SPRING CENTRALISER FOR WELL Russian patent published in 2012 - IPC E21B17/00 

FIELD: mining.

SUBSTANCE: spring centraliser for a well includes upper shell and lower shell with radial threaded holes. Spring planks are arranged between upper and lower shells and connected to the latter. Screws with external thread for threaded holes of lower shell for attachment of the latter to the body of the pipe on which there is spring centraliser setup. At that, lower shell has external upsets in the form of annular shoulder, around each threaded hole with diameter and height, which provide the possibility of attaching the lower shell with the required force to the body of the above pipe by means of screws. Those screws are provided with additional function of introduction of hydraulic disturbances to the condition of the well liquid in the zone of spring planks.

EFFECT: improving performance characteristics.

10 cl, 2 dwg