Braking device for tool strings

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 23/01 (2006.01) E21B 23/04 (2006.01) E21B 40/00 (2006.01)

Patent

CA 2409855

An embodiment of the invention discloses a restraint mechanism (12) of a braking device (10) for location in tubing (16) such as the casing of an oil or gas well. The braking device (10) forms part of a tool string which is run into the tubing (16) on a wireline and, in the event that the wireline breaks or is severed, the braking device (10) and the associated tool string falls through the tubing. The restraint mechanism (12) includes a sensor assembly (18), and a brake mechanism (22). The sensor assembly (18) senses the uncontrolled movement and provides an appropriate output causing activation of the brake mechanism (22), bringing the braking device (10) and tool string to a controlled stop.

Un mode de réalisation de l'invention décrit un mécanisme de retenue (12) d'un dispositif de freinage (10) destiné à être placé dans des tubes (16) tels que le tubage d'une source de pétrole ou de gaz. Le dispositif de freinage (10) fait partie d'un chapelet d'outils de forage que l'on fait passer par les tubes (16) à l'extrémité d'un câble; en cas de rupture ou de coupure du câble, le dispositif de freinage (10) et le chapelet d'outils y associé tombent à l'intérieur des tubes. Le mécanisme de retenue (12) comprend un ensemble de détecteurs (18) et un mécanisme de freinage (22). L'ensemble de détecteurs (18) détecte le mouvement non contrôlé et fournit une sortie appropriée en activant le mécanisme de freinage (22), ce qui a pour effet d'arrêter de façon contrôlée le dispositif de freinage (10) et le chapelet d'outils.

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