Coupling for dual member pipe

Details Coupling for dual member pipe Coupling for dual member pipe

E - Fixed Constructions

21

B

E21B 17/02 (2006.01) E21B 7/04 (2006.01)

Patent

CA 2530398

A coupling assembly (100) to interconnect an inner member (40) and an outer member (42) of a dual member drill string in torque transmitting engagement is disclosed. The coupling assembly (100) is adapted to transmit torque input from both members (40, 42) to a downhole tool. In one embodiment, the coupling assembly comprises a connector sub (102) that fixedly and non-fixedly couples both members. In another embodiment, the coupling assembly comprises a clutch mechanism (138) to interconnect both members when the rotational speed of the outer member exceeds the rotational speed of the inner member. In another embodiment, the coupling assembly comprises a mechanism to couple both members (40, 42) by axial downhole movement of the inner member (40) relative to the outer member (42). In another embodiment, the coupling assembly comprises a planetary gear system (556, 562, 558) that interconnects both members to provide high torque to the downhole tool at relatively low output speed of the dual member drill string.

L'invention concerne un ensemble raccord (100) destiné à raccorder un élément interne (40) et un élément externe (42) d'un train de tiges à deux éléments en relation de transmission de couple. L'ensemble raccord (100) est conçu pour transmettre une entrée de couple des deux éléments (40, 42) à un outil de fond. Dans un mode de réalisation, l'ensemble raccord comprend un raccord sub (102) qui couple de manière fixe et non fixe les deux éléments. Dans un autre mode de réalisation, l'ensemble raccord comprend un mécanisme d'embrayage (138) qui raccorde les deux éléments lorsque la vitesse de rotation de l'élément externe est supérieure à celle de l'élément interne. Dans un autre mode de réalisation encore, l'ensemble raccord comprend un mécanisme destiné à coupler les deux éléments (40, 42) par un mouvement descendant axial de l'élément interne (40) par rapport à l'élément externe (42). Dans un autre mode de réalisation encore, l'ensemble raccord comprend un système d'engrenage planétaire (556, 562, 558) qui raccorde les deux éléments de façon à produire un couple élevé vers l'outil de fond à une vitesse de sortie relativement faible du train de tiges à deux éléments.

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