Method and apparatus for programmable pressure drilling and...

E - Fixed Constructions – 21 – B

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E21B 21/08 (2006.01)

Patent

CA 2711192

A method for creating a programmable pressure zone adjacent a drill bit bottom hole assembly by sealing near a drilling assembly, adjusting the pressure to approximately or slightly below the pore pressure of the well bore face to permit flow out of the formation, and, while drilling, adjusting by pumping out of, or choking fluid flow into, the drilling assembly between the programmable pressure zone and the well bore annulus to avoid overpressuring the programmable pressure zone un-less required to control the well.

La présente invention concerne un procédé de création d'une zone de pression programmable adjacente à un ensemble de fond à trépan qui consiste à effectuer une étanchéification à proximité d'un ensemble de forage, à ajuster la pression à une pression sensiblement égale ou légèrement inférieure à la pression hydrostatique du côté puits de forage pour permettre l'écoulement hors de la formation et, au cours du forage, à ajuster, par aspiration ou engorgement de l'écoulement de fluide à l'intérieur, l'ensemble de forage entre la zone de pression programmable et l'espace annulaire du puits de forage pour éviter la surpression de la zone de pression programmable sauf lorsque cela s'avère nécessaire pour commander le puits.

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