Injecting a fluid into a borehole ahead of the bit

Details Injecting a fluid into a borehole ahead of the bit Injecting a fluid into a borehole ahead of the bit

E - Fixed Constructions

21

B

E21B 10/62 (2006.01) E21B 10/60 (2006.01) E21B 21/10 (2006.01)

Patent

CA 2454388

A method and system for introducing a fluid into a borehole (2), in which there is arranged a tubular drill string (3) including a drill bit (1), wherein the drill bit (1) is provided with a passageway (8, 20) between the interior (3a) of the drill string (3) and the borehole (2), and with a removable closure element (10) for selectively closing the passageway in the passageway in a closing position, and wherein there is further provided a fluid injection tool comprising a tool inlet and a tool outlet, the method comprising passing the fluid injection tool through the drill string to the closure element, and using it to remove the closure element from the closing position; passing the fluid injection tool outlet through the passageway, and introducing the fluid into the borehole from the interior of the drill string through fluid injection tool into the borehole.

L'invention concerne un procédé et un système d'injection d'un liquide dans un trou de forage (2) dans lequel est installé un train de forage tubulaire (3) comprenant un trépan (1). Le trépan (1) présente un conduit (8, 20) situé entre l'intérieur (3a) du train de forage (3) et le trou de forage (2), et un élément de fermeture amovible (10) pouvant fermer sélectivement le conduit en le plaçant dans une position de fermeture. Le système comprend également un outil d'injection de liquide présentant un orifice d'entrée et un orifice de sortie. Le procédé consiste à introduire l'outil d'injection de liquide dans le train de forage et l'utiliser pour atteindre l'élément de fermeture et le retirer de la position de fermeture. Le procédé consiste ensuite à introduire l'outil d'injection de liquide dans le conduit, puis à injecter le liquide dans le trou de forage de l'intérieur du train de forage à travers l'outil d'injection de liquide.

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