Uniform-load thrust sliding bearing group for downhole power drilling tools

Abstract

The invention relates to a uniform-load thrust sliding bearing group for downhole power drilling tools, belonging to the technical field of downhole equipment for oil drilling. The uniform-load thrust sliding bearing group is mainly composed of a static ring, a moving ring, an outer sleeve, an overload protection moving ring and an overload protection static ring; wherein the static ring is composed of a connection stud, a thrust pad, a disk spring and a static ring base; 10-16 counter bores are uniformly distributed in the circumferential directions of the positive and negative surfaces of the static ring base; through holes are arranged at the centers of the counter bores; the connection stud passes through the through holes to be in threaded connection with the thrust pad so as to fix the disk spring between the thrust pad and the static ring base; the disk spring is arranged in a shutting form; 3-8 threaded holes are distributed on the static ring base in the radial direction; the static ring base and the outer sleeve are fixed together by a bolt; and the moving ring and the static ring are connected in series to form the bearing group. According to the uniform-load thrust sliding bearing group, drilling fluid dynamic pressure lubrication can be formed, so that the abrasion of friction surfaces is decreased; the friction surface is made of high-temperature ceramic abrasion resistant materials and has the characteristics of abrasion resistance and corrosion resistance; and the bearing group has a compact structure, so that the mounting, the overhauling and the change of the bearing group are simplified.

Description

technical field [0001] The invention relates to an equal-load thrust sliding bearing group of a downhole power drilling tool, which belongs to the technical field of downhole equipment for oil drilling. Background technique [0002] The rotary drilling method of downhole motors has been widely used. Downhole motors have the advantages of high mechanical penetration rate, precise orientation and small wear of drilling strings in drilling ultra-deep wells, directional wells, cluster wells, and hard formations. , and can be used in conjunction with the measurement-while-drilling system and the PDC bit, which is an important basis for the automation of downhole drilling tool assemblies. [0003] The downhole power drilling tool bearing group is the decisive factor of the life of the downhole power drilling tool. The bearing group bears two-way heavy load in the drilling fluid with abrasive properties, the movement speed is high, the working environment is harsh, and the life of...

AI Technical Summary

Problems solved by technology

The number of components in the ball bearing group is large, and the installation and adjustment accuracy is high. The bearing group is often loaded unevenly due to unreasonable bearing clearance, and excessive wear and impact crushing are prone to occur under high-speed and heavy loads. Group lifetime is unstable

When working in high temperature, the diamond thrust plate is prone to overheating and wear, and it is difficult to adapt to the high temperature working environment of ultra-deep wells

The load-sharing design and lubrication performance of the above-mentioned types of bearing groups are lacking, and the load-sharing performance of the bearing group has decisive significance for the life of the downhole power drilling tool bearing group

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