Polycrystalline diamond drill bit matrix powder

Abstract

The invention relates to a powder metallurgy material for manufacturing a polycrystalline diamond drill bit matrix. The powder metallurgy material comprises the components by weight percent: 30-60% of spherical sintered WC particles with the particle size of 125-500 microns, 25-60% of fine macrocrystalline WC particles with the particle size of 50-200 microns, and 5-15% of nickel powder. According to the invention, bonding phase can penetrate into the hollow spherical sintered WC particles and can be used for filling the hollow spherical sintered WC particles, so that the bonding phase and hard phase in the matrix can be better combined with each other, and the matrix has higher strength and toughness; and gaps among coarse particles can be effectively filled by the fine macrocrystalline WC particles, so that the erosion resistance and the wear resistance of the matrix can be better improved. According to the invention, the matrix material cost of a drill bit is reduced; and as the performances of the matrix are improved, the polycrystalline diamond compact (PDC) drill bit with a thinner or longer scraping knife can be designed, and the drilling rate of the PDC drill bit can be greatly increased.

Description

technical field [0001] The invention relates to a powder metallurgy material for making a polycrystalline diamond (PDC) bit matrix, in particular to a polycrystalline diamond bit matrix powder, which belongs to the technical field of petroleum drill bit materials. Background technique [0002] In oil drilling, matrix PDC drill bits are increasingly used because of their good erosion resistance. With the development of drilling technology and the increasingly complex drilling conditions, on the premise of ensuring the safety of the bit scraper, higher requirements are put forward for the drilling speed of the PDC bit. The matrix PDC bit mainly includes two parts: the bit body and the upper body connection. The lower part of the bit body is the matrix, and the polycrystalline diamond composite (knife) sheet is welded on the matrix. For the PDC bit, in addition to using polycrystalline diamond composites with better toughness and wear resistance, changing the structure of the ...

AI Technical Summary

Problems solved by technology

Compared with the traditional matrix powder, this kind of matrix powder has greatly improved strength and toughness. However, a large amount of cast WC fine powder will affect the permeability of the drill bit, and the sintering process is prone to defects such as matrix looseness.

In addition, the bit manufacturing cost of this kind of matrix powder is relatively high, and it is difficult to meet the demand of low cost

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