Cutting element structure for roller cone bit

Details Cutting element structure for roller cone bit Cutting element structure for roller cone bit

E - Fixed Constructions

21

B

E21B 10/08 (2006.01) B21K 5/02 (2006.01) B23P 15/28 (2006.01)

Patent

CA 2479337

A roller cone drill bit includes a bit body adapted to be coupled to a drill string, a bearing journal depending from the bit body, and a single roller cone rotatably attached to the bearing journal. The single roller cone has a plurality of cutting elements, where at least one of the plurality of cutting elements is formed of an inner region that is at least partially surrounded by an outer region, where the inner region is more abrasive resistant than the outer region. Such an arrangement in a single roller cone bit allows the at least one cutting element to be "self sharpening."

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