Torque overload protection tool

Abstract

The invention discloses a torque overload protection tool. The torque overload protection tool is characterized by comprising an outer power cylinder, an overload protection device, a bearing assembly, a sealing assembly and an output shaft. The overload protection device comprises a center shaft, an upper spline, a lower transmission device, a spring and a lock nut; the upper spline, the lower transmission device, the spring and the lock nut are coaxial with the center shaft; torque is transmitted between the upper spline and a first lower spline through a transmission spline; the outer power cylinder is connected with the overload protection device, the lower portion of the overload protection device is sequentially connected with the bearing assembly and the sealing assembly, and the center shaft is connected with the output shaft. Due to sliding contact of contact faces between the upper spline and the lower transmission device, the torque value is controlled by compressing force of the spring; when rotating torque exceeds set overload torque, internal rotation is achieved, and damage caused by excessive torque to a downhole tool connected with the center shaft is avoided; when the rotating torque does not exceed set separation torque, the torque can be output continuously, and working is completed.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a torque overload protection tool. Background technique [0002] In the process of oil and gas field development, drilling and workover are the main operation steps. It is necessary to use the rotary table and top drive to rotate the drill bit to break the rock from the ground, or use the screw motor to provide the drill bit to rotate and break the rock from the downhole. Either way, the ultimate torque transfer to the drill bit (or other drill tool assembly) is through the drill pipe or drill collar. During the drilling process, different formations exert different resistances on the drill bit. This resistance makes the torque transmitted by the drill string exceed the normal drilling torque, which may cause damage or breakage of the drill string. Most drill strings can only transmit a certain torque, which is too large. The downhole tool cannot be overloaded when t...

AI Technical Summary

Problems solved by technology

During the drilling process, different formations exert different resistances on the drill bit. This resistance makes the torque transmitted by the drill string exceed the normal drilling torque, which may cause damage or breakage of the drill string. Most drill strings can only transmit a certain torque, which is too large. No overload protection for downhole tools during torque

After the downhole tool is damaged, the damaged tool can only be pulled out to replace the damaged tool, which increases the number of times the drill string is lifted and wastes drilling time and costs.

[0003] At present, there are some torque overload protection tools on the market, including ball type, friction type, hydraulic type, pneumatic type, electromagnetic type, etc., but these protectors have large volume, complex structure, high manufacturing maintenance and use costs. problems, unable to meet the needs of small underground working space and harsh working environment

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