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Stabilizing Slug Control Using Subsea Choke Valve
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Engineering Cybernetics.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

This thesis study the possibility of riser slugging control in oshore oil production using a subsea choke valve. A 5-state simplied model of a well-pipelineriser system is introduced and tted to a reference model in the ow simulator OLGA. The models have two inputs, a subsea valve at the wellhead and a topside valve at the top of the riser. The eect the valves have on the behavior of the simplied model are tted to simulation data from the OLGA-model using bifurcation diagrams. An input-output controllability analysis of the simplied model show that anti-slug control using a subsea valve at the wellhead is more dicult than the conventional solution, which is to use the topside choke valve. This is conrmed by simulations on the simplied model using Hinfinity-controllers. Stabilizing control of the OLGA-model using the subsea valve was unsuccessful, despite testing dierent measurement combinations and control structures. A more promising solution for controlling riser slugging using a subsea valve is tested in OLGA, where a subsea valve located near the base of the riser can keep the system stable at riser slugging conditions. This is also seen in an experiment on a small scale ow lab.

Place, publisher, year, edition, pages
Institutt for teknisk kybernetikk , 2012. , 76 p.
Keyword [no]
ntnudaim:7131, MTTK teknisk kybernetikk, Ny energi, olje og gass
URN: urn:nbn:no:ntnu:diva-18525Local ID: ntnudaim:7131OAI: diva2:566010
Available from: 2012-11-08 Created: 2012-11-08

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