METHOD OF RAISING OIL RECOVERY FROM HORIZONS BY MEANS OF PUMPING WATER-GAS MIXTURE INTO HORIZON Russian patent published in 2009 - IPC E21B43/16 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas producing industry, particularly to methods of driving oil from horizon by means of pumping physic-chemical substances. Water-gas mixture is prepared. It is pumped into one ore more wells with pump centrifugal installation allowing presence of free gas in pumped water-gas mixture within the range facilitating stable operation of the said installation. Oil is driven from the payout horizon. Oil driving from the payout horizon is performed with water gas mixture with contents of gas in this mixture within the range from 30 to 75% of volume of mixture under condition of oil driving; for this purpose there is performed separation of excess water from water-gas mixture with a separator at the outlet of the centrifugal pump installation and before pumping water-gas mixture into wells. Water-gas mixture is further supplied into a suction collector of the centrifugal pump installation.

EFFECT: simplifying the process and simultaneously increasing efficiency of pumping working agent into horizon to maintain horizon pressure.

1 dwg, 1 ex