Browsing Publikasjoner fra CRIStin - NTNU by Author "Kaasa, Glenn-Ole"
Now showing items 1-8 of 8
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A Framework for Fault Diagnosis in Managed Pressure Drilling Applied to Flow-Loop Data
Willersrud, Anders; Imsland, Lars Struen; Pavlov, Alexey; Kaasa, Glenn-Ole (Journal article; Peer reviewed, 2013)Data from a medium-scale horizontal flow loop test facility is used to test fault diagnosis in managed pressure drilling. The faults are downhole incidents such as formation influx, fluid loss, drillstring washout, pack-off, ... -
Adaptive approximation-based estimation of downhole pressure in managed pressure drilling
Imsland, Lars Struen; Kaasa, Glenn-Ole (Journal article; Peer reviewed, 2012)Low-complexity multi-model algorithms for adaptive bottomhole pressure estimation in drilling is derived, and theoretical and practical conditions for convergence (persistency of excitation) discussed, assuming a) topside ... -
Design and comparison of adaptive estimators for Under-balanced Drilling
Nikoofard, Amirhossein; Johansen, Tor Arne; Kaasa, Glenn-Ole (Book, 2014)Real time knowledge of total mass of gas and liquid in the annulus and geological properties of the reservoir is very useful in many active controllers, fault detection systems and safety applications in the well during ... -
Design and comparison of adaptive estimators for Under-Balanced Drilling
Nikoofard, Amirhossein; Johansen, Tor Arne; Kaasa, Glenn-Ole (Journal article, 2014)Real time knowledge of total mass of gas and liquid in the annulus and geological properties of the reservoir is very useful in many active controllers, fault detection systems and safety applications in the well during ... -
Evaluation of Lyapunov-based adaptive observer using low-order lumped model for estimation of production index in Under-Balanced Drilling
Nikoofard, Amirhossein; Johansen, Tor Arne; Kaasa, Glenn-Ole (Journal article; Peer reviewed, 2015)A distributed drift-flux model and a low-order lumped model describing a multiphase (gas-liquid) flow in the well during Under-Balanced Drilling (UBD) has been presented. This paper presents a novel nonlinear adaptive ... -
Pressure wave propagation in Managed Pressure Drilling- model comparison with real life data
Berg, Christian; Stakvik, Jon Åge; Lie, Bernt; Vågsæther, Knut; Kaasa, Glenn-Ole (Journal article; Peer reviewed, 2019)Drilling for oil and gas is a complex process, involving pumping of fluid through kilometers of pipes. Even though the drilling fluid has a high speed of sound (˜1000 m/s), the large lengths involved make pressure wave ... -
Reservoir characterization in Under-balanced Drilling using Low-Order Lumped Model
Nikoofard, Amirhossein; Kaasa, Glenn-Ole; Johansen, Tor Arne (Journal article; Peer reviewed, 2017)Estimation of the production index of oil and gas from the reservoir into the well during under-balanced drilling (UBD) is studied. This paper compares a Lyapunov-based adaptive observer and a joint unscented Kalman filter ... -
State and Parameter Estimation of a Drift-Flux Model for Underbalanced Drilling Operations
Nikoofard, Amirhossein; Aarsnes, Ulf Jakob Flø; Johansen, Tor Arne; Kaasa, Glenn-Ole (Journal article; Peer reviewed, 2017)We consider a drift-flux model (DFM) describing multiphase (gas-liquid) flow during drilling. The DFM uses a specific slip law, which allows for transition between single and two phase flows. With this model, we design ...