Radial bearing of screw rod drill

Abstract

The invention discloses a bearing for a screw rod drill. The bearing comprises an inner sleeve and an outer sleeve, wherein an anti-abrasion layer is adhered to each of the outer surface of the inner sleeve and the inner surface of the outer sleeve; each anti-abrasion layer is formed by arraying hard alloy blocks on a steel body according to a certain rule; a slit between hard alloy is formed by soldering tungsten carbide powder and adhesive alloy in a high-temperature furnace; the hard alloy blocks are prepared from WC-Co gradient hard alloy; the adhesive alloy comprises the components in percentage by weight: 7-18 percent of Ni, 7-8 percent of Zn, 23-25 percent of Mn and the balance being copper, and the total amount of impurities is not greater than 0.4 percent. The anti-abrasion layers of the bearing have the characteristics of high intensity, high abrasion property, small possibility of falling and the like.

Description

technical field [0001] The invention relates to a bearing, in particular to a radial bearing of a screw drilling tool used in oil and gas development drilling. Background technique [0002] The radial bearing in the screw drilling tool is a key component that affects the service life of the screw drill. Its working environment is underground high-temperature mud, so the bearing is required to have high dimensional accuracy, good wear resistance and impact resistance. [0003] Radial bearings in the prior art generally have the disadvantages of low hardness of the cemented carbide module, easy falling off of the cemented carbide module and poor wear resistance. [0004] Chinese patent CN20291028U relates to a bearing for screw drilling tools, which uses a coating to replace the cemented carbide module in the prior art. Although it simplifies the preparation process of the wear-resistant layer, the coating still has poor wear resistance. Disadvantages such as easy to fall off...

AI Technical Summary

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 cemented carbide module and poor wear resistance.

[0004] Chinese patent CN20291028U relates to a bearing for screw drilling tools, which uses a coating to replace the cemented carbide module in the prior art. Although it simplifies the preparation process of the wear-resistant layer, the coating still has poor wear resistance. Disadvantages such as easy to fall off

[0005] Chinese patent CN201915833U relates to a bearing for screw drilling tools, which has a wear-resistant layer on the inner surface of the outer casing and the outer surface of the inner casing of the radial bearing, but it has the disadvantages of complicated preparation process and high cost

[0006] Chinese patent CN202646358U relates to a bearing for screw drilling tools, which has a wear-resistant layer on the outer surface of the inner sleeve of the bearing, but has the disadvantages of insufficient cemented carbide strength, easy wear, and complicated manufacturing process.

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