Perforating gun brake

Details Perforating gun brake Perforating gun brake

E - Fixed Constructions

21

B

E21B 43/116 (2006.01)

Patent

CA 2185077

A perforating gun brake includes a tubular housing, an annular piston and a mandrel. A first end of the piston is telescopically received in an interior bore at a second end of the tubular housing. The mandrel extends through an interior bore of the piston into the interior bore of the tubular housing. An hydraulic fluid chamber is formed in the interior bore of the tubular housing. A spring biases the piston toward a first end of the mandrel. The movement of the piston along the mandrel is resisted by hydraulic fluid in the hydraulic fluid chamber. An explosive charge is positioned on a first sealing assembly for the hydraulic chamber. Several gripping members are pivotally mounted to an exterior surface of the piston. The gripping members are movable between a retracted position and a deployed position. The gripping members are moved to the deployed position by a deploying collar that is released in response to pressure exerted upon detonation of the perforating gun. The deploying collar holds the gripping members in the deployed position until the first sealing assembly is removed by detonation of the charge, thereby allowing hydraulic fluid to escape from the hydraulic chamber. As the hydraulic chamber is emptied of hydraulic fluid the piston moves along the mandrel. The movement of the piston along the mandrel moves the gripping members away from the deploying collar allowing the gripping members to return to the retracted position.

Cette invention concerne un frein de perforateur qui comprend un corps tubulaire, un piston annulaire et un mandrin. Une première extrémité du piston est logée en ajustement coulissant dans un alésage axial ménagé dans la deuxième extrémité du corps tubulaire. Le mandrin, logé dans l'alésage axial du piston, se prolonge dans l'alésage axial du corps tubulaire. Une chambre de liquide hydraulique est ménagée dans l'alésage axial du corps tubulaire. Un ressort pousse le piston vers une première extrémité du mandrin. Le liquide hydraulique qui se trouve dans la chambre de liquide hydraulique s'oppose au mouvement du piston le long du mandrin. Une charge explosive est placée sur le premier obturateur étanche de la chambre de liquide hydraulique. Plusieurs éléments de freinage articulés sont disposés sur la surface extérieure du piston. Ces éléments de freinage sont mobiles entre une position escamotée et une position déployée. Ils sont déployés par un collier de déploiement qui est libéré par l'onde de pression accompagnant le tir du perforateur. Le collier de déploiement maintient les éléments de freinage en position déployée jusqu'à la détonation de la charge explosive et la rupture du premier obturateur étanche de la chambre de liquide hydraulique, ce qui permet audit liquide de s'échapper. € mesure que ladite chambre se vide, le piston avance le long du mandrin et, ce faisant, éloigne les éléments de freinage du collier de déploiement, autorisant l'escamotage desdits éléments.

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