Expandable apparatus for drift and reaming a borehole

Details Expandable apparatus for drift and reaming a borehole Expandable apparatus for drift and reaming a borehole

E - Fixed Constructions

21

B

E21B 7/20 (2006.01) E21B 10/34 (2006.01) E21B 17/14 (2006.01)

Patent

CA 2407506

An expandable reamer shoe is provided for use with expandable casing in a borehole. The reamer shoe has a number of reaming members in the form of blades which remain closed against the body of the shoe when inserted through casing, and can then be expanded to underream below the casing. Additionally, the expandable reamer shoe is made substantially of a drillable material so that the borehole can be extended beyond the point reached by the expandable reamer shoe.

L'invention concerne un sabot d'alésage extensible destiné à être utilisé avec un tubage extensible dans un trou de forage. Ledit sabot d'alésage comporte une pluralité d'éléments d'alésage se présentant sous la forme de lames. Lesdites lames restent fermées contre le corps du sabot lors du passage au travers du tubage, et peuvent être déployées pour élargir le trou en dessous du tubage. Par ailleurs, le sabot d'alésage extensible est essentiellement réalisé dans un matériau forable de manière que le trou de forage puisse être approfondi au-delà du point atteint par le sabot d'alésage extensible.

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