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Energies 2017, 10(12), 2014;

Comparison of Model-Based Control Solutions for Severe Riser-Induced Slugs

Department of Energy Technology, Aalborg University, Esbjerg DK-6700, Denmark
Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim NO-7491, Norway
Author to whom correspondence should be addressed.
Received: 22 September 2017 / Revised: 3 November 2017 / Accepted: 23 November 2017 / Published: 1 December 2017
(This article belongs to the Special Issue Oil and Gas Engineering)
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Control solutions for eliminating severe riser-induced slugs in offshore oil & gas pipeline installations are key topics in offshore Exploration and Production (E&P) processes. This study describes the identification, analysis and control of a low-dimensional control-oriented model of a lab-scaled slug testing facility. The model is analyzed and used for anti-slug control development for both lowpoint and topside transmitter solutions. For the controlled variables’ comparison it is concluded that the topside pressure transmitter ( P t ) is the most difficult output to apply directly for anti-slug control due to the inverse response. However, as P t often is the only accessible measurement on offshore platforms this study focuses on the controller development for both P t and the lowpoint pressure transmitter ( P b ). All the control solutions are based on linear control schemes and the performance of the controllers are evaluated from simulations with both the non-linear MATLAB and OLGA models. Furthermore, the controllers are studied with input disturbances and parametric variations to evaluate their robustness. For both pressure transmitters the H loop-shaping controller gives the best performance as it is relatively robust to disturbances and has a fast convergence rate. However, P t does not increase the closed-loop bifurcation point significantly and is also sensitive to disturbances. Thus the study concludes that the best option for single-input-single-output (SISO) systems is to control P b with a H loop-shaping controller. It is suggested that for cases where only topside transmitters are available a cascaded combination of the outlet mass flow and P t could be considered to improve the performance. View Full-Text
Keywords: offshore; oil & gas; multi-phase flow; bifurcation; anti-slug; riser slug; flow control; stabilization offshore; oil & gas; multi-phase flow; bifurcation; anti-slug; riser slug; flow control; stabilization

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Pedersen, S.; Jahanshahi, E.; Yang, Z.; Skogestad, S. Comparison of Model-Based Control Solutions for Severe Riser-Induced Slugs. Energies 2017, 10, 2014.

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