Slide bearing joint in well with adjustable wellhead

Abstract

The invention relates to a slide bearing joint in a well with an adjustable wellhead, belonging to the field of oil and gas drilling equipment. The slide bearing joint in a well with an adjustable wellhead mainly comprises an upper rotating shaft, a shell, an upper sealing ring, a slide sleeve, a lower sealing ring, a thrust sleeve, a spring, a lower rotating shaft, a self-lubricating layer, an upper spring dowel, a lower spring dowel, a slide bearing inner ring, a slide bearing outer ring, a location baffle and a locking bolt. A fluid guide hole is arranged on the lower part of the upper rotating shaft, and the fluid guide hole guides a drilling fluid which flows through the upper rotating shaft in a gap between the upper rotating shaft and the sleeve; the slide sleeve is a step-shaped sleeve, an upper sealing groove and a lower sealing groove are arranged in the inner hole of the slide sleeve, and a gap is formed between the inner diameter of the slide sleeve and the outer diameter of the upper rotating shaft; and the upper spring dowel is used for locating the slide bearing outer ring before adjusting the bearing, and the lower spring dowel is used for locating the slide bearing outer ring after adjusting the bearing. The slide bearing joint in a well with an adjustable wellhead disclosed by the invention reduces the time used for adjusting the bearing joint or replacing the bearing joint, increases the continuous working time of the bearing in the well, and increases the working efficiency.

Description

Technical field [0001] The invention relates to a wellhead adjustable downhole sliding bearing joint, which belongs to the field of petroleum and natural gas drilling equipment. Background technique [0002] During the drilling process, the rotating shaft in the downhole tool often uses a radial bearing section as a support to reduce the frictional resistance during power transmission and keep the center position of the rotating shaft fixed. In practical applications, the premature failure of the bearing joint is the main reason for the reduction of downhole tool life. At present, after the bearing joint fails, it is necessary to trip to replace the bearing joint or adjust the bearing joint, and then drill down again, which is time-consuming and labor-intensive. Therefore, it is necessary to improve the structure to reduce the time used to replace or adjust the bearing section. Summary of the invention [0003] The purpose of the present invention is to overcome the shortcomings...

AI Technical Summary

Problems solved by technology

However, in practical applications, the premature failure of bearing joints is the main reason for the reduction of downhole tool life.

At present, after the bearing joint fails, it is necessary to trip out the drill to replace the bearing joint or adjust the bearing joint, and then run down the drill again, which is time-consuming and labor-intensive

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