METHOD FOR TREATMENT OF INTERLAYER EMULSIFIED OIL IN TANKS AND VESSELS FOR WATER AND OIL PREPARATION Russian patent published in 2014 - IPC E21B43/34 B01D17/04 C10G33/00 

FIELD: oil and gas industry.

SUBSTANCE: method for treatment of interlayer emulsified oil in tanks and vessels for water and oil preparation includes placement of emulsified oil to a subsurface holding tank, dosing of oil solvent to the subsurface holding tank in the ratio from 1:100 up to 1:1 of the emulsified oil volume, pumping by a pump through a metering unit to the surface tank, delivery of demulsifying agent in dose of 50-5000 g/t at section from the pump up to the surface tank into the flow of pumped liquid by a dosing unit, heating the mix of emulsified oil, solvent and demulsifying agent in the heat exchanger, passage of the heated mix of complicated emulsified oil, solvent and demulsifying agent in the surface tank through the coiled heat exchanger, deflector of the liquid flow with layering into oil with solvent and water, separation of mechanical impurities, separate recovery of oil with solvent, water and mechanical impurities, delivery of oil with solvent depending on the permitted level of water content in crude oil flow for further preparation as per the conventional scheme at the oil preparation plant or for repeat treatment to the subsurface tank.

EFFECT: providing controlled process and increasing degree of emulsified oil layering.

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