Blar i Institutt for teknisk kybernetikk på forfatter "Jahanshahi, Esmaeil"

Viser treff 1-7 av 7

    • A two-layer structure for stabilization and optimization of an oil gathering network 

      Codas, Andres; Jahanshahi, Esmaeil; Foss, Bjarne Anton (Journal article; Peer reviewed, 2016)
      In this work, we present the control and optimization of a network consisting of two gas-lifted oil wells, a common pipeline-riser system and a separator. The gas-lifted oil wells may be open-loop unstable. The regulatory ...

    • Anti-Slug Control Experiments Using Nonlinear Observers 

      Jahanshahi, Esmaeil; Skogestad, Sigurd; Grøtli, Esten Ingar (Journal article; Peer reviewed, 2013)
      Abstract: To prevent slug-flow on offshore oil production units, controlling a subsea pressure is the recommended solution. However, the subsea pressure is not often available as a measurement. The top-side pressure is ...

    • Anti-Slug Control with Non-Linear State Estimation 

      Syre, Terese Vardenær (Master thesis, 2012)
      In offshore production, the two-phase mixture of oil and gas is transported from the seabed oil wells to the surface facilities by pipelines and risers. The two-phase flow can have different flow regimes, where severe ...

    • Nonlinear model-based control of two-phase flow in risers by feedback linearization 

      Jahanshahi, Esmaeil; Skogestad, Sigurd; Grøtli, Esten Ingar (Journal article, 2013)
      Active control of the production choke valve is the recommended solution to prevent severe slugging flow conditions at offshore oilfields. The slugging flow constitutes an unstable and highly nonlinear system; the gain of ...

    • Plantwide control of an oil production network 

      Jahanshahi, Esmaeil; Krishnamoorthy, Dinesh; Codas Duarte, Andres; Foss, Bjarne Anton; Skogestad, Sigurd (Peer reviewed; Journal article, 2020)
      In this paper, we consider Real-Time Optimization (RTO) and control of an oil production system. We follow a systematic plantwide control procedure. The process consists of two gas-lift oil wells connected to a pipeline-riser ...

    • Spline Fluid Models for Optimization 

      Jahanshahi, Esmaeil; Grimstad, Bjarne André; Foss, Bjarne Anton (Journal article; Peer reviewed, 2016)

    • Stabilizing Slug Control Using Subsea Choke Valve 

      Lieungh, Mats (Master thesis, 2012)
      This thesis study the possibility of riser slugging control in oshore oil productionusing a subsea choke valve. A 5-state simplied model of a well-pipelinerisersystem is introduced and tted to a reference model in the ow ...