Drilling a borehole

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 47/00 (2006.01) E21B 4/02 (2006.01) E21B 10/18 (2006.01) E21B 10/62 (2006.01)

Patent

CA 2506056

A method of drilling a borehole into a subsurface earth formation, using a tubular drill string which includes at its lower end a bottom hole assembly comprising a drill bit, a drill steering system, and a surveying system, wherein the drill string includes a passageway for an auxiliary tool from a first position interior of the drill string above the bottom hole assembly to a second position wherein at least part of the auxiliary tool is exterior of the drill string below the bottom hole assembly, which passageway can be selectively closed, and which method comprises drilling so as to progress the drill string into the earth formation, until a tool operating condition is met; opening the passageway; passing an auxiliary tool from the first position through the passageway to the second position, and operating the auxiliary tool at the second position.

L'invention concerne un procédé de forage d'un trou de sonde dans une formation d'un terrain dans une subsurface, au moyen d'un train de forage tubulaire comprenant, à son extrémité inférieure, un ensemble fond de sondage comprenant un trépan, un système de commande de forage, et un système d'arpentage. Le train de forage comprend un passage pour un outil auxiliaire, à partir d'une première position à l'intérieur du train de forage, au-dessus de l'ensemble fond de sondage, vers une seconde position où au moins une partie de l'outil auxiliaire est extérieure au train de forage au-dessous de l'ensemble fond de sondage, ledit passage pouvant être sélectivement fermé. Le procédé comprend le forage, permettant de faire progresser le train de forage dans la formation de terrain, jusqu'à ce qu'on rencontre des conditions de travail au moyen d'un outil ; l'ouverture du passage ; le passage d'un outil auxiliaire de la première position à travers le passage, vers la seconde position, et la mise en action de l'outil auxiliaire à la seconde position.

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