HYDROPERCUSSION DEVICE Russian patent published in 2016 - IPC E21B21/14 E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: hydropercussion device for cleaning the wellbore from sand and clay tube consists of the housing assembly, the saddle with longitudinal grooves, connecting fitting with an annular piston arranged in the housing of the compensator, a spring-loaded pusher end flap with the rod and the crown, the nut on the lower end of the housing assembly. Apparatus is provided with a restrictive washer placed beneath the crown and the related nut pins freely through a hole in the crown, the body of which is made to cover the inner groove bounding the washer at the time of the stroke, the body bounding the washer central bore.

EFFECT: application of the device in the production tubing of small inner diameter of the pipes can effectively transport mechanical impurity to the surface through the annulus.

1 cl, 3 dwg