Blar i NTNU Open på forfatter "Nikoofard, Amirhossein"
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Control and Adaptive Observer Designs for Managed Pressure and Under Balanced Drilling
Nikoofard, Amirhossein (Doctoral thesis at NTNU;2016:24, Doctoral thesis, 2016) -
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 ... -
Design and Comparison of Constrained MPC with PID Controller for Heave Disturbance Attenuation in Offshore Managed Pressure Drilling Systems
Nikoofard, Amirhossein; Johansen, Tor Arne; Mahdianfar, Hessam; Pavlov, A (Journal article, 2014)This paper presents a constrained finite horizon model predictive control (MPC) scheme for regulation of the annular pressure in a well during managed pressure drilling from a floating vessel subject to heave motion. In ... -
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 ... -
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 ... -
Reservoir Characterization in Under-balanced Drilling with Nonlinear Moving Horizon Estimation with Manual and Automatic Control Conditions
Nikoofard, Amirhossein; Molaei, A; Johansen, Tor Arne (Peer reviewed; Journal article, 2020)This paper discusses the state estimation of the Under-Balanced Drilling (UBD) system in the presence of parametric uncertainties. During this process, the production indices of oil and gas from the reservoir into the well ... -
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 ...