Drill bit and cutter element having aggressive leading side

Details Drill bit and cutter element having aggressive leading side Drill bit and cutter element having aggressive leading side

E - Fixed Constructions

21

B

E21B 10/08 (2006.01)

Patent

CA 2563188

A cutter element for a drill bit includes a leading cutting surface and a trailing cutting surface. The leading surface includes a top surface and a front surface that meet in a radiused intersection forming a forward-facing, non-linear crest of non-uniform radius. The radius of the crest is smallest at the forward-most portion, and greater at each end. The crest has its largest radius at a location between its forward-most portion and one of its ends. The cutter element may be employed in the corner cutting portion of a rolling cone cutter in a drill bit, the cutter element being positioned such that the forward-most portion of the crest first engages the formation material, with the crest end having the largest radius being closest to the pin end of the bit.

La présente concerne une tête de forage de trépan, qui comprend une surface de coupe antérieure et une surface de coupe postérieure. La surface antérieure comprend une surface sommitale et une surface de façade qui sont réunies en un point d'intersection arrondi de manière à former un sommet de filet non linéaire à arrondissement non uniforme. L'arrondi du sommet de filet est réduit dans la partie antérieure, tandis qu'il est plus évasé à chaque extrémité. Le plus grand arrondi du sommet de filet se trouve en un point situé entre la partie antérieure et l'une de ses extrémités. La tête de forage peut être disposée dans la partie de forage en angle d'un trépan à molettes, la tête de forage étant installée de telle façon que la partie antérieure du sommet du filetage pénètre d'abord les roches de la formation; la fin du filetage, compte tenu de son plus fort diamètre, se trouve la plus rapprochée de l'extrémité mâle du trépan.

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