Earticle

초록

영어

The bottom hole pressure should be controlled during the pipe connection procedure in a drilling operation to prevent the possibility of oil well blow out, to avoid the collapse of the well and to prevent the fracturing of the bore walls. It should be maintained within a window defined by the collapse pressure as the lower limit and by the fracture pressure as the upper limit. This paper describes the use of a nonlinear model predictive controller (NMPC) to maintain the bottom hole pressure. In addition to a topside choke valve, backpressure pump is also used as a control input. While connecting an additional pipe segment, the injection of the drill fluid is completely stopped. The drill fluid pulse telemetry system that is used in the measurement and transmission of the bottom hole pressure may not function properly and there will be absence of signal while the pipe is being connected. A nonlinear estimator, the unscented Kalman filter (UKF) is used for the continuous estimation of the fluid flows and pressures at different sections of the well being drilled. Simulation results show that the bottom hole pressure can be managed effectively during the drilling of an oil well with nonlinear estimation and control.

목차

Abstract
 1. Introduction
 2. Simple Model of a Drilling Operation
 3. Pipe Connection during Drilling
 4. Estimation of Bottom Hole Pressure
  4.1. Estimation in the Absence of Measurement Data
 5. Control of Bottom Hole Pressure
  5.1. Formulation of Optimal Control Problem
  5.2. Simulation Results
  5.3. Comment on Computational Time
 6. Conclusion
 References

키워드

저자

• Roshan Sharma [ Department of Electrical Engineering, IT and Cybernetics, Telemark University College, Porsgrunn, Norway ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  International Journal of Control and Automation

• 간기

  월간

• pISSN

  2005-4297

• 수록기간

  2008~2016

• 십진분류

  KDC 505 DDC 605