SYSTEM AND METHOD OF SEPARATING MIXTURE CONTAINING TWO FLUID PHASES AT LEAST PARTIALLY NON-MIXED WITH EACH OTHER AND HAVING DIFFERENT SPECIFIC DENSITY, IN PARTICULAR, FOR DOWNHOLE USE Russian patent published in 2016 - IPC B01D17/04 C10G33/06 E21B43/34 

FIELD: mining.

SUBSTANCE: invention relates to production of hydrocarbons. Separated is a mixture containing two fluid phases at least partially non-mixed with each other and with different specific densities. Said mixture is introduced into system 10 for separation and subjected to the first coarse separation stage using gravity. First portion of the flow enriched with oil (a fluid phase with low specific density) and a fluid phase with high specific density are obtained. First part of the flow enriched with oil is fed into upper outlet 12a of system 10 for separation. Fluid phase with high specific density Is subjected to at least one stage of fine separation. Obtained second part of the flow enriched with oil is fed into upper outlet 12a of system 10 for separation and the water flow - into lower outlet 12b of system 10 for separation.

EFFECT: invention enables efficient and compact use of the system for separation inside wells, separation of fluid flows into oil products and water with high degree of purity and reduction of oil well injection capacity in case of reverse injection of water.

18 cl, 5 dwg