Steel tooth cutter element with gage facing knee

E - Fixed Constructions – 21 – B

Patent

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E21B 10/16 (2006.01) E21B 10/50 (2006.01)

Patent

CA 2232469

A steel tooth, particularly suited for use in a rolling cone bit, includes a root region, a cutting tip spaced from the root region and a gage facing surface therebetween. The gage facing surface includes a knee, and is configured such that the cutting tip is maintained at a position off the gage curve. So positioned, the cutting tip is freed from having to perform any substantial cutting duty in the corner on the borehole corner, and instead may be configured and optimized for bottom hole cutting duty. The knee on the gage facing surface is configured and positioned so as to serve primarily to cut the borehole wall. It is preferred that the knee be positioned off gage, but that it be closer to the gage curve than the cutting tip.

Dent en acier, conçue particulièrement pour un trépan à molettes, comprenant une base, un taillant d'extrémité espacé de la base de la dent et une surface tronconique de front de taille. Cette dernière comprend une arête et est configurée afin de maintenir le taillant d'extrémité en décalage par rapport à la surface tronconique. Le taillant d'extrémité ainsi placé n'a pas à effectuer de coupe substantielle dans l'angle du coin du trou de forage et peut être configuré et optimisé pour tailler le fond du trou. L'arête sur la surface tronconique de front de taille est configurée et placée pour servir principalement à tailler la paroi du trou de forage. Il est préférable de décaler l'arête par rapport à la surface tronconique tout en la plaçant plus près de la courbure tronconique que du taillant d'extrémité.

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