Method and apparatus for drilling with high-pressure,...

E - Fixed Constructions – 21 – B

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E21B 7/00 (2006.01) E21B 3/00 (2006.01) E21B 17/18 (2006.01) E21B 21/10 (2006.01) E21B 21/12 (2006.01) E21B 34/00 (2006.01)

Patent

CA 2207648

A drillstring terminating in an drill bit (3) is run into a borehole. A reduced solid content drilling fluid is pumped through the drillstring tubes and out the bit, wherein the drilling fluid impinges upon and disintegrates formation material in cooperation with the bit. An annulus fluid having a density greater than that of the drilling fluid is continuously pumped into the annulus (5) between the borehole and the drillstring, wherein the annulus fluid extends substantially from the surface to the bottom of the drillstring. Drilling fluid and cuttings resulting from disintegration of formation material are returned to the surface through a substantially unobstructed tubular passage (17) in the drillstring. The annulus fluid is maintained under a selected and controlled pressure in the annulus, wherein an interface is formed at the drill bit at which annulus fluid mixes with the drilling fluid and is returned along with the drilling fluid and cuttings, and drilling fluid is substantially prevented from entering the annulus.

Un train de tiges de forage se terminant par un outil de forage (3) est introduit dans un trou de forage. Un fluide de forage à contenu réduit en solides est pompé par les tubes du train de tiges et hors de l'outil de forage, où le fluide de forage frappe et désintègre le matériau de la formation en combinaison avec l'outil de forage. Un fluide annulaire dont la densité est supérieure à celle du fluide de forage est continuellement pompé dans l'annulaire (5) entre le trou de forage et le train de tiges, dans lequel le liquide annulaire va essentiellement de la surface jusqu'au bas du train de tiges. Le fluide et les déblais de forage provenant de la désintégration des formations sont évacués vers la surface par un passage tubulaire essentiellement non obstrué (17) dans le train de tiges. Le liquide de l'annulaire est maintenu à une pression choisie et contrôlée. Dans l'annulaire, une interface se forme à l'outil de forage où le fluide annulaire se mêle au fluide de forage et est évacué avec le fluide et les débris de forage, le fluide de forage est ainsi largement empêché d'entrer dans l'annulaire.

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