Chamfered edge gage cutters, drill bits so equipped, and...

E - Fixed Constructions – 21 – B

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Details

E21B 10/567 (2006.01)

Patent

CA 2695620

A cutting element for an earth boring bit, wherein the PDC layer of the cutting element has a flat on a periphery thereof terminating longitudinally at en edge spaced from of the cutting face of the PDC layer. A chamfer adjacent the cutting face desirably has a length that exceeds its depth. Embodiments include a chamfer along the entire circumference of the cutting element, multiple step-wise, radially adjacent chamfers, and multiple circumferentially spaced portions of the uppermost radius of the PDC layer of the cutting element that each includes a chamfer with an associated flat. An embodiment including a flat terminating at a radial edge with the cutting face of a PDC layer is also disclosed, as are drill bits incorporating embodiments of the cutting elements of the invention and a method of forming the cutting elements.

L'invention concerne un élément de coupe destiné à un trépan, la couche de PDC de cet élément de coupe présentant sur sa périphérie un méplat se terminant longitudinalement sur un bord à distance de la face de coupe de la couche de PDC. Un chanfrein adjacent à la face de coupe présente avantageusement une longueur supérieure à sa profondeur. Des modes de réalisation comprennent un chanfrein sur toute la circonférence de l'élément de coupe, des chanfreins multiples étagés adjacents radialement et des parties multiples du rayon supérieur de la couche de PDC de l'élément de coupe, ces parties étant espacées circonférentiellement et comprenant chacune un chanfrein et un méplat associé. L'invention concerne également un mode de réalisation comprenant un méplat se terminant sur un bord radial par la face de coupe de la couche de PDC, ainsi que des trépans comprenant des modes de réalisation des éléments de coupe selon l'invention et un procédé de façonnage de ces éléments de coupe.

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