Browsing NTNU Open by Author "Kaasa, Glenn-Ole"
Now showing items 1-15 of 15
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A Comparison of Observers for Estimation of the Bottomhole Pressure.
Opsanger, Eirik Nyland (Master thesis, 2009)New offshore oil recourses that are developed are more difficult to drill and increase the requirements to the technology in the offshore industry. A relatively new technology is Managed Pressure Drilling where a choke ... -
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 ... -
Control Design for Backstepping and Adaptive Backstepping Controllers in MPD
Johansen, Martin Bergene (Master thesis, 2017)In the field of oil drilling there is a concept known as Managed Pressure Drilling. In Managed Pressure Drilling one relies on pumps in combination with chokes (valves) in order to maintain a certain pressure at the bottom ... -
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 ... -
Estimation of Bottomhole Pressure for Managed Pressure Drilling: Comparison of Nonlinear Estimators
Løvik, Pål Skønberg (Master thesis, 2011)To avoid hole stability problems in an increasingly fierce drilling environment, the demand for accurate control of the pressure profile during drilling operations is rising. As standard instrumentation of drilling rigs ... -
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 ... -
L1 Adaptive Control in Managed Pressure Drilling
Pedersen, Torbjørn (Master thesis, 2009)The control solution is a crucial part of Managed Pressure Drilling. Existing solutions are often based on Proportional plus Integral (PI) control and have several drawbacks, mainly poor performance for some common drilling ... -
Modeling and Control for Managed Pressure Drilling from Floaters: Heave Compensation by Automatic Nonlinear Control
Landet, Ingar Skyberg (Master thesis, 2011)Managed pressure drilling is a sophisticated pressure control method which is intended to meet increasingly high demands in drilling operations in the oil and gas industry. With this method, the well is pressurized and the ... -
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 ... -
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 ... -
Stabilization of slugging by sliding mode control
Reinsnes, Ståle E. (Master thesis, 2009)The objective of this master thesis is to design, implement, and evaluate sliding mode control (SMC) applied to stabilize slugging using only the downhole pressure as measurement. The pros and cons of the resulting ... -
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 ...