HYDRODYNAMIC PULSATOR Russian patent published in 2012 - IPC E21B28/00 

FIELD: machine building.

SUBSTANCE: proposed device comprises body with openings, seat, spring-loaded valve with bush, spring-loaded piston fitted in bush axial channel, lower cover and damping channel. Piston comprises hollow rod with restrictor arranged in axial channel. Said lower cover is furnished with needle to make movable joint with restrictor. Said body is provided with retainer. Piston spring is fitted in annular clearance between bush and hollow rod to rest upon bush inner annular ledge. Piston is fitted in bush axial channel to have face contact with additional mounting face on aforesaid seat. Body is arranged in axial channel of outlet pipeline provided with lateral outlet branch pipe to allow constant hydraulic communication between body axial channel above lower cover and outlet branch pipe inner chamber.

EFFECT: expanded operating performances, higher well production rate.

2 dwg