Impact resistant pdc drill bit

Details Impact resistant pdc drill bit Impact resistant pdc drill bit

E - Fixed Constructions

21

B

E21B 10/46 (2006.01)

Patent

CA 2528560

A drill bit includes at least two different sets of cutting elements, each being the primary cutting set corresponding to a different formation. Upon encountering a significant change in formation characteristics, the first set of cutting elements may be sacrificed so that the second set of cutting elements becomes exposed, preventing the need to replace the drill bit immediately. The sets of cutting elements differ from one another, with each adapted to cut a different formation. The differences may include material toughness (impact resistance), bevel size, abrasion resistance, or backrake angle. Additional sets of cutting elements may be added to correspond to other formations or to otherwise improve performance.

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