Earth-boring rotary drill bits including bit bodies having...

E - Fixed Constructions – 21 – B

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E21B 10/42 (2006.01) E21B 10/50 (2006.01) E21B 10/54 (2006.01)

Patent

CA 2668192

Rotary drill bits (10) for drilling subterranean formations include a bit body (12) and at least one cutting structure (34) disposed on a face (18) thereof. The bit body includes a crown region (14) comprising a particle-matrix composite material (52) that includes a plurality of boron carbide particles (50) dispersed throughout an aluminum or aluminum-based alloy matrix material. In some embodiments, the matrix material may include a continuous solid solution phase and a discontinuous precipitate phase. Methods of manufacturing rotary drill bits for drilling subterranean formations include infiltrating a plurality of boron carbide particles with a molten aluminum or aluminum-based material. In additional methods, a green powder component is provided that includes a plurality of particles each comprising boron carbide and a plurality of particles each comprising aluminum or an aluminum-based alloy material. The green powder component is at least partially sintered to provide a bit body, and a shank is attached to the bit body.

L'invention concerne des trépans rotatifs de forage (10) pour forer des formations souterraines comprenant un corps de trépan (12) et au moins une structure de coupe (34) disposée sur une face (18) de ce corps. Le corps de trépan comprend une partie en couronne (14) qui contient un matériau composite (52) à matrice et particules qui contient une pluralité de particules (50) de carbure de bore dispersées dans un matériau de matrice en aluminium ou alliage à base d'aluminium. Dans certains modes de réalisation, le matériau de matrice peut contenir une phase continue de solution solide et une phase discontinue de précipité. Les procédés de fabrication de trépans rotatifs destinés à forer des formations souterraines comprennent l'imprégnation d'une pluralité de particules de carbure de bore par un matériau fondu d'aluminium ou à base d'aluminium. Dans des procédés supplémentaires, on prévoit un composant de poudre crue qui contient une pluralité de particules qui contiennent toutes du carbure de bore et une pluralité de particules qui contiennent toutes de l'aluminium ou un matériau d'alliage à base d'aluminium. Le composant de poudre crue est fritté au moins en partie pour fournir un corps de trépan et une tige est attachée au corps de trépan.

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