Bidirectional anti-fatigue short circuit for drill column

Abstract

The invention discloses a bidirectional anti-fatigue short circuit for a drill column used in the drilling engineering of the petroleum industry, particularly used for air under-balance drilling. The bidirectional anti-fatigue short circuit mainly comprises an upper joint, a short circuit main body and a lower joint. The short circuit main body consists of a spline outer barrel, a damping piston, an oil cylinder, a spring outer barrel, an upper disc spring set, a spring rod, a lower disc spring set and a buffering rubber. The disc spring sets and the damping piston are connected in series so as to play a role in retarding or absorbing longitudinal vibration simultaneously; the buffering rubber outside a spline can play a role in retarding peripheral vibration to reduce the adverse effect of accidental torque on the drill column; and through aerodynamic finite element simulation analysis for a short circuit shell structure, a single-blade hyperboloid structure optimized at the joint can reduce the erosion effect caused by high-speed airflow during air under-balance drilling so as to prolong the service life, improve the work efficiency and effectively protect a drill bit and the drill column. The bidirectional anti-fatigue short circuit has the advantages of simple structure, easy manufacture, detachment and easy maintenance.

Description

Technical field: [0001] The invention relates to a two-way anti-fatigue short connection for a drill string, belonging to a downhole tool used in drilling engineering in the petroleum industry, and is a shock-absorbing component connected with a drilling tool. Background technique: [0002] In the process of oil drilling operations, the drill bit will produce vertical and circumferential vibrations while producing rock breaking effects. These vibrations will impact the entire drill string, cause fatigue damage to certain parts of the drill string, reduce its service life, and cause safety hazards. The use of shock absorbers can effectively absorb these harmful vibration energy, store or convert it into other forms of energy, reduce fatigue damage, achieve the purpose of protecting the drilling tool, increasing the ROP and reducing the drilling cost. [0003] At present, most commonly used shock absorbers in domestic oil fields use hydraulic shock absorbers and spring shock absorbe...

AI Technical Summary

Problems solved by technology

These conventional shock absorbers are mainly aimed at reducing longitudinal vibration, and less shock absorbers are aimed at reducing circumferential torsional vibration

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