VIBRATOR Russian patent published in 2006 - IPC E21B37/00 

FIELD: well equipment, namely, vibrators, creating pulsation of liquid in tubing strings for cleaning away paraffin during extraction of oil using fountain method or electric centrifugal pump plants.

SUBSTANCE: vibrator includes body with bushing mounted inside, piston and valve. In accordance to invention, vibrator contains upper and lower subs, wall and spring-loaded sliding block with crank, connected to valve. Piston is made spring-loaded, two-stepped and with tail piece. In the bushing, which is quiescently mounted inside the body, a valve is mounted on the axis. Body is made with aperture for connecting behind-pipe space to closed space, formed by wall and spring-loaded two-stepped piston. Tail piece of the latter can hold the crank in neutral position during decrease of pressure over two-stepped piston. Valve is made concave in working part.

EFFECT: provided excitation of liquid oscillations for cleaning away paraffin on internal surface of tubing strings.

3 dwg