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Stick-Slip Vibration Suppression in Drill String Using Observer-Based LQG Controller.

Rami Riane1, Mohamed Zinelabidine Doghmane1,2, Madjid Kidouche1

  • 1Laboratory of Applied Automatic, Department of Automation, Faculty of Hydrocarbons and Chemistry, University M'hamed Bougara of Boumerdes, Boumerdes 35000, Algeria.

Sensors (Basel, Switzerland)
|August 26, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces an LQG observer-based controller to eliminate severe stick-slip vibrations in rotary drilling systems. The approach enhances drilling efficiency and reduces operational costs by improving drill string stability.

Keywords:
LQGSimScape/Matlab environmentdrill stringobserver-based controllerrotary drilling systemsstick-slip vibrationstorque on bit

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Area of Science:

  • Engineering
  • Control Systems
  • Petroleum Engineering

Background:

  • Rotary drilling systems are crucial for hydrocarbon exploration and production.
  • Drill string vibrations, particularly torsional stick-slip, reduce efficiency and increase costs.
  • Existing methods struggle to effectively mitigate these severe vibrations.

Purpose of the Study:

  • To eliminate severe stick-slip vibrations in rotary drilling systems using an LQG observer-based controller.
  • To address nonlinear rock-bit interactions and unmeasurable bit rotational velocity.
  • To enhance the stability and efficiency of hydrocarbon exploration and production operations.

Main Methods:

  • Designed an LQG (Linear Quadratic Gaussian) observer to estimate unknown model inputs based on surface measurements.
  • Implemented the observer-based controller in a 10-degree-of-freedom drill string model.
  • Validated performance through simulations in SimScape/Matlab and compared with other control strategies.

Main Results:

  • The proposed LQG observer-based controller effectively suppressed severe stick-slip vibrations.
  • Demonstrated good robustness against various simulation scenarios and structured disturbances.
  • Outperformed other controllers, including H∞, in terms of performance and sensitivity.

Conclusions:

  • The LQG observer-based controller is a highly effective solution for mitigating stick-slip vibrations in rotary drilling.
  • The approach offers improved drilling efficiency and reduced operational expenses.
  • Recommended for implementation in smart rotary drilling systems for enhanced performance.