METHOD FOR COMPLETELY WASHING OUT RESIDUAL OIL BY INCREASING LAMINATED HETEROGENEOUS RESERVOIR SWEEP BY MEANS OF FLOODING THEREOF Russian patent published in 2005 - IPC

FIELD: oil producing industry, particularly enhanced recovery methods for obtaining hydrocarbons.

SUBSTANCE: method involves injecting dispersion of oil-soluble nonionic surfactant of oxyethylated alkyl phenol with 5-7 oxyethyl groups in mineralized water into reservoir through injection wells; forcing above dispersion of 1-2% concentration in amount of 750-1500 m³ per one well into reservoir with the use of mineralized water taken in amount of 1-2 well borehole volumes; sustaining technological time interval for 7-14 days.

EFFECT: increased efficiency of oil washing out with the use the dispersion of oxyethylated alkyl phenol in mineralized water due to increased reservoir sweep, reduced costs.

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