A cutting assembly for use in a drill bit has an ovoid insert including an ultrahard material. The ovoid insert is cast in a matrix such that the matrix surrounds at least part of the ovoid insert, limiting movement of the ovoid insert. Material is removed from the top surface and sidewall of the cutting assembly to produce a cutting edge.

A polycrystalline diamond compact including a cemented carbide substrate and a polycrystalline diamond layer bonded to the cemented carbide substrate. The cemented carbide substrate is cylindrical and includes a circumferential wall. The polycrystalline diamond layer includes a central part including between 8 and 15 wt. % of cobalt and an outer part including between 0.5 and 2 wt. % of cobalt. The outer part is a columnar ring belt and includes a chamfer. The outer part includes an upper surface, a side surface connected to the circumferential wall of the cemented carbide substrate, and a chamfer surface connecting the upper surface and the side surface. The chamfer includes a first terminal connected to the upper surface of the outer part and a second terminal connected to the side surface of the outer part.

A cutting element for a drill bit includes a PCD cutting face having a ridge that extends away from the periphery towards the center of the cutting face, terminating in a curved, central most ridge end. The cutting face further includes a surrounding surface consisting of the entire cutting face except for the ridge. The surrounding surface is free of flats and includes two side regions and a ramp region therebetween. The surrounding surface is continuously curved along a curved path that extends from the first side region to the ramp region to the other side region. In profile views, the surrounding surface may be linear moving from the top surface of the ridge to the periphery at every location along the curved path.

The disclosure relates to a polycrystalline diamond compact including a cemented carbide substrate and a diamond layer, with the diamond layer disposed at the top face of cemented carbide substrate, there are at least two continuous varying cambered convex ridges at the end face of the diamond layer, each cambered convex ridge extending from the edge of the end face to the center of end face, with the width of each continuous varying cambered convex ridge increasing gradually from the edge of the end face to the center of the end face. Both ploughing effect and the fracture drilling property of the PDC cutting face with each continuous varying cambered convex ridge are improved, the cutting resistance during drilling is reduced and thus the rate of penetration of the PDC bit is increased. A drilling bit with the polycrystalline diamond compact disposed at the end thereof is provided in the disclosure.

A cutting element for a drill bit includes a body having a face at an end thereof. The face includes a ramp, a first side region, a second side region, and a ridge thereon. The ramp has a curved edge along a periphery of the face, a first side, and a second side. The first side and the second side extend from opposite ends of the curved edge and converge at a location along the face. The ridge extends along the face from a chamfer along a peripheral edge of the face to the location. The ridge is positioned between the first side region and the second side region. The first side region extends between the periphery, the ridge, and the first side. The second side region extends between the periphery, the ridge, and the second side. The ramp extends from the first side region to the second side region.

Embodiments of the present invention provides cutting elements for use on rotary drill bits for drilling subterranean formations. More specifically, the present disclosure relates to cutting elements having a shaped upper surface including at least one spoke for cutting and/or failing subterranean formations during drilling. The present disclosure also relates to drill bits incorporating one or more of such cutting elements.

Embodiments of the present invention provides cutting elements for use on rotary drill bits for drilling subterranean formations. More specifically, the present disclosure relates to cutting elements having a shaped upper surface including at least one spoke for cutting and/or failing subterranean formations during drilling. The present disclosure also relates to drill bits incorporating one or more of such cutting elements.

A polycrystalline diamond compact (PDC), which is attached or bonded to a substrate to form a cutter for a drill bit, is comprised of sintered polycrystalline diamond interspersed with a seed material which has a hexagonal close packed (HCP) crystalline structure. A region of the sintered polycrystalline diamond structure, near one or more of its working surfaces, which has been seeded with an HCP seed material prior to sintering, is leached to remove catalyst. Selectively seeding portions or regions of a sintered polycrystalline diamond structure permits differing leach rates to form leached regions with differing distances or depths and geometries.

Polycrystalline diamond bodies having an annular region of diamond grains and a core region of diamond grains and methods of making the same are disclosed. In one embodiment, a polycrystalline diamond body (120) includes an annular region (142) of inter-bonded diamond grains having a first characteristic property and a core region (140) of inter-bonded diamond grains bonded to the annular region and having a second characteristic property that differs from the first characteristic property. The annular region decreases in thickness from a perimeter surface of the polycrystalline diamond body towards a centerline axis.

Polycrystalline diamond bodies having an annular region of diamond grains and a core region of diamond grains and methods of making the same are disclosed. In one embodiment, a polycrystalline diamond body includes an annular region of inter-bonded diamond grains having a first characteristic property and a core region of inter-bonded diamond grains bonded to the annular region and having a second characteristic property that differs from the first characteristic property. The annular region decreases in thickness from a perimeter surface of the polycrystalline diamond body towards a centerline axis.