System and method for controlling drill rod stick-slip vibration based on active damping method

Abstract

The invention discloses a system and method for controlling drill rod stick-slip vibration based on an active damping method. The method comprises the steps that (1) a motor main given rotating speed is given by a frequency changer through a PLC control system and is transmitted to a controlled object, and the motor actual rotating speed and the motor actual torque are obtained; (2) the motor actual rotating speed and the motor actual torque are transmitted to a control unit by the frequency changer; (3) meanwhile, combined structural information of a drill rod and a drill jig is transmitted to the control unit by a man-machine interaction device; (4) optimization operation is conducted on the motor actual rotating speed, the motor actual torque and the combined structural information of the drill rod and the drill jig by the control unit, an auxiliary given optimization rotating speed is obtained, and amplitude limiting is conducted on the auxiliary given optimization rotating speed by using the maximum rotating speed; (5) the auxiliary given optimization rotating speed is transmitted to the frequency changer by the control unit through a CAN bus, the auxiliary given optimization rotating speed is superposed with the motor main given rotating speed, and the rotating speed of a drive motor is controlled with the superposed rotating speed. According to the method, actual drill rod parameters can be accurately obtained, the actual rotating speed and the actual toque of the motor can be displayed in real time, and thus the purpose of controlling the stick-slip vibration of the drill rod is achieved.

Description

Technical field [0001] The invention belongs to the technical fields of petroleum drilling, geological prospecting and the like, and relates to a system and method for suppressing stick-slip vibration of a drill pipe based on an active damping method, a bus communication technology and a human-computer interaction technology. Background technique [0002] In the process of oil drilling, due to the complex formation and uncertain drill pipe movement, drill pipe vibration is prone to occur, including drill pipe lateral vibration, axial vibration and stick-slip vibration. Among them, stick-slip vibration is the torque oscillation caused by the friction torque between the drill bit and the formation. The bit speed may stop or rotate, and the instantaneous rotation speed is very high, which easily causes the performance of the drill pipe and the bit to deteriorate; this phenomenon not only affects the drilling efficiency, but also threatens the drilling Therefore, it is necessary to t...

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Problems solved by technology

The system solves the problems of complex hardware connection, unstable

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