Well drilling self-excited vibration and stick-slip vibration simulation experiment device

Abstract

The invention discloses a well drilling self-excited vibration and stick-slip vibration simulation experiment device. A stepping motor rotates to drive a sliding block and a servo motor to feed downwards; a drill bit downwards cuts a simulated rock stratum material in a barrel-shaped container; rotation speeds and torques of the stepping motor and the servo motor can be transmitted into a notebookcomputer through a motor driver and a motor controller. A pressure sensor, a torsion sensor, a photoelectric sensor and an ultrasonic displacement sensor which are installed on a bottom plate transmit cutting force, torsion, rotating speed and drilling speed of a drill bit to a notebook computer through a data acquisition card so as to simulate a real drilling working process, and reference basesare provided for analysis of self-excited vibration and stick-slip vibration of a drill stem through the data.

Description

technical field [0001] The invention belongs to the technical field of drilling, and relates to a drilling self-excited vibration and stick-slip vibration simulation experiment device. Background technique [0002] Drilling technology plays a vital role in the exploitation of mineral resources such as oil, natural gas and coal. The drilling process is a regenerative cutting process. When the drilling depth is shallow, the contact stress between the drill bit and the rock formation is small, and the vibration of the drill string is mainly due to the self-excited vibration caused by the regenerative cutting effect; as the drilling depth increases, the drill bit and the rock formation As the contact stress gradually increases, the friction between the drill bit and the rock increases, resulting in stick-slip vibration of the drill string system. Self-excited vibration can easily cause dynamic instability of the drill string system, while stick-slip vibration can easily lead to...

AI Technical Summary

Problems solved by technology

[0005] For the vibration simulation device of the drill string system in the prior art, there are generally the following deficiencies: 1. The drilling fluid type device cannot directly test the pressure value of the drill bit end, and only calculate the pressure of the drill bit end by the tension transmitted to the lug of the hydraulic cylinder , imprecise, not direct; 2. No drilling fluid device can not simulate the real cutting process of the drill bit, and can not simulate the self-excited vibration of the drill string; 3. It is impossible to directly test the torque and speed at the end of the drill bit and the input torque and speed at the top of the drill string 4. It cannot simulate the stick-slip vibration in the real cutting process

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