Clamping well casings

Details Clamping well casings Clamping well casings

E - Fixed Constructions

21

B

E21B 17/08 (2006.01)

Patent

CA 2545585

A clamp for clamping two concentric tubes, typically two concentric tubes in an oil or gas well. The clamp has two axially movable tapered components which can be pulled over one another in an axial direction to provide a contraction of internal diameter which grips the smaller diameter tube. In one embodiment, a spacer is fitted to allow the tapered components to be held apart until the tubes have been correctly positioned. The spacer is then removed, and the tapered components are drawn together to effect the clamping. A hydraulic ram can be provided to separate the tapered components should readjustment be required. In another embodiment, the larger diameter tube is made with a relatively thin wall, so that it can be distorted inwards to grip the smaller tube.

L'invention concerne une bride de serrage servant à serrer deux tubes concentriques (30 et 32), généralement dans un puits de pétrole ou un puits de gaz. La bride de serrage comprend deux composants effilés à déplacement axial (8) qui peuvent être disposés l'un sur l'autre par traction dans une direction axiale pour engendrer une contraction du diamètre interne et ainsi serrer le tube présentant le plus petit diamètre (32). Dans un mode de réalisation de cette invention, un espaceur (12) est mis en place pour maintenir les composants effilés (8) à une distance l'un de l'autre, jusqu'à ce que les tubes (30 et 32) soient positionnés correctement. L'espaceur (12) est ensuite retiré, et les composants (8) sont tirés l'un vers l'autre pour induire un serrage.

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