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A control system and method for eliminating drill string stick-slip vibration

A stick-slip vibration and control method technology, applied in the direction of auxiliary non-electric speed/acceleration control, etc., can solve the problems of reducing the working efficiency and life of the drill string, fatigue of the drill string, etc., to reduce the probability of downhole accidents and reduce drilling costs , Improve the effect of drilling speed

Active Publication Date: 2019-11-05
SICHUAN HONGHUA ELECTRIC
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a control system and method for eliminating the stick-slip vibration of the drill string, to solve the drill string fatigue caused by the stick-slip vibration of the drill string during the drilling process, and to reduce the drill string work efficiency and longevity

Method used

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  • A control system and method for eliminating drill string stick-slip vibration
  • A control system and method for eliminating drill string stick-slip vibration
  • A control system and method for eliminating drill string stick-slip vibration

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Embodiment Construction

[0037] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following description.

[0038] Such as figure 1 As shown, a control system for eliminating the stick-slip vibration of the drill string includes a touch screen, a programmable controller PLC and a motor with an encoder; the touch screen and the programmable controller PLC are connected to each other for displaying the motor speed The given value and actual value, motor torque actual value and limit value, motor speed, torque, operating status information and drill string setting parameters; the programmable logic controller PLC is used to eliminate drill string stickiness by controlling the speed of the motor slipping phenomenon; the motor is used to obtain the drill string system motion, and the motor speed and torque are controlled in real time by the programmab...

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Abstract

The invention discloses a control system and method for eliminating drill string stick-slip vibration. The steps of the method are as follows: S1. Set the drill string parameters after parameter initialization; S2. When the parameter stick-slip vibration indicates that the SSI reaches a certain value When the stick-slip vibration occurs, start the anti-stick-slip vibration system; S3. Set up the corresponding prevention system according to the size of the stick-slip vibration indicator SSI; S4. After the stick-slip vibration is generated, carry out the anti-stick-slip vibration system according to the actual speed fed back by the VFD of the frequency converter and the given speed of the motor. In comparison, after the PI adjustment controller is adjusted, a torque is added to the output of the VFD speed regulator of the frequency converter, and the speed of the motor is controlled by the frequency converter, so that the drill bit is out of the stick-slip area. It can effectively reduce the amplitude of stick-slip vibration or eliminate stick-slip vibration, reduce the degree of fatigue damage of the drill string, and reduce the probability of downhole accidents due to drill string fatigue; it can quickly keep the drill bit away from the stick-slip vibration area and increase the drilling speed. , Reduce drilling costs and improve drilling efficiency.

Description

technical field [0001] The invention relates to the technical field of stick-slip resistance of drill strings in petroleum drilling, in particular to a control system and method for eliminating stick-slip vibration of drill strings. Background technique [0002] During the drilling process, the drilling tool often "stops" due to excessive torque. When the torque reaches a certain value, the drilling tool will be released suddenly and quickly. This phenomenon is called stick-slip of the drilling tool. The stick-slip of the drilling tool is often accompanied by downhole vibration, which may easily cause the chipping of the drill bit, shorten the life of the drill bit, and in severe cases, cause the drill string or the lower drilling tool to twist. [0003] The stick-slip vibration of drilling tools is caused by strong torsional vibration and downhole friction. This kind of vibration is manifested as: the drill bit is stationary for a period of time, when the torque applied to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D13/46
CPCG05D13/46
Inventor 马双富吴显科
Owner SICHUAN HONGHUA ELECTRIC
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