Multiphase drilling systems and methods

Details Multiphase drilling systems and methods Multiphase drilling systems and methods

E - Fixed Constructions

21

B

E21B 21/08 (2006.01)

Patent

CA 2734461

In one embodiment, a method for drilling a wellbore includes injecting drilling fluid through a drill string disposed in the wellbore and rotating a drill bit disposed on a bottom of the drill string. The drilling fluid includes a liquid and a gas. The drilling fluid is injected at the surface. The drilling fluid exits the drill bit and carries cuttings from the drill bit. The drilling fluid and cuttings (returns) flow to the surface via an annulus formed between the drill string and the wellbore. The liquid is injected at a rate so that a liquid velocity of the returns in the annulus is sufficient to transport the cuttings. The method further includes drilling through at least a portion of a non-productive formation.

Dans un mode de réalisation de linvention, un procédé de forage dun trou de forage comprend les étapes consistant à injecter un fluide de forage par un train de tiges disposé dans le trou de forage et entraîner en rotation un trépan disposé sur une extrémité inférieure du train de tiges. Le fluide de forage comprend un liquide et un gaz. Le fluide de forage est injecté à la surface. Le fluide de forage sort par le trépan et il entraîne des déblais de forage arrachés par le trépan. Le fluide de forage et les déblais de forage (fluide de retour) remontent à la surface via un espace annulaire formé entre le train de tiges et le trou de forage. Le liquide est injecté à un débit tel quune vitesse découlement du fluide de retour dans lespace annulaire suffit à transporter les déblais de forage. Le procédé comprend en outre le forage à travers au moins une partie dune formation non productrice.

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