Drill string anchor

Details Drill string anchor Drill string anchor

E - Fixed Constructions

21

B

E21B 4/18 (2006.01) E21B 23/04 (2006.01)

Patent

CA 2143735

A drill string anchor (1) for use in a well bore, the anchor having a body (11), a through bore (12) and a plurality of anchor assemblies (13), each assembly comprising an anchor member (20), a piston (2) supported within a body and a biassing means (3). The piston is radially movable in response to fluid pressure in the through bore between a first retracted position and a second extended position in which the piston drives the anchor member into contact with the wall of the well bore. The biassing means acts to provide a force biassing the piston towards the first retracted position.

Ancrage (1) de train de tiges utilisé dans un trou de puits, l'ancrage comprenant un corps (11), un trou traversant (12) et une série de dispositifs d'ancrage (13). Chaque dispositif compte un élément d'ancrage (20), un piston (2) soutenu à l'intérieur du corps et un mécanisme de compression (3). Le piston est mobile radialement en réaction à la pression du fluide dans le trou traversant entre une première position rentrée et une deuxième position sortie dans laquelle il met l'élément d'ancrage en contact avec la paroi du trou de puits. Le mécanisme de compression fonctionne de manière à fournir une force poussant le piston vers la première position rentrée.

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