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Related Experiment Videos

Nonlinear model predictive control of managed pressure drilling.

Anirudh Nandan1, Syed Imtiaz1

  • 1Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, Canada A1B 3X5.

ISA Transactions
|April 13, 2017
PubMed
Summary

A novel nonlinear model predictive controller (NMPC) enhances managed pressure drilling (MPD) safety by automatically managing reservoir kicks and pressure fluctuations. This advanced control system ensures stable drilling operations under challenging conditions.

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Area of Science:

  • Petroleum Engineering
  • Control Systems Engineering

Background:

  • Managed pressure drilling (MPD) systems require robust control for safety and efficiency.
  • Reservoir kicks and operational uncertainties pose significant risks in drilling operations.

Purpose of the Study:

  • To propose a new nonlinear model predictive controller (NMPC) design for MPD systems.
  • To enhance safety and operational stability during drilling, particularly during reservoir kick events.

Main Methods:

  • The NMPC utilizes an output feedback control architecture with an offset-free formulation.
  • An active set method is employed for control input computation.
  • The controller features automatic switching between constant bottom hole pressure (CBHP) regulation and flow control mode.
Keywords:
Gas kickManaged pressure drilling (MPD)Nonlinear model predictive controller (NMPC)

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Main Results:

  • The NMPC successfully mitigates reservoir kicks by automatically adjusting the bottom hole pressure setpoint.
  • The controller effectively contains bottom hole pressure (BHP) during pipe connection sequences.
  • Satisfactory performance was achieved despite measurement noise and system uncertainties.

Conclusions:

  • The proposed NMPC design offers a robust solution for MPD systems, improving kick mitigation and operational stability.
  • The controller's adaptive capabilities enhance safety by managing downhole pressures within tunable thresholds.
  • This NMPC design demonstrates resilience to real-world drilling challenges, including noise and uncertainty.