METHOD FOR INCREASING OIL RECOVERY OF FORMATIONS Russian patent published in 2023 - IPC E21B43/27 

FIELD: oil industry.

SUBSTANCE: method includes the initial stop of water injection into the well, followed by the assembly of the injection line. Determine the preliminary injectivity of the well before treatment. A suspension of modified clay powder in water is pumped into the reservoir, then trisodium phosphate or “powdered sodium glass” is sequentially pumped, then a buffer slug of water in a volume of 5-10 m³ is pumped into the well, followed by pumping a solution of calcium chloride, followed by a buffer slug of water in the well of 5-10 m³, then a slug of a solution of trisodium phosphate or "powdered sodium glass" is pumped in.

EFFECT: isolating highly permeable interlayers for redistributing the filtration flows of injected water when regulating the process of developing oil deposits.

2 cl, 1 dwg, 2 tbl