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Spirally and/or radially serrated superhard cutter

Inactive Publication Date: 2019-12-12
VAREL INT IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present disclosure is about a special cutter that can be used with a drill bit. It is made from a cermet material and has at least four serrations on its working face and side. Each serration has a pair of base edges and an apical edge. The edges of the serrations are all converging at the center of the working face and extend radially or spirally from the side of the cutter to the interface with the drill bit. The technical effect of this design is improved drill bit performance in drilling hard materials, with reduced wear and better surface quality.

Problems solved by technology

The diamond cutting element may contain a pattern of ridges or bumps integrally formed in the abrasive layer which ridges are designed to cause high localized stresses in the rock, thus starting a crack.

Method used

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  • Spirally and/or radially serrated superhard cutter
  • Spirally and/or radially serrated superhard cutter
  • Spirally and/or radially serrated superhard cutter

Examples

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Embodiment Construction

[0017]FIGS. 1A-1D illustrate manufacture of a radially serrated superhard cutter 1 (FIG. 2A), according to one embodiment of the present disclosure. Referring to FIG. 1A, the manufacturing process may commence by placement of a shear cutter 2 into a laser cutter machine 3. The shear cutter 2 may include a cylindrical cutting table 4 mounted to a cylindrical substrate 5. The cutting table 4 and substrate 5 may be circular-cylindrical (shown) or elliptic-cylindrical (not shown). The cutting table 4 may be made from a superhard material, such as polycrystalline diamond (PCD), and the substrate may be made from a hard material, such as a cermet, thereby forming a compact, such as a polycrystalline diamond compact. The cermet may be a cemented carbide, such as a group VIIIB metal-tungsten carbide. The group VIIIB metal may be cobalt. The shear cutter 2 may be manufactured by a high pressure, high temperature (HPHT) sintering operation using either a belt press or a cubic press.

[0018]Refe...

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PUM

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Abstract

A cutter for use with a drill bit includes: a substrate for mounting in a pocket of the drill bit and made from a cermet material; and a cutting table made from a polycrystalline superhard material, mounted to the substrate at an interface, having a working face opposite from the interface, and having at least four serrations formed in the working face and a side thereof. Each serration has a pair of base edges and an apical edge extending above the base edges at the side of the cutting table. Each edge extends radially or spirally from the side of the cutting table to a central portion of the working face. The edges all converge at the center of the working face.

Description

BACKGROUND OF THE DISCLOSUREField of the Disclosure[0001]The present disclosure generally relates to a spirally and / or radially serrated superhard cutter.Description of the Related Art[0002]U.S. Pat. No. 4,984,642 discloses a composite tool including a sintered metal carbide support and a polycrystalline diamond active part having an inner surface of metallurgical connection to the support and an outwardly facing working surface. The working surface comprises corrugations which are substantially parallel to one another and form successive projecting zones and hollow zone on at least a part of the working surface. The composite tool is in particularly intended for drilling to a great depth, such as drilling oil wells.[0003]U.S. Pat. No. 5,848,657 discloses a domed polycrystalline diamond cutting element wherein a hemispherical diamond layer is bonded to a tungsten carbide substrate, commonly referred to as a tungsten carbide stud. The cutting element includes a metal carbide stud hav...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B10/567E21B10/55
CPCE21B10/5673E21B10/55E21B10/5671E21B10/46
Inventor VIJAYABALAN, VIJAYAVELAN
Owner VAREL INT IND