NE Seminars

Thursday, September 15, 2005

• Geir Anton Johansen, Professor
  Department of Physics and Technology
  University of Bergen
  
• ''Multiphase Flow Measurement and Imaging"
• Abstract:
  
  Optimal utilization of the oil and gas reserves in the North Sea requires cutting edge technology including sea-bed and even down-hole processing facilities. Multiphase gas/oil/water flow measurement systems play an important role in the control of these facilities, in real-time well testing and control, and for allocation purposes. Most of these applications require in-line measurements without separation. The solution to this is the combination of several independent measurement principles yielding flow rates and volumetric component fractions from which the volumetric flow rates of each component are calculated. In addition to error propagation from multiple measurements, the main challenges are errors due to rapid flow regime fluctuations and variations in the flow component composition over the well life. To overcome these obstacles bulk measurements are being replaced with multiple measurements for each sensing principle. Further, additional measurement modalities are introduced to compensate, for instance, for variations in the water salinity. The measurement functions are normally semi-empirical models based on CFD and experiments in flow rigs with k flow references. One of these references is high speed flow imaging systems which provide the liquid/ gas distribution at the measurement cross section as function of time. In this seminar the research on multiphase flow measurement and imaging at the University of Bergen and Christian Michelsen Research will be presented. There will be a particular focus on challenges posed by flow regime and composition effects, and how nuclear methods can contribute to solve these problems.
  
  

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