Marcelo Souza de Castro Israel F dos Santos Almeida
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1 Engineering School of São Carlos EESC - USP PROSPECTIVE STUDY OF A DOUBLE-SENSOR CAPACITIVE PROBE FOR THE MEASUREMENT OF IN-SITU VOLUMETRIC FRACTION IN OIL, WATER AND AIR FLOWS Marcelo Souza de Castro Israel F dos Santos Almeida Prof. Dr. Oscar M. H. Rodriguez.
2 2 Outline Introduction; Setup; Results; Static calibration; Dynamic measurements; Dynamic measurements of volumetric fraction in slug flow; Three-phase conditions; Conclusion. References
3 Introduction Measurement of in-situ volumetric fraction with: Low operational cost; Reliable response. Non-intrusive techniques; Capacitive sensors; Gas-liquid, liquid-liquid flows; Gas-liquid-liquid flow. 3
4 4 Setup Test line for dynamic tests.
5 5 Setup Capacitive sensors. Configurations of the sensors: parallel plates, rings and helix.
6 Setup Transducer Circuit. Transducer circuit with bridge of capacitors and sources of tension designed and assembled at NETeF. 6
7 Results Static calibration. i Setup p #1 7
8 Results Static calibration Sensor Helix sensor de Hélices nº 2n 0 2 α ω =2,577+0,282 C-0,003 C 2 +1,828E-5 C 3 80 Water Fração Fraction de Água (%) (% %) Water fraction as a function of capacitive reading 12 Capacitance Capacitância (F x ) 8
9 9 Results Dynamic measurement Setup #2
10 10 Results Dynamic measurement Static X Dynamic data (H2) Water frac ction (%) 1.0 Static calibration curve Stratified Flow Annular Flow Bubbles Flow Regression Regretion curve of static points of static points Tension (volts)
11 11 Results Dynamic measurements of volumetric fraction in slug flow. 3,0x10-11 Sinal Slug Pistonado Flow Signal 2,5x10-11 Capacita Capacitâ ance ância (F) 2,0x ,5x ,0x ,0x , Tempo Acquisition de iti Aquisição Time i (ms) (ms)
12 Results Dynamic measurements of volumetric fraction in slug flow Rings Sensor (A2) 90 Quick-Closing-Valves Technique Proble Water frac ction (%) Tension (Volts) 12
13 13 Results Static measurement in three-phase condition. A B C a V w an D E F. a = V o he aa 1 System of equations.
14 14 Results Static measurement in three-phase condition. Water Fraction (%) Air Fraction (%) Oil Fraction (%) Rings sensor capacitance (pf) Helix sensor capacitance (pf) , , , , , , , , , ,52667 Fluid fractions in the static three-phase tests.
15 15 Results Static measurement in three-phase condition. 9, , ,34533 a C w an 9, , , a = C o he a 1 a Final model.
16 Conclusion Usage of double-helix and rings sensors geometries; Flow pattern dependent method; Model for volumetric fraction measurement in three-phase h flow. 16
17 17 References Almeida, I. F. S. ; Castro, M. S. ; Rrodriguez, O. M. H.. Non-intrusive Capacitive Probe For Measurement of In-situ Volumetric Fraction in Water-oil and Water-air Flows. In: 18th International Congress of Mechanical Engineering - COBEM-2005, 2005, Ouro Preto. Proceedings of the COBEM 2005, Almeida, I. F.S. (2006), Prospective Study of a Non-intrusive i Double-sensor Capacitive Probe for Insitu Volumetric Fraction Measurements in Oil-water-air Flows, 2006, 162 p. Dissertation Master s Degree, Escola de Engenharia de São Carlos, Universidade de São Paulo, São Paulo, Baxter, L.K. (1997), Capacitive sensors: design and applications. New York: IEEE. Chun, M.H. and Sung, C.K. (1986). Parametric effects on the void measurement by capacitance transducer. International Journal of Multiphase Flow, Oxford, v.12, n.4, p , July/Aug. Hammer, E.A.; Tollefsen, J. and Olsvik, K. (1989). Capacitance transducers for non-intrusive measurement of water in crude oil. Flow Measurement and Instrumentation, New York, v.1, n.1, p.51-58, Oct. Huang, S.M. et al. (1988). Electronic transducer for industrial i measurement of low value capacitances. Journal of Physics E - scientific instruments, Bristol, v.21, n.3, p , Mar. Reis, E. (2003), Study of pressure drop and phases distribution of the horizontal air water slug flow in pipelines with T branch arms. Ph.D.Thesis University of Campinas, Campinas, Reis, E. and Goldstein, L. (2005), A procedure for correcting for the effect of fluid flow temperature variation on the response of capacitive void fraction meters. Flow Measurement and Instrumentation, New York, v.16, n.4, p , Aug. Tollefsen, J. and Hammer, E.A. (1998), Capacitance sensor design for reducing errors in phase concentration measurements. Flow Measurement and Instrumentation, New York, v.9, n.1, p.25-32, Mar.
18 Acknowledgement FAPESP CNPq
19 Contact!
20 Thanks for the attention! Questions?
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