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Bit body of diamond bit and manufacture method therefor

A technology of diamond bit and bit body, which is applied in the direction of drill bit, earthwork drilling, drilling equipment, etc., achieves the effects of uniform stress distribution, reduced manufacturing cost, and enhanced comprehensive performance

Active Publication Date: 2010-06-16
KINGDREAM PLC CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a bit body is wear-resistant and erosion-resistant, but the strength and toughness of the matrix are relatively low, usually the bending strength is about 700MPa, and the impact toughness is not higher than 5J / CM2
In actual use, due to the problem of low strength, it is easy to cause the cracking or even breaking of the blade body of the drill bit, which will bring potential hidden dangers and dangers to drilling, and seriously affect the comprehensive performance and service life of the diamond drill bit.
U.S. Patent 4884477 introduces a drill body manufacturing method in which steel, iron and other metal powders are added to the drill body skeleton material, and the surface is strengthened. However, the surface strengthening process introduced in this patent is a process of repeatedly spraying glue and tungsten carbide powder. , this method is inefficient, the coating is thin, and the surface strengthening effect is greatly limited
As for the steel-body PDC bit body, although it has high strength and toughness, the steel-body bit body that is surface-strengthened by methods such as surfacing welding is still vulnerable to erosion

Method used

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  • Bit body of diamond bit and manufacture method therefor
  • Bit body of diamond bit and manufacture method therefor
  • Bit body of diamond bit and manufacture method therefor

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Embodiment Construction

[0024] Embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0025] The embodiment is shown in Figures 1 and 2. Firstly, cast tungsten carbide powder with a particle size between 0.037 mm and 0.149 mm is mixed with an adhesive to make a tungsten carbide powder colloid with certain adhesive properties. The content of the components mixed with tungsten carbide particles and adhesive is by weight. : Tungsten carbide particles 90%, the balance of adhesive. The adhesive is a fluid adhesive prepared by weight from 1 to 10% of glycerin, 5 to 15% of alkyl acrylate, and the remainder of diethylene glycol monobutyl ether, and then the tungsten carbide powder is uniformly bonded Apply on the assembled graphite concave cavity mold 1 and upper mold 4, and apply about 3 mm thick to form a sintered tungsten carbide sintered layer 2 to be sintered; similarly, apply a layer of 3 mm thick on the surface of the graphite nozzle hole...

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Abstract

The invention relates to a method for producing drilling head and body of diamond driller, comprising a skeleton corn and an outer abrasion resistant layer. The invention is characterized in that theskeleton corn is made from a steel corn and outside casting sintered elements, the outer abrasion resistant layer is formed by carbon tungsten sinter layer, the casting sintered element and the carbontungsten sinter are formed by high-temperature fusing and sintering adhesive metal, to be integrated with the steel corn. The invention uses the casting steel drop as skeleton to improve strength andflexibility of the corn of driller, while the surface has same abrasion resistance as traditional carbon tungsten powder blank PDC driller, and its bend resistance and impact resistance are 40% higher than traditional driller. The invention can save cost and avoid crack, to improve service life or the like.

Description

technical field [0001] The invention relates to a drill bit body of a diamond drill bit used in the field of petroleum geological drilling and a manufacturing method of the drill bit body. Background technique [0002] In oil drilling, diamond drill bit (PDC bit) is widely used due to its long service life. The structure of the diamond drill bit is mainly composed of three parts: the upper body connected to the drill pipe, the drill body and the blade welded on the ball nose of the drill body. The drill body is provided with nozzle holes, and the drill body is the key component of the diamond drill. Existing diamond drill bit bodies are all made of tungsten carbide powder as the skeleton material, Cu alloy as the bonding metal, and are manufactured by a pressureless impregnation method. Such a bit body is wear-resistant and erosion-resistant, but the strength and toughness of the matrix are relatively low, usually the bending strength is about 700MPa, and the impact toughn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B10/46B22F3/10E21B10/60C22C29/08C22C38/04
Inventor 彭金龙张烈华
Owner KINGDREAM PLC CO
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