Bearing for oil and gas development drilling

Abstract

The invention discloses a bearing for a screw rod drill. The bearing comprises an inner sleeve and an outer sleeve, wherein wear resistant layers are respectively bonded on the outer surface of the inner sleeve and the inner surface of the outer sleeve, and are prepared by arranging hard alloy blocks on a steel main body by certain rules; gaps among the hard alloy blocks are formed by brazing tungsten carbide powder and bonding alloy in a high-temperature furnace; the hard alloy blocks are ultra-fine grain gradient hard alloy blocks rich in cobalt on the surfaces, and comprise the following raw materials: 2-3% of Ti (C, N), 5-5.5% of Co, 0.2-0.4% of VC, 0.3-0.5% of Cr3C2, 0.1-0.3% of carbon black, and the balance of WC; the bonding alloy comprises the following components in percentage by weight: 11-12% of Ni, 12-14% of Zn, 23-24% of Mn, and the balance of copper; and the total amount of impurities is not greater than 0.45%. The wear resistant layers of the bearing have such characteristics as high hardness, good roughness, long wear resistant time and firm combination with a steel matrix.

Description

technical field [0001] The invention relates to a radial bearing, in particular to a radial bearing of a screw drilling tool used in oil and gas development drilling. Background technique [0002] The performance of the radial bearing in the screw drilling tool directly affects the service life of the screw drill. Its working environment is harsh, and it is surrounded by high-temperature mud when working. Therefore, the bearing is required to have good stability, wear resistance and impact resistance. [0003] Radial bearings in the prior art generally have disadvantages such as low hardness of the cemented carbide module, easy falling off of the hard module and poor wear resistance. [0004] Chinese patent CN201443561U relates to a bearing for screw drilling tools, which uses a coating to replace the cemented carbide module in the prior art. The coating is a supersonic thermal spray coating, but the coating is difficult to process and high in cost. low rate. [0005] Chin...

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Problems solved by technology

[0003] The radial bearings in the prior art generally have the disadvantages of low hardness of the cemented carbide module, easy falling off of the hard module and poor wear resistance.

[0004] Chinese patent CN201443561U relates to a bearing for screw drilling tools, which uses a coating to replace the cemented carbide module in the prior art. The coating is a supersonic thermal spray coating, but the coating is difficult to process and high in cost. low rate

[0005] Chinese patent CN203532514U relates to a bearing for screw drilling tools, which is provided with a hard alloy layer and a supersonic thermal spraying layer on the inner sleeve of the bearing. Since the wear-resistant layer is multi-layer composite, the processing cost is high and the processing is difficult.

[0006] Chinese patent CN201963717A relates to a special radial bearing for screw drilling tools. The wear-resistant layer contains cemented carbide blocks, but it has the disadvantages of low hardness of cemented carbide, high wear rate, and poor stability.

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