Graded hardfacing for drill bits

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 10/08 (2006.01) B05D 5/00 (2006.01) E21B 10/46 (2006.01)

Patent

CA 2551393

A drill bit including a bit body having an upper end adapted to be detachably secured to a drill string and at least one leg at its lower end, each leg having a downwardly and inwardly extending journal bearing, at least one roller cone mounted on each journal bearing, at least one cutting element disposed on the at least one roller cone; and a hardfacing overlay on at least a portion of at least one of an inner surface of the at least one roller cone and a surface of the journal bearing, wherein a composition of the hardfacing overlay proximate an outside surface of the hardfacing overlay is different from a composition of the hardfacing overlay proximate an interface between the hardfacing overlay and the at least a portion of at least one of the inner surface of the at least one roller cone and the surface of the journal bearing is disclosed.

L'invention concerne un taillant doté d'un corps dont l'extrémité supérieure est adaptée à être fixée de manière amovible à une rame de forage et au moins une jambe à son extrémité inférieure ayant un palier lisse qui s'étend vers le bas et vers l'intérieur, au moins un cône à molettes sur chaque pallier lisse, au moins un élément de coupe disposé sur au moins un cône à molettes; et un recouvrement à rechargement dur sur au moins une partie d'au moins une face intérieure d'au moins un cône à molettes et d'un face du palier lisse. La composition du recouvrement à rechargement dur près d'une face extérieure du recouvrement à rechargement dur est différente de celle du recouvrement à rechargement dur près d'une interface entre le recouvrement à rechargement dur et au moins une partie d'au moins une face intérieure d'au moins un cône à molettes et d'une face du palier lisse.

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