Wear-resistant material used in drilling application

Abstract

The invention relates to a hard-face metal composition with strong wear resistance and fracture resistance, in particular to a wear-resistant material used in drilling application. The wear-resistant material contains tungsten carbide and a nickel matrix binder, wherein the content of the tungsten carbide in the hard-face metal composition exceeds 50% by weight, and at least 60% by volume of tungsten carbide particles are spherical; and the binder consists of (in weight percent) at least 80% of nickel, 4.5-11% of fusing agent, 3-7% of copper and 1-5% of Cr or Mo or mixture of the Cr and the Mo, wherein the fusing agent is selected from boron, silicon and phosphorus.

Description

technical field [0001] The invention relates to the field of drilling equipment for drilling and the field of various hard-sealed wear-resistant valves, in particular to wear-resistant materials for improving the durability of drilling equipment and special hard-sealed valves. technical background [0002] Oil and gas wells are formed by the rotary drill drilling method, which uses a drill bit attached to the end of a drill string. While in contact with the formation, the bit rotates to drill the earth creating a borehole. The bit is rotated by a rotary drive mechanism, which is located on the surface and turns the drill string to rotate the bit. The motors arranged between the drill strings alternately convert the hydraulic pressure of the drilling fluid into the power of the drill bit rotation, reducing the need for rotation of the entire drill string. [0003] During drilling operations, drilling fluid, known as drilling mud, may rise to the surface through the drill st...

AI Technical Summary

Problems solved by technology

The thermal reaction between the carbide and the bonding alloy in the thermal spraying process and the friction between the hardfacing alloy material and the borehole wall during drilling generate high heat, resulting in the internal stress of the tungsten carbide and the bonding alloy matrix in the microstructure of the hardfacing layer. Uniform distribution, which can cause premature wear, spalling, fracture and eventual failure of the hardfacing

[0009] In addition, in the process of welding the hard surface metal material on the bottom plate, due to the poor fluidity of the bonding material in the liquid state, the quality of the microstructure is reduced, and it is difficult to control the uniform thickness of the hard surface coating to maintain the designed shape, which determines The service life of the drill bit

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