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TECHNICAL PAPERS

Slug Detection as a Tool for Predictive Control of GLCC© Compact Separators

[+] Author and Article Information
Shankar Earni, Shoubo Wang, Ram S. Mohan, Ovadia Shoham

Mechanical and Petroleum Engineering Departments, The University of Tulsa, Tulsa, OK 74104

Jack D. Marrelli

ChevronTexaco, E&P Technology Division, Humble, TX 77338

J. Energy Resour. Technol 125(2), 145-153 (Jun 04, 2003) (9 pages) doi:10.1115/1.1521711 History: Received March 01, 2001; Revised July 01, 2002; Online June 04, 2003
Copyright © 2003 by ASME
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References

Marrelli, J. D., Tallet, M., Yocum, B., Dunbar, D., Mohan, R. S., and Shoham, O., 2000, “Methods for Optimal Matching of Separation and Metering Facilities for Performance, Cost, and Size: Practical Examples from Duri Area 10 Expansion” ETCE00-ER-10165, proceedings of the ETCE 2000 Conference of ASME Petroleum Division of ASME Petroleum Division, February 14–17, 2000.
Andreussi,  P., Bendiksen,  K. H., and Nydal,  O. J., 1993, “Void Distribution in Slug Flow,” Int. J. Multiphase Flow, 19(5), pp. 817–828.
Dhulesia, H., Bernicot, M., and Romanet, T., 1995, “Field Installation of an Acoustic Slug-Detection System,” presented at the SPE Annual Technical Conference and Exhibition, Dallas, October 22–25, pp. 285–291.
Barnea,  D., Shoham,  O., Taitel,  Y., and Dukler,  A. E., 1980, “Flow Pattern Characterization for Two-Phase Flow by Electrical Conductance Probe,” Int. J. Multiphase Flow, 6, pp. 387–397.
Wang, S., 1997, “Control System Analysis of Gas-Liquid Cylindrical Cyclone Separators,” M.S. thesis, The University of Tulsa.
Mohan,  R., Wang,  S., Shoham,  O., and Kouba,  G., 1998, “Design and Performance of Passive Control System for Gas-Liquid Cylindrical Cyclone Separators,” ASME J. Energy Resour. Technol., 120(1), pp. 49–55.
Wang,  S., Mohan,  R. S., Shoham,  O., Marrelli,  J. D., and Kouba,  G. E., 2000, “Performance Improvement of Gas Liquid Cylindrical Cyclone Separators Using Integrated Liquid Level and Pressure Control Systems,” ASME J. Energy Resour. Technol., 122, pp. 185–192.
Wang,  S., Mohan,  R., Shoham,  O., Marrelli,  J., and Kouba,  G., 2000, “Control System Simulators for Gas-Liquid Cylindrical Cyclone Separators,” ASME J. Energy Resour. Technol., 122, pp. 177–184.
Wang, S., 2000, “Dynamic Simulation, Experimental Investigation and Control System Design of Gas-Liquid Cylindrical Cyclone Separators,” Ph.D. dissertation, The University of Tulsa.
Payne, R. L., Huff, R. E., and Ogren, W. E. 1996, “Slug Flow Mitigation Control System and Method,” U.S. Patent 5544672.
Earni, B. S., 2001, “Predictive Control of Gas-Liquid Cylindrical Cyclone (GLCC) Separators,” M.S. thesis, The University of Tulsa.
Stephanopoulos, G., 1984, “Chemical Process Control,” PTR Prentice Hall International Series in the Physical and Chemical Engineering Sciences.
Taitel, Y., and Barnea, D., 1990, “Two-phase Slug Flow,” Academic Press, Inc.
Norman S. Nise, 2000, “Control System Engineering,” 3rd Edition Benjamin/Cummings Publishing Company, Inc.

Figures

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Schematic of GLCC control systems
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Integrated feed forward and feedback level control loop
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Closed loop magnitude plot for different compensator zero locations
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Liquid level control simulator (Matlab-Simulink) with both feedback and feedforward control loops
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Liquid level/liquid inflow-outflow response for a unit slug input (Vs=11 ft/s, L=22 ft) P=0.08, D=0.03
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Schematic of the slug detection zone with two conductances probes (C1, C2)
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a-System response for feedback control system (Vsg=3.84 ft/s, Vsl=0.38 ft/s, slug length=12 ft) b-System response for the integrated feed forward and feedback control systems (Vsg=3.84 ft/s, Vsl=0.38 ft/s, slug length=12 ft)
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a-System response for feedback control system (Vsg=6.61 ft/s, Vsl=0.41 ft/s, slug length=25 ft) b-System response for integrated feed forward and feedback control system (Vsg=6.61 ft/s, Vsl=0.41 ft/s, slug length=25 ft)

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