1 / 24

Influence of Sensor Degradation on Flowrate Estimates by Virtual Flow Metering Systems

Analysis on the impact of sensor degradation and failure on flow rate estimates in virtual flow metering systems. Study includes heat transfer modeling, simulations, and sensitivity analysis. Results show segmented approach effectiveness based on known variables.

lonaj
Download Presentation

Influence of Sensor Degradation on Flowrate Estimates by Virtual Flow Metering Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related