Automatic self energizing stop collar

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 23/00 (2006.01) E21B 19/10 (2006.01)

Patent

CA 2258950

An apparatus for engagement of cylindrical member (7) about the outside diameter, so that downhole tools may be positioned longitudinally along said cylindrical member. A generally cylindrical outer ring (1) is detachably engaged with a generally cylindrical inner ring (2). Once the inner ring (2) is detached from the outer ring (1) it is automatically present into position by a spring clamping force exerted between the pipe (7) and inner ring. Relative axial motion of the outer ring (1) with respect to the inner ring (2) automatically energizes the inner ring inward providing the high clamping force required to set the self energizing stop collar in its final position.

Un appareil pour la prise d'éléments cylindriques par leur surface extérieure de façon à positionner des outils de fond de trou dans le sens longitudinal le long d'un tel élément cylindrique. Une bague interne, de forme générale cylindrique, s'emboîte de façon amovible, dans une bague externe de forme générale cylindrique. Dès que la bague interne est enlevée de la bague externe, elle se met automatiquement en position sous l'effet d'une force de serrage de type ressort exercée entre le tuyau et la bague interne. Tout mouvement longitudinal de la bague externe par rapport à la bague interne crée automatiquement une énergie qui se transmet vers l'intérieur à la bague interne fournissant ainsi la force de serrage élevée nécessaire pour placer le collier d'arrêt autoserrant dans sa position définitive.

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