System and method for restraining stick-slip vibration of drill rod based on self adaptation method

A technology of stick-slip vibration and self-adaptive method, which is applied in the automatic control system of drilling, program control in sequence/logic controller, drilling equipment, etc. It can solve the problem of unsatisfactory realization effect, unstable system operation and complicated hardware connection And other issues
CN103941632AActive Publication Date: 2014-07-23NORTHWESTERN POLYTECHNICAL UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Publication Date
2014-07-23

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Abstract

The invention discloses a system and method for restraining stick-slip vibration of a drill rod based on a self adaptation method. The method comprises the steps that (1) a transducer provides a main given rotation speed of a motor through a PLC system and transmits the rotation speed to a controlled object, and the drill rod is driven to rotate; (2) the transducer transmits the actual rotation speed of the motor and the actual torque of the motor to a control unit through a CAN bus; (3) the control unit enables the rotation speed of a drill bit and the main given rotation speed of the motor to be combined for the optimization algorithm to obtain an auxiliary given optimization rotation speed; (4) the control unit transmits the auxiliary given optimization rotation speed to the transducer through the CAN bus, the auxiliary given optimization rotation speed and the main given rotation speed of the motor are subjected to superposition, and the superposed rotation speed controls the rotation speed of a drive motor. The method can accurately obtain parameters of the controlled object, the actual rotation speed and the actual torque of the motor are displayed in real time, and the purpose of restraining stick-slip vibration of the drill rod is achieved.
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Description

technical field

[0001] The invention belongs to the technical fields of oil drilling, geological exploration and the like, and relates to a system and method for suppressing stick-slip vibration of drill pipes based on self-adaptive method, bus communication technology and human-computer interaction technology. Background technique

[0002] Due to the complex formation and uncertain drill pipe movement during oil drilling, drill pipe vibration is prone to occur, including lateral vibration, axial vibration and stick-slip vibration of the drill pipe. Among them, the stick-slip vibration is the torque oscillation caused by the frictional moment between the drill bit and the formation. The speed of the drill bit may stop or rotate, and the instantaneous speed is very large, which may easily cause the performance deterioration of the drill pipe and the drill bit; this phenomenon not only affects the drilling efficiency but also threatens the drilling efficiency. Therefore, it is...

Claims

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