Dual-Edge Working Surfaces for Polycrystalline Diamond Cutting Elements

a cutting element and working surface technology, applied in the field of superhard polycrystalline material elements, can solve the problems of imposing a limit on the maximum useful operating temperature of the element, assembly is subjected to very high temperature and pressure, and the element may be subject to thermal degradation

Inactive Publication Date: 2006-04-27
REEDHYCALOG UK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0019] The invention also relates to a method of manufacturing a cutting element comprising forming a table of superhard material bonded to a less hard substrate, the table of superhard material defining a plurality of interstices containing a catalyzing material, the table defining an end working surface and a peripheral working surfa

Problems solved by technology

A common trait of PCD elements is the use of catalyzing materials during their formation, the residue from which, often imposes a limit upon the maximum useful operating temperature of the element while in service.
The assembly is then subjected to very high temperature and pressure in a press.
Such an element may be subject to thermal degradation due to differential thermal expansion between the interstitial cobalt binder-catalyzing material and diamond matrix beginning at temperatures of about 400

Method used

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  • Dual-Edge Working Surfaces for Polycrystalline Diamond Cutting Elements
  • Dual-Edge Working Surfaces for Polycrystalline Diamond Cutting Elements
  • Dual-Edge Working Surfaces for Polycrystalline Diamond Cutting Elements

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Embodiment Construction

[0039] Referring now to FIGS. 1-4, the polycrystalline diamond and polycrystalline diamond-like (PCD) element 1010 of the present invention may be a preform cutting element 1010 for a fixed cutter rotary drill bit 1012 (as shown in FIG. 1). The bit body 1014 of the drill bit is formed with a plurality of blades 1016 extending generally outwardly away from the central longitudinal axis of rotation 1018 of the drill bit. Spaced apart side-by-side along the leading face 1020 of each blade is a plurality of the PCD cutting elements 1010 of the present invention.

[0040] Typically, the PCD cutting element 1010 has a body in the form of a circular tablet having a thin front facing table 1022 of diamond or diamond-like (PCD) superhard material, bonded in a high-pressure high-temperature press to a substrate 1024 of less hard material such as cemented tungsten carbide or other metallic material. The cutting element 1010 is preformed and then typically bonded on a generally cylindrical carrie...

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Abstract

A PCD cutting element, which in operation (and as it wears to a worn condition) presents at least two cutting lips to the material being cut. One particularly advantageous use of this new PDC cutting element is as cutting elements for earth boring drill bits.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The invention relates to superhard polycrystalline material elements for earth drilling, cutting, and other applications where engineered superhard surfaces are needed. The invention particularly relates to polycrystalline diamond and polycrystalline diamond-like (collectively called PCD) elements with dual edged working surfaces. [0003] 2. Description of the Related Art [0004] Polycrystalline diamond and polycrystalline diamond-like elements are known, for the purposes of this specification, as PCD elements. PCD elements are formed from carbon based materials with exceptionally short inter-atomic distances between neighboring atoms. One type of diamond-like material similar to PCD is known as carbonitride (CN) described in U.S. Pat. No. 5,776,615. In general, PCD elements are formed from a mix of materials processed under high-temperature and high-pressure into a polycrystalline matrix of inter-bonded superhard car...

Claims

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Application Information

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IPC IPC(8): E21B10/36E21B10/567
CPCE21B10/567E21B10/46E21B10/52E21B10/56
Inventor GRIFFIN, NIGEL DENNISHUGHES, PETER RAYMONDBELL, ANDREW
Owner REEDHYCALOG UK
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