TUBING ANCHOR FOR ELECTRIC CENTRIFUGAL PUMP Russian patent published in 2012 - IPC E21B23/00 

FIELD: oil and gas production.

SUBSTANCE: device consists of upper and lower adapters, shaft with support ring rigidly fixed in its upper part, shock-absorbing unit with cone and anchoring mechanism located at the shaft with the possibility of interaction. At the shaft below the cone there is a cam slot that has axial short and long areas with guiding pin in it. The cone is made in a form of outer two-step annular recess. Anchoring mechanism is made in a form of a collet, spring-loaded from outside, with guiding pin. Longitudinal short and long areas of cam slot are interconnected by closed shaped area in such a way that in the course of collet reciprocating movement relatively the shaft the guiding pin will be located either in longitudinal short area of cam slot - transport position, when collet interacts with bottom end of the lower step of outer stepped annular recess of the cone, or in longitudinal long area of cam slot - operating position. The collet interacts with the bottom end of the upper step of outer stepped annular recess of the cone. Shock-absorbing element is made in a form of a compression spring. Between the shaft and upper adapter there installed is a sludge and cable bands catching chamber plugged from below.

EFFECT: increasing of operating stability of the device.

2 dwg