An auxiliary downhole drilling tool

Abstract

The present invention provides an auxiliary downhole drilling tool, comprising: a hollow tubular mandrel, one end of which is provided with a first joint; an elastic torsion member arranged outside the mandrel; a trigger impact cylinder; and a second joint connected to the mandrel, the second joint forms a fixed connection with the elastic torsion member and the drill bit, wherein the trigger impact cylinder is configured to have The first state where the drill bit is separated from the second joint under normal working conditions, and the second state where the drill bit collides with the second joint when stick-slip vibration occurs, and the elastic torsion member is configured to be able to When the stick-slip vibration of the drill bit occurs, the differential velocity value between the drill bit and the trigger impact cylinder is converted into the elastic potential energy of the elastic torsion member, and the elastic potential energy is automatically stored and released alternately, thereby providing The bit provides rock breaking torque.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering drilling, in particular to an auxiliary downhole drilling tool. In particular, it is a speed-increasing tool for improving the drilling speed of the drill bit and prolonging the service life of the drill bit. Background technique [0002] In petroleum engineering drilling construction, the existing conventional bottom hole assembly includes "drill bit + drill collar + stabilizer + drill collar", or includes "drill bit + screw rod + drill collar + stabilizer + drill collar". According to the actual working conditions at the drilling site, it is found that in complex formations such as hard formations, gravel formations, and interlaced soft and hard formations, the bottom hole assembly has adverse working conditions such as bounce, whirl, and stick-slip. Among them, the bouncing and stick-slip phenomenon of the drill bit is serious, which easily causes the early damage of the drill bi...

AI Technical Summary

Problems solved by technology

Most of these speed-up tools convert hydraulic energy into mechanical energy, resulting in large pressure loss and high pump pressure, and the use effect of speed-up tools is affected by drilling fluid density, drilling pump displacement, pump conditions, well depth, temperature, and plugging materials. Restricted by various factors such as particle size

In addition, downhole tools such as shock absorbers, oscillators, and impactors commonly used in the field have relatively single functions.

The functions of stabilizing drilling parameters such as pressure on bit and torque and increasing the rock-breaking energy of the drill bit cannot be realized at the same time. In complex formations, the drill bit will still bear a large impact load, resulting in chipping and excessive wear of the PDC bit.

Although shock-absorbing booster drilling speed-up tools and vibration-absorbing pulse jet drilling speed-up tools can absorb the longitudinal vibration of the drill string and improve the hydraulic energy of the drill bit for rock breaking, the parts and components of such tools are relatively complicated in structure and cannot completely eliminate the torsional vibration of the drill string. The special jet channel is easy to block

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