Roller sub

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 17/10 (2006.01)

Patent

CA 2449424

The present invention provides a roller sub for use downhole in oil or gas wells as part of a toolstring or drill string to reduce friction between the string and wellbore. The roller sub is a modular assembly of parts which assemble together to trap the roller wheels in place between them, avoiding need for grub screws to fasten the individual wheels and rendering the roller sub very compact.

La présente invention concerne une réduction à galets destinée à l'utilisation en conditions de fond dans des puits de pétrole ou de gaz comme partie d'un chapelet d'outils de forage ou d'un train de tiges pour réduire la friction entre le chapelet d'outils de forage ou le train de tiges et le puits de forage. La réduction à galets est un ensemble modulaire d'éléments qui sont assemblés pour maintenir les galets mutuellement en place, ce qui rend superflu les vis de blocage destinées à la fixation des différents galets et permet d'obtenir une réduction à galets très compacte.

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