Underground drilling tool with self-locking and unstucking function

Abstract

The invention discloses an underground drilling tool with a self-locking and unstucking function, and relates to the technical field of well drilling. The drilling tool comprises a shell, a transmission shaft and a clutch, wherein the shell 1 and the clutch 3 are coaxially arranged, the clutch is arranged between the shell and the transmission shaft, the clutch comprises an inner ring and an outerring, the outer ring is fixed to the shell through a positioning pin, the inner ring is fixedly connected with the transmission shaft through a key, a mounting groove is formed in the inner wall of the outer ring, the depth of the mounting groove in the diameter direction is gradually increased in the rotating direction of the transmission shaft, a roller body is further arranged in the mountinggroove, and a spring connected with the roller body is further arranged on the groove wall of the mounting groove. When the bottom hole collapses and the drill bit gets stuck, the drill bit can be quickly unstuck, a pump can be quickly started after the drill bit is unstuck, normal drilling is recovered, and the drilling efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of drilling, in particular to a downhole drilling tool with self-locking and jam-releasing functions. Background technique [0002] In the prior art, there are three kinds of downhole power devices for petroleum drilling, namely screw drilling tools, turbo drilling tools and electric drilling tools; due to the improvement of structure, the application of new materials and new technologies, these three kinds of downhole drilling tools have their own advantages . Among them, the turbo drilling tool uses high-pressure drilling fluid as the energy source to drive the drill bit downhole to complete the drilling work; the screw drilling tool makes the mud pumped by the mud pump flow through the bypass valve into the motor, and a certain pressure is formed at the inlet and outlet of the motor. The pressure difference pushes the rotor to rotate around the axis of the stator, and transmits the speed and torque to th...

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Problems solved by technology

[0003] However, the drill bits connected with the above three kinds of drilling tools often appear stuck during the drilling process due to the collapse or loss of blocks at the bottom of the well. How to quickly release the drill bit is the current research direction of downhole tools; Taking the screw drilling tool as an example, the drill bit is usually released by rotating the screw drilling tool casing to transmit the rotational power, but in general, since the motor is composed of a rubber stator and a metal rotor, turning the screw drilling tool casing will cause the motor stator to Slipping occurs with the rotor, which not only damages the rubber stator, but also prevents the rotational power from being transmitted to the drill bit, so that the drill bit still cannot operate, and ultimately affects drilling efficiency

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