METHOD OF DEVELOPING AN OIL DEPOSITE Russian patent published in 2021 - IPC E21B43/22 C09K8/584 

FIELD: oil industry.

SUBSTANCE: invention relates to the oil industry and can be used in the development of oil deposits, including exhausted ones with both terrigenous and carbonate reservoirs. The method involves injecting a working agent into injection wells and extracting oil from producing wells. Among the producing wells, at least one well is chosen in a row of wells with the lowest flow rate: with a decrease in reservoir pressure in it by 2 times, and/or with an increased up to 99% water cut in it, and/or to increase the flow rate of oil in it. At least one selected production well is transferred to the injection well. Through this well, a rim with a buffer liquid is pumped into the reservoir, containing at least two sequentially injected rims: a rim of spent-soap lye and at least one rim of a flow-deflecting composition. This composition contains a reagent selected from the group: polymer-dispersed composition, viscoelastic composition, cross-linked polymer composition, gel-forming compositions, and polymer-gel systems. The mentioned rimes are pumped into the injection well in 5-8 cycles with an injection volume of 100-200 m³ per 1 m of the reservoir working thickness. In this case, the spent-soap lye has the following composition, in weight %: fatty acids 0.15-5.50; caustic soda 0.14-5.50; soda ash 0.8-10.00; the rest is for water.

EFFECT: technical result is increased oil recovery of productive reservoirs, excluding increased water cut of producing wells along the site and unproductive water filtration, reducing energy costs and the complexity of the technological process.

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