34 C10G7/00 

FIELD: oil and gas industry.

SUBSTANCE: oil treatment method includes oil separation into fractions in the rectification tower, extraction of natural gas liquids (NGL), cooling of NGL up to temperature sufficient for condensation, delivery of condensed NGL to buffer-separating container, pumping out of a part of NGL to the top part of the rectification tower and excessive part to the warehouse. NGL vapours are taken from the top of the rectification tower, NGL vapours are cooled down in heat exchanger until liquid-gas mixture is formed, then the liquid-gas mixture is cooled in the other heat exchanger, further the liquid-gas mixture is cooled down in air cooler until NGL are transferred to liquid state, thereafter NGL are subject to separation in reflux tank and in centrifugal vertical gas separator, wherein from NGL water and light hydrocarbon gases are separated.

EFFECT: increased output of NGL due to reduced losses at pre-treatment.

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