E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/46 (2006.01)
Patent
CA 2505709
A cutter for a drill bit used for drilling wells in a geological formation includes an ultra hard working surface and a chamfer along an edge of the working surface, wherein the chamfer has a varied geometry along the edge. The average geometry of the chamfer varies with cutting depth. A depression in the shaped working surface is oriented with the varied chamfer and facilitates forming the varied chamfer. A non-planar interface has depressions oriented with depressions in the shaped working surface to provide support to loads on the working surface of the cutter when used.
Outil de coupe pour un trépan servant au forage de puits dans une formation géologique; l'outil comprend une surface de travail ultradure et un chanfrein le long du bord de la surface de travail, où le chanfrein comporte une géométrie variable le long dudit bord. La géométrie moyenne du chanfrein varie avec la profondeur de coupe. Une dépression sur la surface de travail profilée est orientée selon le chanfrein variable et facilite le formage du chanfrein variable. Une surface de contact planaire comporte des dépressions orientées avec les dépressions sur la surface de travail profilée afin d'assurer un appui aux contraintes exercées sur la surface de travail de l'outil de coupe lorsque ce dernier est utilisé.
Kristiansen Steffen S.
Shen Yuelin
Zhang Youhe
Borden Ladner Gervais Llp
Smith International Inc.
LandOfFree
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