Earth-boring tools attachable to a casing string and methods...

E - Fixed Constructions – 21 – B

Patent

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E21B 7/20 (2006.01) E21B 10/42 (2006.01) E21B 10/64 (2006.01)

Patent

CA 2705565

Casing bits include a crown having a substantially hollow interior. The bit crown has blades over a face portion thereof, the blades including a plurality of cutting elements attached thereto. The bit crown further includes a composite inlay (85) positioned at least within the substantially hollow interior. Casing bits also include case hardened outer surfaces radially outside the drill-out region. Casing bits further include short- substrate cutting elements. Methods of forming a casing bit are also disclosed.

L'invention concerne des trépans de tubage comprenant une couronne présentant un intérieur sensiblement creux. La couronne de trépan comporte des lames sur sa partie face, une pluralité d'éléments coupants étant fixés sur ces lames. La couronne de trépan comprend également une incrustation composite disposée au moins dans l'intérieur sensiblement creux. Les trépans de tubage selon l'invention comprennent également un des surfaces externes cémentées situées radialement à l'extérieur de la zone de forage, ainsi que des éléments coupants à substrat court. L'invention concerne également des procédés de fabrication de trépan de tubage.

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