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System, method, and apparatus for enhancing the durability of earth-boring

A drill bit and drill bit body technology, applied in the field of drill bits, can solve the problems of expensive tungsten carbide and loss of expensive diamonds.

Inactive Publication Date: 2009-03-04
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the cutter element is sheared off the bit body, the expensive diamonds on the cutter element are lost and the drill may stop drilling
Also, tungsten carbide is very expensive compared to steel as a material of manufacture

Method used

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  • System, method, and apparatus for enhancing the durability of earth-boring
  • System, method, and apparatus for enhancing the durability of earth-boring
  • System, method, and apparatus for enhancing the durability of earth-boring

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Embodiment Construction

[0026] see figure 1 , one embodiment of a carbide crystal 21 constructed in accordance with the present invention is shown in simplified circular form. In the illustrated embodiment, crystals 21 are formed of tungsten carbide (WC) and have an average grain size ranging from about 0.5 to 8 microns, depending on the application. The term "average particle size" refers to the average diameter of particles that are slightly irregular in shape.

[0027] see now figure 2 , one example of crystal 21 is shown forming a sintered oblate spheroid pellet 41 . Neither crystals 21 nor pellets 41 are drawn to scale, they are shown in simplified form for reference purposes only. The invention should not be interpreted or limited by these descriptions. For example, other possible shapes include elongated or oval circular structures and the like.

[0028] The pellets 41 are suitable for use, for example, in case hardening for drill bits. Pellets 41 are formed from a plurality of crystals...

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Abstract

An earth-boring drill bit having a bit body with a cutting component formed from a tungsten carbide composite material is disclosed. The composite material includes a binder and tungsten carbide crystals comprising sintered pellets. The composite material may be used as a hardfacing on the body and / or cutting elements, or be used to form portions or all of the body and cutting elements. The pellets may be formed with a single mode or multi-modal size distribution of the crystals.

Description

technical field [0001] The present application relates generally to drill bits, and more particularly to an improved system, method and apparatus for enhancing drill bit durability using carbide materials. Background technique [0002] Typically, drill bits include a one-piece bit body, which may be formed from steel or from a hard matrix material such as tungsten carbide. In one type of drill bit, a plurality of diamond cutter arrangements are mounted along the outer surface of the bit body. Each diamond tool typically has a stud portion that fits within a groove on the outer surface of the drill bit. Depending on the design of the bit body and the type of diamond used, the tool is positioned in the mold before forming the bit body, or the tool is fastened to the bit body after it has been formed. [0003] The cutting elements are positioned along the leading edge of the bit body so that when the bit body is rotated in its intended direction of use, the cutting elements e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08
Inventor D·A·柯里J·L·奥弗斯特里特J·W·伊森
Owner BAKER HUGHES INC
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