HYDROCARBONS PRODUCTION INTENSIFICATION METHOD FROM FORMATIONS Russian patent published in 2019 - IPC E21B43/25 E21B43/16 

FIELD: mining.

SUBSTANCE: invention relates to methods of intensifying production of hydrocarbons from formations with excitation of self-oscillations in them using elastic formation energy. Method includes creation of cavity in productive formation by cyclic increase and reduction of fluid pressure in well. Well is filled with a liquid, the compressibility value of which is higher than that of the liquid in the well. Expansion and compression of cavity is performed by cyclic increase and reduction of pressure in well. Cycles are repeated in self-oscillation mode, at that providing constant flow of liquid into the well, which is divided into two parts, one of them is swirled to create a vortex and blows from the well its central part, and peripheral part of vortex together with second part of constant flow is directed into cavity of productive formation. Under the action of elastic forces there is a reverse movement of fluid from the formation, reduced volume of the cavity and deceleration of the vortex. Fluid pours from the well by cleaning the filtration channels. Then the vortex restores its rotation, and the process of action is resumed. Periods of cycles, value of volume of cavity in productive formation, as well as value of compressibility of liquid in formation are controlled by value of constant flow of liquid into well.

EFFECT: increased production of hydrocarbons from formations due to efficient cleaning of filtration channels and increased area of hydrocarbon influx.

6 cl, 1 dwg