Model-based control of slugging flow: An experimental case study

In this paper, we compare two solutions for suppressing slug flow in pipes conveying a diphasic fluid by active feedback control of the outlet (production) choke. Conventionnaly, a non-collocated PI controller is used to stabilize the measured inlet pressure. Unfortunately, this method lacks robustness to changes in operating conditions and reveals difficult to calibrate. In this work, we propose a model-based approach to design a nonlinear state-feedback control law based on a first principles model of the slugging phenomenon. A theoretical proof of convergence of the closed-loop model is provided, as well as an experimental validation of these results on a mid-scale testbench.

[1]  Ovadia Shoham,et al.  The elimination of severe slugging—experiments and modeling , 1996 .

[2]  Kjetil Havre,et al.  Automatic Control of Unstable Gas Lifted Wells , 1999 .

[3]  Yehuda Taitel,et al.  Two-Phase Slug Flow , 1990 .

[4]  Olav Slupphaug,et al.  Active Feedback Control of Unstable Wells at the Brage Field , 2002 .

[5]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[6]  Emmanuel Duret.  Dynamique et contrôle des écoulements polyphasiques , 2005 .

[7]  Florent Di Meglio,et al.  A first principle model for multiphase slugging flow in vertical risers , 2009, Proceedings of the 48h IEEE Conference on Decision and Control (CDC) held jointly with 2009 28th Chinese Control Conference.

[8]  Espen Storkaas.  Stabilizing control and controllability. Control solutions to avoid slug flow in pipeline-riser systems , 2005 .

[9]  Kjetil Havre,et al.  Active Feedback Control as the Solution to Severe Slugging , 2001 .

[10]  A. Courbot.  Prevention of Severe Slugging in the Dunbar 16' Multiphase Pipeline , 1996 .

[11]  A. Dukler,et al.  Hydrodynamic model for gas‐liquid slug flow in vertical tubes , 1983 .

[12]  John-Morten Godhavn,et al.  New slug control strategies, tuning rules and experimental results , 2005 .

[13]  Hu Bin,et al.  Gas-lift Instability Resulted Production Loss and Its Remedy by Feedback Control: Dynamical Simulation Results , 2003 .

[14]  Eric Heintze,et al.  Simulation of Process to Control Severe Slugging: Application to the Dunbar Pipeline , 1999 .

[15]  Ovadia Shoham,et al.  A Comprehensive Mechanistic Model for Upward Two-Phase Flow in Wellbores , 1990 .

[16]  A. Dukler,et al.  A Model for Gas-Liquid Slug Flow in Horizontal and Near Horizontal Tubes , 1975 .

[17]  Bjarne A. Foss,et al.  Stabilization of Gas Lifted Wells Based on State Estimation , 2004 .

[18]  Emmanuel Duret,et al.  Multiphase Production Control: Application to Slug Flow , 2002 .