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Automatic Start-up and Control of Artificially Lifted Wells
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Engineering Cybernetics.
2011 (English)MasteroppgaveStudent thesis
Abstract [en]

Artificial lift in oil wells using a downhole pump has received much attention the last decades and is established as a reliable and efficient lifting method. In particular, artificial lift using an electric submersible pump (EPS) has proven to be an important alternative in deep wells with high production rate requirements. This thesis investigate the problem of controlling the ESP intake pressure under rigid ESP operational constraints and input requirements, using the ESP frequency and choke position as control inputs. A mathematical model of a system containing ESP lifted wells is created and a control strategy that fulfil the control requirements is proposed. The model is an extension of the ESP model developed by Amundsen(2010) and contain four ESP lifted wells. Mathematical proof of open-loop stability is derived based on analysis of a linearized well model. Also, closed-loop stability for the linearized model is proved based on frequency analysis. The proposed control strategy is tested on the model in a range of different case study. The control system display a capability of minimizing the control error while keeping the ESP operated within the given constraints, with an optimal combination of control inputs. Simulation results indicate that the proposed control strategy is capable of handling a step-change in ESP intake pressure, ESP tripping, and ESP and booster-pump start-up/ shut-down.

Place, publisher, year, edition, pages
Institutt for teknisk kybernetikk , 2011. , 120 p.
URN: urn:nbn:no:ntnu:diva-23579Local ID: ntnudaim:5947OAI: diva2:668124
Available from: 2013-11-28 Created: 2013-11-28 Last updated: 2013-11-28Bibliographically approved

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