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Control system and method for eliminating stick-slip vibration of drill string

A stick-slip vibration and control system 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, and the fatigue of the drill string, so as to reduce the probability of downhole accidents and reduce drilling costs. , the effect of improving drilling efficiency

Active Publication Date: 2017-04-26
SICHUAN HONGHUA ELECTRIC
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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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  • Control system and method for eliminating stick-slip vibration of drill string
  • Control system and method for eliminating stick-slip vibration of drill string

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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 stick-slip vibration of a drill string. The method comprises steps that 1, drill string parameters are set after parameter initialization; S2, when a parameter stick-slip vibration indication SSI reaches a certain value, an stick-slip vibration prevention system starts; S3, according to amplitude of the parameter stick-slip vibration indication SSI, a corresponding prevention system is set; and S4, comparison is carried out according to an actual speed fed back by a frequency converter VFD and a given speed of the motor after stick-slip vibration is generated, adjustment is carried out through a PI adjusting controller, after a torque is added to the frequency converter VFD and is outputted through a speed adjuster, a rotation speed of the motor is controlled through the frequency converter, and a drill bit is made to leave a stick-slip area. Through the method, amplitude of stick-slip vibration can be effectively reduced, or stick-slip vibration can be eliminated, a fatigue damage degree of the drill string is alleviated, and underground accident probability caused by drill string fatigue is reduced. The method is advantaged in that the drill bit is made to leave the stick-slip vibration area, a drill speed is improved, well drilling cost is reduced, and well drilling efficiency is improved.

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 Applications(China)
IPC IPC(8): G05D13/46
CPCG05D13/46
Inventor 马双富吴显科
Owner SICHUAN HONGHUA ELECTRIC
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