Title :
Adaptive observer design for the bottomhole pressure of a managed pressure drilling system
Author :
Oyvind Nistad Stamnes; Jing Zhou;Glenn-Ole Kaasa;Ole Morten Aamo
Author_Institution :
Dept. of Eng. Cybern., Norwegian Univ. of Sci. & Technol., Norway
Abstract :
In this paper a reduced order observer that adapts to unknown friction and density, and estimates the bottomhole pressure in a well during drilling, is presented. The design is based on a newly developed third order nonlinear model with a nonlinear output equation containing a product between an unknown parameter and unmeasured state. Based on a Lyapunov approach the pressure estimate is shown to converge to the true pressure under reasonable conditions. Application of the observer to real data from a North Sea oil well demonstrates promising behaviour.
Keywords :
"Drilling","Observers","Pressure control","Friction","Boring","Inductors","Pumps","Fluid flow control","Reservoirs","Control systems"
Conference_Titel :
Decision and Control, 2008. CDC 2008. 47th IEEE Conference on
Print_ISBN :
978-1-4244-3123-6
DOI :
10.1109/CDC.2008.4738845