Non planar cutting element with non planar interface design and tools incorporating such elements
AssigneeSchlumberger Technology Corporation
InventorsRonald K. Eyre, Feng Yu, Cheng Peng
Life of this patent
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Abstract
A cutting element may include a substrate having a non-planar upper surface with a peripheral edge, and an ultrahard layer. The upper surface may include at least one depression formed at least proximate the peripheral edge; and a compressive stress hoop extending around the upper surface adjacent the peripheral edge, extending into the at least one depression, and configured to reduce tensile stress in the ultrahard layer. The ultrahard layer may be on the substrate and may have a non-planar top surface and an interface formed between the ultrahard layer and the substrate.
Claims22
A cutting element comprising:
- a substrate having a peripheral edge and a non-planar upper surface, the substrate further having a crest including a longitudinal axis, wherein the non-planar upper surface comprises:
- at least one depression formed at least proximate the peripheral edge and in line with the longitudinal axis of the crest, and
- a compressive stress hoop extending around the upper surface adjacent the peripheral edge, extending into the at least one depression, and configured to reduce tensile stress in an ultrahard layer;
- and
- the ultrahard layer on the substrate and having a non-planar top surface,
- wherein an interface is formed between the ultrahard layer and the substrate,
- wherein the ultrahard layer further comprises an extension below the non-planar top surface, and
- wherein the extension that extends into the at least one depression of the substrate.
A cutting element comprising:
- a substrate having a peripheral edge and a non-planar upper surface, the substrate further having a crest with a longitudinal axis, wherein the non-planar upper surface comprises at least one depression that extends to the peripheral edge and is in line with the longitudinal axis of the crest;
- and
- an ultrahard layer on the substrate, the ultrahard layer comprising:
- a non-planar top surface having a cutting edge, the cutting edge being over the at least one depression;
- a bottom surface, such that the bottom surface of the ultrahard layer and the upper surface of the substrate form an interface;
- and
- an extension below the non-planar top surface, wherein the extension extends into the at least one depression of the substrate,
- wherein the at least one depression has a depth and the ultrahard layer has a thickness at the cutting edge such that the peripheral edge of the non-planar upper surface of the substrate is at a minimum height at the at least one depression.
Dependencies are inferred from the claim text.