RECOVERY METHOD OF MULTIPLE ZONE OIL DEPOSITS WITH HYDRODYNAMICALLY RELATED RESERVOIRS Russian patent published in 2017 - IPC E21B43/14 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: method includes the deposit drilling by the downholes, reservoir limit test with permeability variations. Then provide the packer setting at the specified boundary and equipment for dual recovery from the production downholes. After that based on the core sample tests of the recovery deposit, the working agent for waterflooding is formed, containing the suspended particles with concentration and size, which provide the low permeable reservoir filtration channels blocking. Further the deposit is developed in three stages. At the first stage, the water is injected into both reservoirs, which has passed the routine preprocessing and does not reduce the reservoirs permeability, with simultaneous products selection from the production downholes and stop the pumping, if the water cut value reached 85%. At the second stage, the products selection is performed from both production downholes. In the injection wells, the low-permeable reservoir is preliminarily insulated with simultaneous-separate equipment and injects into the highly permeable reservoir of the waterflooding agent until it breaks to the bottom hole of the recovery downhole. At the third stage, the water injection, that has passed the routine preprocessing and does not reduce the reservoir permeability is repumped into the low-permeability reservoir and the working agent is pumped into the high-permeability reservoir, when the operating mode is realized, that provides the pressure maintaining in the high-permeability reservoir, higher than in the low-permeable one.

EFFECT: increase of the sweep efficiency due to the formation of the low filtration properties zone at the boundary between the reservoirs and separation of the hydrodynamical bounded reservoirs in the interwell space.

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