A power output shaft with four anti-loosening and two anti-falling preventions for a screw drilling tool

Abstract

The invention discloses a four-loosening-preventing and two-falling-preventing type power output shaft of a screw drill. The power output shaft comprises a main shaft 1, a bearing section housing 4 positioned at the outer side of the main shaft, and a centering device 8 positioned at the outer side of the bearing section housing; upper radial bearings 3, rolling bearing sets 7 and lower radial bearings 12 are arranged in the main shaft and the bearing section housing; the main shaft 1 is connected with a bearing housing 4 at the outer side of the main shaft through a housing locking nut 13; an upper locking nut 2 is arranged between the main shaft 1 and each upper radial bearing 3; the bearing section housing 4 is connected with the centering device 8 through a centering device nut 10; falling preventing locking nuts 11 and adjusting separating sleeves 9 are arranged between the rolling bearing sets 7, the main shaft 1 and the lower radial bearings 12.

Description

technical field [0001] The invention relates to a downhole power drilling tool for drilling and repairing wells, in particular to a power output shaft of a screw drilling tool with four anti-loosening and two anti-dropping functions. [0002] technical background [0003] With the increasing demand for energy and resources, domestic drilling technology and technology have been developed at a high speed, which has greatly promoted the development of downhole dynamic drilling tools, especially screw drilling tools. Screw drilling tools were initially widely used in vertical wells. With the development of resource development and drilling technology, a series of complex wells such as directional wells, extended reach wells and horizontal wells appeared, and the advantages of screw drilling tools became more and more obvious. Of course, there are also Many problems need to be solved urgently. For example: 1. The pressure of the pressure gauge suddenly rises, which will cause the...

AI Technical Summary

Problems solved by technology

For example: 1. The pressure of the pressure gauge suddenly rises, which will cause the motor to stall, which may cause the threaded connection of the output shaft of the screw drilling tool to loosen; 2. The output shaft is stuck and does not turn suddenly, the water hole of the drill bit is blocked, and poor drilling occurs. phenomenon, it will also cause the threaded connection of the output shaft part of the screw drilling tool to loosen; 3. The output bearing is subjected to a large axial load generated by the drilling pressure, and the threaded connection is prone to loosening; 4. The rolling bearing bears a large force, Axial movement is prone to occur, seriously affecting the performance and life of screw drilling tools

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