DEVICE FOR PULSE PUMPING OF LIQUID TO FORMATION Russian patent published in 2010 - IPC E21B28/00 E21B43/25 

FIELD: oil and gas industry.

SUBSTANCE: device for pulse pumping of liquid to formation includes housing, branch pipe with central channel, which is concentrically located in housing, and equipped with openings and a nut. Branch pipe is rigidly connected from above to reducer. Hollow cylindrical valve is rigidly connected from below to the branch pipe which is inserted in the housing with possibility of tight longitudinal movement. Spring is installed between nut and housing. In housing there is internal cylindrical recess below which there is lower cylindrical recess in the housing equipped with radial channels. In hollow cylindrical valve there are two rows of holes as to height, between which an internal plug is installed. Hollow cylindrical valve is equipped from above with annular projection provided with possibility of tight restricted downward movement relative to internal cylindrical recess of the housing. Cavity of internal cylindrical recess of the housing is interconnected above annular projection by means of openings with central channel, in which there arranged above openings is process constriction made in the form of replaceable sleeve installed inside central channel. Lower cylindrical recess of the housing is provided with possibility of being interconnected with lower row of through holes of hollow cylindrical valve.

EFFECT: increasing operating efficiency of the device.

1 dwg