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PhD candidate: Timur Bikmukhametov Supervisor: Associate Professor Johannes Jäschke

SUBPRO SUBSEA PRODUCTION AND PROCESSING. Analysis of Influence of Sensor Degradation on Flowrate Estimates by Virtual Flow Metering Systems. PhD candidate: Timur Bikmukhametov Supervisor: Associate Professor Johannes Jäschke. Virtual Flow Metering system. Mass conservation

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PhD candidate: Timur Bikmukhametov Supervisor: Associate Professor Johannes Jäschke

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  1. SUBPROSUBSEA PRODUCTION AND PROCESSING Analysis of Influence of Sensor Degradation on Flowrate Estimates by Virtual Flow Metering Systems PhD candidate: Timur Bikmukhametov Supervisor: Associate Professor Johannes Jäschke

  2. Virtual Flow Metering system Mass conservation Momentum equation Energy equation

  3. Topics • Influence of sensor degradation • Heat transfer modelling It does! Simple doesn’t mean bad

  4. Pressure/temperature sensor degradation • ± 0.1 % uncertainty • ± 0.5 % uncertainty • ± 1 % uncertainty

  5. VFM software

  6. Simulation setup Pwh_meas= 0.99·Pwh... 1.01·Pwh Twh_meas= 0.99·Twh... 1.01·Twh Twh, Pwh 1 % uncertainty Monte Carlo Simulations 98% confidence 40 - 130 simulations per case Optimizer 1 % uncertainty Twf, Pwf Pwf_meas = 0.99·Pwf ... 1.01·Pwf Twf_meas= 0.99·Twf... 1.01·Twf

  7. System

  8. Pressure/temperature sensor degradation

  9. Pressure/temperature sensor degradation

  10. Temperature sensor failure

  11. Study 2 Temperature sensor failure • True Twfdoes not change • True Twf changes • +5% drop • - 5% drop

  12. Temperature sensor failure, Twfdoes not change

  13. Temperature sensor failure, Twfchanges 160 105

  14. Heat transfer modeling

  15. Heat transfer modeling Total (unique) U-value method Multiple U-value method Twh U1 U2 U total U3 U4 U5 Twf

  16. + + +

  17. Well structure 57 ⁰C 70 ⁰C

  18. Temperature profile

  19. Sensitivity study T = 57; …; …; … ⁰C m = 35 + 2; 4; 6 … kg/s

  20. Conclusions • Sensor degradation has an impact on flowrate estimates • Failure of temperature sensors makes estimates less accurate • Segmented approach does not give an advantage if Twh is known • Segmented approach might be better if Twh is unknown or T is measured along the wellbore

  21. Further work • Perform the analysis for different GOR values and a gas well • Identify the most critical points in the system

  22. Order of magnitude analysis

  23. Matching the wellhead temperature = 20 21 2 31.5 33 = 30 Uunique= 24

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