Well drilling bit

Details Well drilling bit Well drilling bit

E - Fixed Constructions

21

B

E21B 10/20 (2006.01) E21B 10/62 (2006.01) E21B 47/00 (2006.01)

Patent

CA 2453038

A well drilling bit (1) comprising a bit body (8) attachable to a tubular drill string (3), which bit body (8) is internally provided with a passageway (18) providing fluid communication, when the drill string (3) is attached to the bit body (8), between the interior (19) of the drill string and the exterior (20) of the bit body (8); a closure element (25) for selectively closing the passageway (18); and one or more chip-making elements (11,12,13), wherein the chip-making elements (11,12,13) comprise one or more roller- cones (11,12,13), wherein the closure element is releasably connectable to the bit body, and outwardly movable from a closing position to an opening position, and wherein the closure element includes at least one of the roller-cones.

L'invention concerne un outil de forage de puits (1) qui comprend: un corps d'outil (8) pouvant être fixé à un train de forage tubulaire (3), et présentant un passage interne (18) de fluide, opérationnel lorsque le train (3) est relié au corps (8), entre l'intérieur (19) du train et l'extérieur (20) du corps (8); un élément de fermeture (25) assurant la fermeture sélective du passage (18); et un ou plusieurs éléments de taille en éclats (11,12,13), équipés d'une ou plusieurs molettes. L'élément de fermeture est relié amovible au corps, et il peut être déplacé vers l'extérieur, depuis une position de fermeture vers une position d'ouverture. Cet élément de fermeture comprend au moins l'une des molettes.

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