Expandable reamers for earth-boring applications and methods...

E - Fixed Constructions – 21 – B

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Details

E21B 10/32 (2006.01) E21B 7/28 (2006.01) E21B 17/10 (2006.01)

Patent

CA 2671423

Expandable reamer tools include an outer body (16), a fluid passageway (17) extending through the outer body, and at least one blade (40) configured to slide relative to the outer body between a retracted position and an expanded position in a direction oriented at an acute angle of less than ninety degrees (90-) to a longitudinal axis of the outer body. In some embodiments, the tools may include a moveable inner sleeve member (30) configured to selectively allow hydraulic fluid pressure within the fluid passageway to act directly on the at least one blade (40). Methods for enlarging a borehole using such expandable reamer tools and methods for removing such expandable reamer tools from a borehole are also disclosed.

La présente invention concerne des outils d'alésage extensibles qui incluent un corps externe (16), un conduit de fluide (17) s'étirant à travers le corps externe, et au moins une lame (40) configurée pour coulisser par rapport au corps externe entre une position rétractée et une position déployée dans une direction orientée à un angle aigu de moins de quatre-vingt-dix degrés (90-) par rapport à un axe longitudinal du corps externe. Dans certains modes de réalisation, les outils peuvent inclure un élément de manchon interne mobile (30) configuré pour permettre de manière sélective à la pression du fluide hydraulique à l'intérieur du conduit de fluide d'agir directement sur au moins une lame (40). L'invention concerne également des procédés pour agrandir un forage utilisant de tels outils d'alésage extensibles et des procédés pour retirer de tels outils d'alésage extensibles d'un forage.

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