Coated diamonds for use in impregnated diamond bits

a technology of diamonds and diamonds, applied in the field of drill bits, can solve the problems of diamonds being lost from the bit, the life of both natural and synthetic diamonds is shortened,

Inactive Publication Date: 2005-10-20
SMITH INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It has been found, however, that the life of both natural and synthetic diamond is shortened by the lifetime thermal exposure experienced in the furnace during the infiltration process.
For example, diamonds imbedded according to methods disclosed in the '202 patent have a total thermal exposure of less than 40 minutes, and more typically less than 20 minutes (and more generally about 5 minutes), above 1500° F. This limited thermal exposure is due to the shortened hot pressing period and the use of the brazing process.
The diamonds are also subjected to a number of different forces that may cause the diamonds to be lost from the bit.

Method used

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  • Coated diamonds for use in impregnated diamond bits
  • Coated diamonds for use in impregnated diamond bits
  • Coated diamonds for use in impregnated diamond bits

Examples

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Embodiment Construction

[0025] In one aspect, the present invention relates to diamonds that have a specialized coating for use in diamond impregnated bits. In selected embodiments, the coating is a boride, nitride, or carbide of a group IVA, VA, or VI transition metal (Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, or mixtures thereof). In particular embodiments, the coating is a silicon carbide. Other silicon coatings may be used as well. Further, those having ordinary skill in the art will recognize that other coatings may be used. The present inventors have discovered that by providing a strongly bonded wettable coating for the diamonds, enhanced diamond bonding and / or retention strength results, improving the performance of the impreg bit.

[0026] In one embodiment of the invention, coated diamonds 100 are manufactured prior to the formation of the impregnated bit, as shown for example in FIG. 3. In this embodiment, uncoated diamond particles 90 are placed on a work surface 92. The diamond particles can be natural,...

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Abstract

An insert for an impreg bit that includes coated diamond particles disposed in a matrix material, wherein the coated diamond particles include a boride, a nitride, and a carbide of a group IVA, VA, VI transition metal or silicon disposed on synthetic, natural, TSP diamonds, or combinations thereof is disclosed. A method of forming a diamond-impregnated insert, including coating a plurality of diamond particles with a coating formed from a boride, a nitride, and a carbide of a group IVA, VA, VI transition metal or silicon or mixtures thereof, and forming a diamond impregnated insert body is also disclosed.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application claims priority under 35 U.S.C. §119 to U.S. Provisional Application Ser. No. 60 / 498,543, filed Aug. 28, 2003. This provisional application is hereby incorporated by reference in its entirety.BACKGROUND OF INVENTION [0002] 1. Field of the Invention [0003] The present invention relates generally to drill bits used in the oil and gas industry and more particularly, to drill bits having diamond-impregnated cutting surfaces. Still more particularly, the present invention relates to drag bits in which the diamond particles imbedded in the cutting surface have a coating to improve diamond bonding and / or reduce diamond degradation. [0004] 2. Background Art [0005] In the drilling industry, it is well known that different types of bits work more efficiently with different formations. Rotary drill bits with no moving elements on them, referred to as “drag” bits, may be used to drill very hard or soft formations depending on the t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B24D18/00C22C1/10C22C26/00E21B10/56
CPCB22F2005/001B24D18/0054C22C1/1068E21B10/56C22C2001/1073C22C2026/005C22C26/00C22C1/1073
Inventor OLDHAM, THOMAS W.BEATON, TIMOTHY P.
Owner SMITH INT INC
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