DEVICE FOR GENERATING HYDRAULIC PRESSURE IMPULSES IN A WELL Russian patent published in 2004 - IPC

FIELD: oil extracting industry.

SUBSTANCE: device has driving assembly made in form of screw gear mechanism, stator of which has inner screw teeth, and rotor has outer screw teeth for interacting with inner screw teeth of stator. Flow interrupter is a valve connected to the rotor. End-cap has an aperture for flow of fluid. Device has a sub for connection to pipe column and also is provided with additional sub connected to screw gear mechanism. End-cap is placed in additional sub and made in form of piston mounted with capability for axial displacement, side portion of which has barrel-like shape. Additional sub and piston are made with apertures for placement of piston rotation limiters. In sub for connecting device to pipe column check valves are mounted: side valve for connecting hollow of said sub to behind-pipe space and central valve for connecting space of screw gear mechanism to hollow of said sub.

EFFECT: higher reliability and durability of device as well as higher effectiveness of bed treatment.

1 dwg