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US 9,869,131 B2Granted
Drill bit
AssigneeNOV Downhole Eurasia Limited
InventorsStephen Williams, Denise John, Ryan Graham
Life of this patent
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Abstract
A drill bit comprises at least one blade, comprising a plurality of cutting elements in the form of polycrystalline diamond cutters disposed on a leading edge of the blade, at least one diamond impregnated cutting region, disposed behind the leading edge of the blade, and wherein at least one of the cutters disposed on the leading, edge is an off-tip cutting element, arranged so that it does not engage with the formation during drilling until bit wear has taken place.
Claims15
A drill bit comprising:
- at least one blade, comprising:
- a plurality of cutting elements in the form of polycrystalline diamond cutters disposed on a leading edge of the blade;
- at least one diamond impregnated cutting region, disposed behind the leading edge of the blade,
- at least one of the cutters disposed on the leading edge being an off-tip cutting element, arranged so that it does not engage with the formation during drilling until bit wear has taken place;
- wherein the polycrystalline diamond cutters comprise compacts each including a substrate and a polycrystalline diamond table bonded thereto, the off-tip cutting element having a shorter substrate than at least some of the other cutting elements disposed on the leading edge.
2 more elements
Dependencies are inferred from the claim text.