Drill bits and other downhole tools with hardfacing having...

Details Drill bits and other downhole tools with hardfacing having... Drill bits and other downhole tools with hardfacing having...

E - Fixed Constructions

21

B

E21B 10/46 (2006.01) E21B 10/50 (2006.01) E21B 10/54 (2006.01)

Patent

CA 2674505

A hardfacing is provided to protect surfaces of drill bits and other downhole tools. The hardfacing may include tungsten carbide particles or pellets formed with an optimum weight percentage of binding material and dispersed within and bonded to a matrix deposit. The tungsten carbide particles may be formed by sintering or other appropriate techniques. The tungsten carbide particles may have generally spherical shapes, partially spherical shapes or non-spherical shapes.

Selon l'invention, un rechargement dur est réalisé afin de protéger des surfaces de trépans et autres outils de forage. Le rechargement peut comprendre des particules ou des granules de carbure de tungstène constituées d'un agglomérant selon un pourcentage pondéral optimal, et dispersées à l'intérieur d'une couche de base à laquelle elles sont fixées. Les particules de carbure de tungstène peuvent être formées par frittage ou par d'autres techniques appropriées. Les particules de carbure de tungstène peuvent présenter des formes généralement sphériques, des formes partiellement sphériques ou des formes non sphériques.

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