Superabrasive cutting elements with cutting edge geometry having enhanced durability, method of producing same, and drill bits so equipped
AssigneeBaker Hughes Incorporated
InventorsJeffrey B. Lund, Danny E. Scott, Marcus R. Skeem
Life of this patent
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Abstract
A superabrasive cutting element including a diamond or other superabrasive material table having a peripheral cutting edge defined by at least two adjacent chamfers having an arcuate surface substantially tangent to each of the at least two chamfers interposed therebetween. Methods of producing such superabrasive cutting elements and drill bits equipped with such superabrasive cutting elements are also disclosed.
Claims30
A cutting element for use on a rotary drill bit for drilling subterranean formations, comprising:
- a substantially planar table of superabrasive material having a face, a side and a peripheral edge therebetween, the peripheral edge being defined at least in part by:
- a first, outer chamfer adjacent the side and oriented at a first acute angle to the side;
- a second, inner chamfer adjacent the first, outer chamfer and oriented at an acute angle to the face;
- and
- an arcuate surface interposed between the first, outer chamfer and the second, inner chamfer.
A rotary drill bit for drilling subterranean formation, comprising:
- a bit body having a shank secured thereto for affixing the bit to a drill string;
- a plurality of cutting elements secured to the bit body, at least one of the cutting elements comprising:
- a substantially planar table of superabrasive material having a face, a side and a peripheral edge therebetween, the peripheral edge being defined at least in part by:
- a first, outer chamfer adjacent the side and oriented at a first acute angle to the side;
- a second, inner chamfer adjacent the first, outer chamfer and oriented at an acute angle to the face;
- and
- an arcuate surface interposed between the first, outer chamfer and the second, inner chamfer.
A cutting element for use on a rotary drill bit for drilling subterranean formations, comprising:
- a substantially planar table of superabrasive material having a peripheral edge defined by at least first and second adjacent chamfered surfaces having an arcuate surface interposed therebetween, wherein the first and second adjacent chamfered surfaces define an included angle therebetween greater than about 90°.
A rotary drill bit for drilling subterranean formation, comprising:
- a bit body having a shank secured thereto for affixing the bit to a drill string;
- a plurality of cutting elements secured to the bit body, at least one of the cutting elements comprising:
- a substantially planar table of superabrasive material having a peripheral edge defined by at least first and second adjacent chamfered surfaces having an arcuate surface interposed therebetween, wherein the first and second adjacent chamfered surfaces define an included angle therebetween greater than about 90°.
Dependencies are inferred from the claim text.