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Ulf Jakob Flø Aarsnes

Senior Researcher

+47 51 87 56 71
Tullins gate 2, 0166 Oslo, Norway

I am a senior researcher with the Drilling and Well Modeling group at the NORCE Energy department, and the recipient of a MSCA Individual Fellowship and FRIPRO Mobility stipend. I am the project leader of the Robust Estimation and Control of Infinite Dimensional Systems (RECIDS) project: This project is focused on the development and implementation of model-based control and estimation algorithms for systems described by PDEs (i.e. infinite dimensional systems). Before the mobility stipend I received my PhD at NTNU in the Intelligent Drilling -- Automated Underbalanced Drilling Operations project, and then worked as a PostDoc in the DrillWell program. I spent one year from 2018-2019 working with Prof. Miroslav Krstic at the University of California at San Diego and one year from 2019-2020 working with Prof. Florent Di Meglio at Mines ParisTech, France. In May 2018 I organized the “Fourth International Colloquium on Non-linear dynamics and control of deep drilling systems” in Stavanger, Norway.

Ulf Jakob Flø Aarsnes


Energy & Technology

Research Groups

Energy Modelling and Automation

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Evaluation of distributed damping subs with active control for stick–slip reduction in drilling – Geoenergy Science and Engineering 2023
Boundary Control and Estimation for Under-Balanced Drilling with Uncertain Reservoir Parameters – IEEE Transactions on Control Systems Technology 2023
Modeling and Analysis of Non-Rotating Damping Subs for Removing Torsional Vibrations in Drilling – 2022
Self-Tuning Torsional Drilling Model for Real-Time Applications – American Control Conference (ACC) 2020
A phenomenological transient model of bit foundering – Journal of Petroleum Science and Engineering 2020
Robust control design of underactuated 2× 2 PDE-ODE-PDE systems – IEEE Control Systems Letters 2020
Closed-loop tool face control with the bit off-bottom – Journal of Process Control 2020
Robust output feedback stabilization of an ODE–PDE–ODE interconnection – Automatica 2020
Axial and torsional self-excited vibrations of a distributed drill-string – Journal of Sound and Vibration 2019
Delay robust control design of under-actuated PDE-ODE-PDE systems – American Control Conference (ACC) 2019
Effect of shock subs on self-excited vibrations in drilling systems – Journal of Petroleum Science and Engineering 2019
Extremum seeking for real-time optimal drilling control – American Control Conference (ACC) 2019
Estimating friction factors while drilling – Journal of Petroleum Science and Engineering 2019
Benchmarking of Industrial Stick-Slip Mitigation Controllers – IFAC-PapersOnLine 2018
Delay-Robust Control Design for Two Heterodirectional Linear Coupled Hyperbolic PDEs – IEEE Transactions on Automatic Control 2018
Effects of latency, motor inertia and filtering on stick-slip mitigation control – 2018
Stick-slip and torsional friction factors in inclined wellbores – MATEC Web of Conferences 2018
Robust output regulation of 2x 2 hyperbolic systems: Control law and Input-to-State Stability – American Control Conference (ACC) 2018
Avoiding stick slip vibrations in drilling through startup trajectory design – Journal of Process Control 2018
Flow and pressure control of underbalanced drilling operations using NMPC – Journal of Process Control 2018
Transient modeling of one-dimensional solid-liquid flow in conduits – International Journal of Multiphase Flow 2018
Dynamics of a distributed drill string system: Characteristic parameters and stability maps – Journal of Sound and Vibration 2018
Torsional vibrations with bit off bottom: Modeling, characterization and field data validation – Journal of Petroleum Science and Engineering 2018
State and Parameter Estimation of a Drift-Flux Model for Underbalanced Drilling Operations – IEEE Transactions on Control Systems Technology 2017
Review of two-phase flow models for control and estimation – Annual Reviews in Control 2016
Robust controller design for automated kick handling in managed pressure drilling – Journal of Process Control 2016
Real-time estimation of reservoir influx rate and pore pressure using a simplified transient two-phase flow model – Journal of Natural Gas Science and Engineering 2016
A simplified two-phase flow model using a quasi-equilibrium momentum balance – International Journal of Multiphase Flow 2016
Linear stability analysis of self-excited vibrations in drilling using an infinite dimensional model – Journal of Sound and Vibration 2016
A methodology for classifying operating regimes in underbalanced-drilling operations – SPE Journal 2016
Estimation of states and parameters of a drift-flux model with unscented kalman filter – IFAC-PapersOnLine 2015
A distributed parameter systems view of control problems in drilling – IFAC-PapersOnLine 2015
Fit-for-Purpose Modeling for Automation of Underbalanced Drilling Operations – 2014
Modeling and avoidance of heave-induced resonances in offshore drilling – SPE Drilling & Completion 2014
An adaptive observer for hyperbolic systems with application to UnderBalanced Drilling – Elsevier IFAC Publications / IFAC Proceedings series 2014
Limits of Controller Performance in the Heave Disturbance Attenuation Problem – 2013
Quantifying Error Introduced by Finite Order Discretization of a Hydraulic Well Model – 2012
Modeling for MPD operations with experimental validation – 2009
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