DEVICE FOR PULSE ACTION ON RESERVOIR Russian patent published in 2016 - IPC E21B28/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry and can be used in development of oil deposits for pulse impact on bottom hole zone to increase reservoir recovery. Device includes housing with radial channel, which is concentrically located in casing pipe with central channel, openings, nut and is rigidly connected with adapter, cylindrical valve and spring. Branch pipe is rigidly fixed relative to body and forms with it hydro chamber. Cylindrical valve is arranged inside sleeve, which is equipped with lower, middle and upper rows of holes. Inside sleeve there are upper and lower cylindrical recesses. Lower row of holes of branch pipe communicated with space under differential piston installed in pipe below said valve and spring-loaded below nut by additional spring. In lower cylindrical recess of branch pipe there is differential piston top part, and in central channel is lower part of differential piston. Differential piston has possibility of opening and closing of lower row of holes of branch pipe with limited axial displacement relative to branch pipe. Middle row of holes of branch pipe communicated with space under cylindrical valve. Cylindrical valve is made two staged spring-loaded from below of branch pipe. Upper step of valve is located in central channel below openings of branch pipe, while bottom step in upper cylindrical sample valve to open and close upper row of holes of branch pipe with limited axial movement of valve relative to branch pipe. From above to differential piston is rigidly connected rod having possibility of interaction with cylindrical valve. Upper row of holes of branch pipe with help of sleeves and additional radial channels made in case is communicated with annular space. In branch pipe above lower row of holes, but below lower cylindrical recess there is additional radial channel, communicating by means of hollow rod and radial channel of housing with annular space. Adapter is equipped with check valve passing from outside to inside of device.

EFFECT: higher reliability and resource of operation of device to failure, expansion of technological capabilities of operation.

1 cl, 2 dwg