Title :
Observer-based control of a managed pressure drilling system
Author :
Zhou, J. ; Stamnes, O.N. ; Aamo, O.M. ; Kaasa, G.-O.
Author_Institution :
Dept. of Eng. Cybern., Norwegian Univ. of Sci. & Technol., Trondheim
Abstract :
During well drilling, the annular downhole pressure should be precisely controlled throughout the well bore continuously while drilling. A choke valve and a back pressure pump are used to control the annular pressure. This paper presents a nonlinear observer-based control scheme to stabilize the annular pressure profile. A simple mechanistic model is developed to capture the dominant phenomena of the drilling system and for the observer and model-based control design. A new nonlinear adaptive observer is developed for state estimations. The developed nonlinear controller is designed to stabilize the annular pressure and achieve asymptotic tracking.
Keywords :
control system synthesis; drilling; nonlinear control systems; observers; pressure control; pumps; stability; valves; annular downhole pressure; annular pressure control; asymptotic tracking; back pressure pump; choke valve; mechanistic model; nonlinear adaptive observer; nonlinear observer-based control scheme; observer-based control; pressure drilling system; state estimations; well drilling; Boring; Control systems; Drilling; Inductors; Observers; Pi control; Pressure control; Pressure measurement; Proportional control; Valves; Drilling control; nonlinear observer; parameter estimation; tracking;
Conference_Titel :
Control and Decision Conference, 2008. CCDC 2008. Chinese
Conference_Location :
Yantai, Shandong
Print_ISBN :
978-1-4244-1733-9
Electronic_ISBN :
978-1-4244-1734-6
DOI :
10.1109/CCDC.2008.4597975