A flexible torque control system and control method capable of eliminating drill string stick-slip vibration

Abstract

The invention discloses a flexible torque control system capable of eliminating stick-slip vibration of a drill column and a control method. The flexible torque control system comprises a touch screen or an operation panel, a PLC (Programmable Logic Controller), a main motor, a high-speed counter, a torque meter, a servo motor and a servo driver, wherein the main motor is provided with an encoder. When the stick-slip vibration occurs, speed feedback signals are formed by detecting the torque and the rotating speed of the main motor / a turntable in real time; a drill rod soft torque control system predicts the operation states of underground components and calculates a speed compensation signal used as feedback compensation of the system according to the predicted state; by means of feedback compensation, the motor torque is changed; and through the improved torque, a drill bit is driven to fast leave a stick-slip region, so the tool sticking of the drill bit is eliminated, and the stick-slip vibration of the drill bit is inhibited. The flexible torque control system and the control method have the advantages that the drill bit can fast leave the stick-slip region, the tool sticking of the drill bit is eliminated, the stick-slip vibration of the drill bit is inhibited, the drilling cost is reduced, and the like.

Description

technical field [0001] The invention relates to a drill string control method for oil drilling, in particular to a flexible torque control system and control method capable of eliminating stick-slip vibration of the drill string. Background technique [0002] The drill string is an essential and important downhole tool in petroleum drilling engineering. It works in a long and narrow borehole filled with drilling fluid inside and outside, and usually bears loads such as tension, compression, bending, torsion and hydraulic force. The process of its movement Very complicated. During the drilling process, the main movement of the drill string is the downward movement of rotation, and it is always accompanied by various vibrations, mainly including lateral vibration, axial vibration and torsional vibration. Especially the stick-slip vibration in the torsional vibration is extremely harmful to drilling. During the stick-slip vibration process of the drill string, the rotational s...

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Problems solved by technology

[0003] The present invention aims to solve the shortcomings in the above-mentioned prior art, and provides a flexible torque control system and control method capable of eliminating drill string stick-slip vibration, so as to solve the serious impact of drill string vibration on drilling engineering.

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