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8746468 
Meetings & Symposia 
A novel subsea on-line multiphase fluid sampling and analysis system 
Baker, A; Bjelland, C; Spilde, J; Frøysa, KE; Holstad, MB; Johansen, GA; Hjertaker, BT; Berntsen, B; Stavland, SH 
2007 
International Society for Industrial Process Tomography 
768-775 
English 
The trend in subsea petroleum production systems in offshore field developments points toward integrated production and processing facilities at the seabed along with more extensive use of multiphase transportation technology. The SOFA (Subsea On-line multiphase Fluid sampling and Analysis) system designed by Christian Michelsen Research is an autonomous metering station for permanent installation subsea where transfer of fluid samples to the surface by a remotely operated vehicle is avoided. The focus in this presentation will be on the first experimental results for fluid characterization with ultrasound and gamma-ray technology. A prototype for capturing multiphase fluid samples in a dedicated measurement chamber/sample container has been built. This is equipped with ultrasound sensors and a dual modality (DMD) gamma-ray system, which together with pressure and temperature measurements will be used as a multi-modality system for fluid characterisation. This system brings about several challenges. Firstly, to design a mechanism that ensures representative sampling of the gas/oil/water fluid into the measurement chamber and secondly, to perform the actual measurement after the fluid is separated and stabilized in the chamber. The first issue is being studied by CFD-modelling and experimental tests. © 2007, International Society for Industrial Process Tomography. All rights reserved. 
Gamma-ray measurement; Multiphase flow analysis; Ultrasound measurement