Method and system for stick-slip mitigation
A method and system for dampening a stick-slip vibration. The method may comprise determining at least one frequency of a stick-slip vibration; determining mechanical properties of the drilling system; producing a torque signal from a controller having at least a second order; controlling a rotational speed of a top drive from the torque signal produced by the controller; and damping stick-slip vibration of the drilling system. The system may further comprise a drill string and a bottom hole assembly may be connected to the drill string. A drill bit may be connected to the bottom hole assembly and an information handling system may be connected to the drilling system.
1. A method for dampening a stick-slip vibration in drilling, comprising:
determining two or more frequencies of stick-slip vibration;
determining mechanical properties of a drilling system;
initiating a torque output from a controller using a revolutions per minute (RPM) setpoint, wherein the controller utilizes a second order linear differential equation;
controlling a rotational speed of a top drive from the torque signal produced by the controller; and
absorbing the two or more frequencies of stick-slip vibration along a drill string concurrently.
2. The method of claim 1 , further comprising analyzing surface measurements to determine the two or more frequencies of stick-slip vibration.
3. The method of claim 2 , wherein the surface measurements comprise RPM, torque, calculation from a model, analyzing downhole measurement data, or any combination thereof.
4. The method of claim 1 , wherein the mechanical properties comprise equivalent top drive inertia, shear modulus, or density and moment of the drill string.
5. The method of claim 1 , wherein the controller is implemented with a top drive variable-frequency drive.
6. The method of claim 5 , wherein the top drive variable-frequency drive comprises an internal feedback loop.
7. The method of claim 1 , further comprising altering the controller with a feedback loop.
8. The method of claim 7 , wherein the feedback loop comprises a filter.
9. The method of claim 8 , wherein the filter is the setpoint filter.
10. The method of claim 1 , further comprising identifying the two or more frequencies of stick-slip vibration from a surface torque frequency map.
11. A drilling system comprising:
a top drive, wherein the top drive comprises a top drive variable-frequency drive;
a controller configured to receives an input of a revolutions per minute (RPM) setpoint that is processed with at least a second order linear differential equation that produces a torque signal and wherein the RPM setpoint initiates a torque output from the controller;
a drill string, wherein the drill string is attached to the top drive;
a bottom hole assembly, wherein the bottom hole assembly is connected to the drill string;
a drill bit, wherein the drill bit is connected to the bottom hole assembly; and
an information handling system, wherein the information handling system is configured to record two or more frequencies of stick-slip vibration and control the drill string to absorb the two or more frequencies of stick-slip vibration concurrently on the drill string by controlling the top drive.
12. The drilling system of claim 11 , wherein a feedback loop is attached to the controller and the feedback loop comprises a filter.
13. The drilling system of claim 12 , wherein the filter is a setpoint filter.
14. The drilling system of claim 11 , wherein the information handling system is configured to analyze surface measurements to determine the two or more frequencies of stick-slip vibration.
15. The drilling system of claim 14 , wherein the surface measurements comprise RPM, torque, calculation from a model, analyzing downhole measurement data, or any combination thereof.
16. The drilling system of claim 11 , wherein the information handling system is configured to determine one or more mechanical properties include equivalent top drive inertia, shear modulus, or density and moment of a drill string.
17. The drilling system of claim 11 , wherein the information handling system is configured to identify the two or more frequencies of stick-slip vibration from a surface torque frequency map.
18. The drilling system of claim 11 , wherein the top drive variable-frequency drive comprise an internal feedback loop.
19. The drilling system of claim 11 , wherein the information handling system is configured to alter the controller with a feedback loop.
20. A drilling system comprising:
a top drive, wherein the top drive comprises a top drive variable-frequency drive
a controller configured to receives an input of a revolutions per minute (RPM) setpoint that is processed with at least a second order linear differential equation that produces a torque signal and wherein the RPM setpoint initiates a torque output from the controller;
a feedback loop attached to the controller and the feedback loop comprises a filter that is a set point filter;
an internal feedback loop attached to the controller that transmits RPM measurements;
a drill string, wherein the drill string is attached to the top drive;
a bottom hole assembly, wherein the bottom hole assembly is connected to the drill string;
a drill bit, wherein the drill bit is connected to the bottom hole assembly; and
an information handling system, wherein the information handling system is configured to record two or more frequencies of stick-slip vibration and control the drill string to absorb the two or more frequencies of stick-slip vibration concurrently on the drill string by controlling the top drive.