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dc.contributor.advisorFoss, Bjarne Antonnb_NO
dc.contributor.advisorSagatun, Svein Ivarnb_NO
dc.contributor.advisorHasan, Agusnb_NO
dc.contributor.authorRonen, Jonathannb_NO
dc.date.accessioned2014-12-19T14:03:18Z
dc.date.available2014-12-19T14:03:18Z
dc.date.created2010-11-24nb_NO
dc.date.issued2010nb_NO
dc.identifier372103nb_NO
dc.identifierntnudaim:5754nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/260248
dc.description.abstractThis thesis was set to tackle the gas coning problem in oil-rim reservoirs with horizontal wells. The focus was short term production planning in the sub-critical phase only. Different controllers were developed and assessed based on the objective of net-present-value (NPV) of oil produced in the sub-critical phase. The reservoir model is a 1-D partial differential equation describing the dynamics of the gas-oil contact (GOC), for a homogeneous reservoir. Gas coning is considered to be the deformation of the GOC towards the well. Several controllers were developed and assessed alongside control laws from previous research: (i) the Backstepping method was used to develop a state-feedback controller, along with an observer. Coupled they make the Backstepping output-feedback controller. (ii) an output-feedback controller based on the structure proposed by previous research. (iii) linear-quadratic optimal control. An extended Kalman filter was also considered as a state observer, alongside the Backstepping observer. The backstepping controller did not deliver an increase of sub-critical payout which warrants the complicated structure of an observer-controller pair. It was even outperformed by simpler, output-feedback control laws. The optimal linear-quadratic controller achieved the best NPV of sub-critical production by far. This makes it the most attractive control strategy presented, even when considering that a real-world implementation will need to be paired with a state observer.nb_NO
dc.languageengnb_NO
dc.publisherInstitutt for teknisk kybernetikknb_NO
dc.subjectntnudaim:5754no_NO
dc.subjectSIE3 teknisk kybernetikkno_NO
dc.subjectReguleringsteknikkno_NO
dc.titleBoundary Control of the Gas Coning Problemnb_NO
dc.typeMaster thesisnb_NO
dc.source.pagenumber77nb_NO
dc.contributor.departmentNorges teknisk-naturvitenskapelige universitet, Fakultet for informasjonsteknologi, matematikk og elektroteknikk, Institutt for teknisk kybernetikknb_NO


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