Polycrystalline diamond cutter with high wear resistance and strength
AssigneeSchlumberger Technology Corporation
InventorGeorgiy Voronin
Life of this patent
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Abstract
A cutting element has a thermally stable polycrystalline diamond layer formed on an upper side of a polycrystalline diamond layer. The cutting element has a cutting face opposite the polycrystalline diamond layer, a transition layer on a side of the polycrystalline diamond layer opposite the thermally stable polycrystalline diamond layer, and a non-planar interface between the transition layer and the polycrystalline diamond layer. The non-planar interface has a perimeter exposed around a side surface of the cutting element encircling an interior of the non-planar interface and an uppermost portion of the perimeter is a distance from the cutting face greater than an axial distance between the cutting face and the interior.
Claims20
A cutting element, comprising:
- a polycrystalline diamond layer;
- a thermally stable polycrystalline diamond layer at a side of the polycrystalline diamond layer and having a planar cutting face opposite the polycrystalline diamond layer;
- a transition layer at a side of the polycrystalline diamond layer opposite the thermally stable polycrystalline diamond layer;
- and
- a non-planar interface between the transition layer and the polycrystalline diamond layer, the non-planar interface comprising a perimeter exposed around a side surface of the cutting element and encircling an interior of the non-planar interface and an uppermost portion of the perimeter being an axial distance from the planar cutting face greater than an axial distance between the planar cutting face and the interior.
A cutting element, comprising:
- a diamond body, the diamond body comprising:
- a leached portion at a planar cutting face of the cutting element;
- and
- an unleached portion;
- a transition layer adjacent to the unleached portion of the diamond body;
- and
- a non-planar interface between the diamond body and the transition layer, the non-planar interface comprising a perimeter around a side surface of the cutting element, the perimeter being an axially lowermost portion of the non-planar interface from the planar cutting face,
- wherein the diamond body has a thickness between the planar cutting face and the non-planar interface that is greater proximate the side surface of the cutting element than proximate a central axis of the cutting element.
A cutting element, comprising a cylindrical body having a planar cutting face and a side surface, the cylindrical body comprising:
- a substrate;
- a transition layer on the substrate;
- a polycrystalline diamond layer at a first non-planar interface with the transition layer opposite the substrate;
- and
- a thermally stable polycrystalline diamond layer adjacent the polycrystalline diamond layer opposite the transition layer, the thermally stable polycrystalline diamond layer forming the planar cutting face and a portion of the side surface, a cutting edge formed at an intersection of the planar cutting face and the side surface,
- the first non-planar interface comprising a geometry having a downwardly sloped portion from an interior to a perimeter, the perimeter extending entirely around the side surface of the cutting element and having a greater axial distance from the planar cutting face than an axial distance to the planar cutting face at the interior.
Dependencies are inferred from the claim text.