• Adaptive Observer for Bottomhole Pressure During Drilling 

      Stamnes, Øyvind Nistad (Master thesis, 2007)
      To satisfy the increasing petroleum consumption on a world wide basis there is a need to find new resources. As mature fields are drained, reservoir pressure falls, which again leads to tight pressure margins. To reduce ...
    • Nonlinear Estimation with Applications to Drilling 

      Stamnes, Øyvind Nistad (Doctoral Theses at NTNU, 1503-8181; 2011:60, Doctoral thesis, 2011)
      This thesis addresses the topic of nonlinear estimation and its applications. Particular emphasis is given to downhole pressure estimation for Managed Pressure Drilling (MPD), but due to the mathematical similarities of ...
    • Parameter estimation for estimation of bottom hole pressure during drilling. 

      Vea, Hans Kristian (Master thesis, 2009)
      In this thesis we examine four bottom hole pressure estimators based on adaptive estimation of the friction pressure for the drill string and the annulus. Knowledge about the bottom hole pressure is crucial to achieve ...