Shock tool for use in directional drilling

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/08 (2006.01) E21B 17/07 (2006.01)

Patent

CA 2184665

A shock tool includes a first tubular member, a second tubular member and a third tubular member. The first tubular member has an interior bore that extends between a first end and a second end. The second tubular member has an interior bore that extends between a first end and a drive linkage attachment end. The second tubular member is rotatably supported by both radial and thrust bearings within the interior bore of the first tubular member with the drive linkage attachment end protruding from the second end of the first tubular member. The third tubular member has an interior bore that extends between a bit connection end and a second end. The second end of the third tubular member being telescopically received within the interior bore at the first end of the second tubular member with the bit connection end protruding. The third tubular member is capable of limited reciprocal movement relative to the second tubular member. Shock absorbing medium is disposed between the third tubular member and the second tubular member. This shock tool has the ability to bear radial and thrust loads, in addition to shock loading.

Outil amortisseur de chocs comprenant trois éléments tubulaires. Le premier élément tubulaire est percé à l'intérieur, d'une extrémité à l'autre. Le deuxième élément tubulaire est percé à l'intérieur, de sa première extrémité jusqu'à l'extrémité de raccordement de la biellette d'entraînement. Il est supporté, de manière à pouvoir tourner, par des paliers radiaux et des paliers de butée dans le trou intérieur du premier élément tubulaire, l'extrémité de raccordement de la biellette d'entraînement ressortant de la deuxième extrémité du premier élément tubulaire. Le troisième élément tubulaire est percé à l'intérieur entre l'extrémité de raccordement d'un trépan et une deuxième extrémité. La deuxième extrémité du troisième élément tubulaire pénètre dans le trou intérieur à la première extrémité du deuxième élément tubulaire, l'extrémité de raccordement du trépan étant en saillie. Le troisième élément tubulaire peut exécuter un mouvement réciproque limité par rapport au deuxième élément tubulaire. Un élément amortisseur est placé entre le troisième élément tubulaire et le deuxième. L'outil amortisseur de chocs peut supporter des charges radiales et axiales et résister aux vibrations.

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