Radial sliding bearing for turbine drill

Abstract

The invention discloses a radial sliding bearing for a turbine drill. The bearing comprises a steel static ring and a steel moving ring, wherein the static ring is sleeved at the outer part of the moving ring; a first sliding contact layer which is formed by the arrangement of a plurality of hard alloy blocks in intervals is inlaid on the inner surface of the static ring; a second sliding contact layer which is formed by the arrangement of a plurality of hard alloy blocks in intervals is inlaid on the inner surface of the moving ring; and the first sliding contact layer and the second sliding contact layer are arranged in opposite and form sliding match. The sliding bearing provided by the invention has stronger abrasive resistance, the service life is prolonged greatly, the over-high temperature can be avoided in the using of the bearing, and the bearing can be suitable for the use under a severe working condition, such as a deep well and high-temperature high-pressure drill.

Description

technical field [0001] The invention relates to a downhole dynamic drilling tool used in the fields of petroleum, mines, coal fields, gas fields, etc., especially a radial sliding bearing of a turbo drilling tool with simple structure and long service life, and the surface of the friction pair is embedded with cemented carbide blocks. It belongs to the technical field of mechanical manufacturing. Background technique [0002] As we all know, the turbodrill is the earliest downhole hydraulic motor in industrial application. Its function is to convert the hydraulic pressure energy of the working fluid into mechanical energy, and drive the drill bit to rotate to break the bottom rock. Historically, turbodrilling tools have been used as the main drilling tool in the oil industry in the former Soviet Union, and the turbodrilling footage accounts for more than 80% of the total drilling footage. At present, the turbodrilling tool is still a commonly used downhole power drilling to...

AI Technical Summary

Problems solved by technology

[0005] 1. Due to the hard-soft matching method, the mechanical friction loss is large and the efficiency is low;

[0006] 2. The existing radial sliding bearings have a low working life in sand-containing drilling fluids and need to be replaced frequently, resulting in high equipment maintenance costs

[0007] 3. With the increase of the well depth, the formation temperature gradually rises. When the formation temperature exceeds 120 ° C ~ 150 ° C, the friction heat of the metal-rubber paired radial sliding bearing of the turbodrill cannot be taken away in time, and the rubber bushing It will quickly harden and become brittle and fail, and the reliability is poor, which makes the existing hard-soft paired radial sliding bearing turbodrills unsuitable for deep wells, ultra-deep wells or high-temperature and high-pressure wells

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