Screw drilling tool oil seal spindle assembly

Abstract

The invention relates to an oil seal spindle assembly of a screw drill. According to the technical scheme, the oil seal spindle assembly of the screw drill comprises a shell portion and a spindle, wherein a lower outer bearing shell, a lower shell and an upper shell are connected together from bottom to top to form the shell portion, the spindle penetrates through the center of the shell portion, a first sealing ring and a sliding seal is arranged between the lower end of the lower outer bearing shell and the spindle, the locating function and pre-tightening force are provided by gland nuts and pressure gaskets, a sealing structure of part of the lower outer bearing shell is formed, and sealing between the lower end of the lower outer bearing shell and the spindle is ensured; an integral sliding piston in the upper shell can vertically slide along the spindle, the balance between the pressure in a sealing cavity and the external pressure is ensured, and oil sealing is achieved. The oil seal spindle assembly of the screw drill has the advantages that lubrication and cooling are accomplished through lubricating oil, flow division of slurry is not needed, the slurry completely flows through an inner hole of the spindle, and thus it is ensured that enough slurry passes through a bit port. The lubricating effect is improved through the lubricating oil environment, the frictional loss is reduced, the working efficiency can be integrally improved, and the service life can be integrally prolonged.

Description

technical field [0001] The invention relates to a screw drilling tool of an oil drilling tool, in particular to an oil-sealed main shaft assembly of the screw drilling tool. Background technique [0002] With the continuous maturity of the screw drilling industry, the screw drilling tool is mainly divided into five parts from top to bottom, the bypass valve part, the anti-drop assembly part, the motor part, the cardan shaft assembly, and the main shaft assembly part. The mud flows through the motor to do work to drive the rotor to rotate, and after being transmitted by the cardan shaft, it drives the main shaft to rotate. When the shell part does not rotate, the main shaft can drive the drill bit to drill wells. [0003] At present, all parts of screw drilling tools have been improved. The motor part is improved from ordinary motors to equal-wall thickness motors and high-temperature motors. The cardan shaft part is improved to a ball joint type cardan shaft and an adjustab...

AI Technical Summary

Problems solved by technology

The motor part is improved from ordinary motors to equal-wall thickness motors and high-temperature motors. The cardan shaft part is improved to a ball joint type cardan shaft and an adjustable curved housing. The next thing that needs to be improved is the main shaft assembly. The existing main shaft assembly Structure reference attached figure 1 , including upper nut a1, upper inner TC bearing a2, upper outer TC bearing a3, bearing housing a4, thrust ring a5, string bearing a6, lower nut a7, adjustment ring a8, lower inner TC bearing a9, lower outer TC bearing a10, main shaft a11, wherein, the mud passes through the middle of the inner and outer TC bearings and the middle of the series bearings, and lubricates and cools the bearings by diverting 4% of the mud; the mud flows through the upper TC bearings, thrust bearings and lower TC bearings, due to the solid phase components in the mud Existence, increased abrasive wear and power loss, has a direct impact on the life of the bearing assembly, there are still problems with the water eye pressure drop of the drilling tool, the poor bearing capacity of the drilling pressure, and the low service life of the overall screw drilling tool

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