About Me
George Zabaras has been an independent Oil & Gas Upstream consultant after 33 years in Shell where he worked in various roles including Production Technology, Process Engineering, Flow Assurance and Deepwater Systems. His most recent work was for Heavy Oil Developments in North Kuwait and Deepwater Projects such as Vito and Appomattox in the Gulf of Mexico.
My CV
U.S. Patents
8,857,457. Systems and methods for producing and transporting viscous crudes
8,322,430. Pipes, systems, and methods for transporting fluids
7,918,283. Method and apparatus for a cold flow subsea hydrocarbon production system
7,771,522. Separator for multi-phase slug flow and method of designing same
7,540,902. Separator for multi-phase slug flow and method of designing same
7,530,398. Method and apparatus for a cold flow subsea hydrocarbon production system
5,159,977. Electrical submersible pump for lifting heavy oils
Select Publications
1. A.E. Dukler-A Legacy of Contributions to Chemical Engineering, Chem. Eng. Comm. (1996), Vols.141-142, pp.3-11 (with M. Wicks, III and F. K. Wasden).
2. Physical Modeling of Vertical Multiphase Flow: Prediction of Pressure Gradients in Oil and Gas Wells, OTC 7515, presented at the 1994 Offshore Technology Conference, Houston, TX.
3. New System for Lifting Viscous Crudes Utilizing ESP�s (1992), Society of Petroleum Engineers, 1992 Electric Submersible Pump Workshop, April 29-May 1, 1992 (with S. Hirshblond).
4. Countercurrent Gas-Liquid Annular Flow, including the Flooding State (1988), AIChE J., Vol.34, p.389 (with A. E. Dukler).
5. Interfacial Structure of Thin Falling Films: piecewise modeling of the waves with counter shear (1987), Chem. Eng. Comm., Vol.58, p.245 (with Brauner, N., Moalem-Maron, D. and A. E. Dukler).
6. Vertical Upward Cocurrent Gas-Liquid Annular Flow (1986), AIChE J., Vol.35, p.829 (with Moalem-Maron,D. and Dukler A. E.)
7. Studies of Vertical Annular Gas-Liquid Flows (1985), Ph.D. Dissertation, University of Houston, Houston, TX.
8. Oxygen Absorption in Oil-in-Water Emulsions (1980), Thesis in Chem. Eng., National Technical University of Athens.
9. Steady-State and Transient Thermal Performance of Subsea Hardware, OTC 8544, presented at the 1997 Offshore Technology Conference, 5-8 May 1997, Houston, TX (with J. Zhang).
10. Steady-state and Transient Thermal Performance of Subsea Hardware, SPE Drilling and Completion, June 1998 (with J. Zhang).
11. Bundle-Flowline Thermal Analysis, (1998), December 1998, Journal of Petroleum Technology
12. Prediction of Slug Frequency for Gas/Liquid Flows (2000), SPE Journal, September 2000.
13. Multiphase Liquid-Liquid-Gas Flow in Horizontal and Inclined Pipes (2001), presented at the 2001 International Multiphase Flow Conference held in New Orleans on May 27-June 1, 2001.
14. Effectiveness of Bullheading Operations for Hydrate Management in DVA and Subsea Wells (2004), presented at the 2004 Offshore Technology Conference, paper 16689 (with A. Mehta).
15. Unlocking Deepwater Heavy Oil Reserves-A Flow Assurance Perspective (2004), presented at the 2004 Offshore Technology Conference, paper 16682 (with A. Mehta).
16. The Use of Subsea Gas Lift in Deepwater Applications (2007),(with Subash S. Jayawardena and Leonid A. Dykhno), Shell Global Solutions, prepared for the 2007 Offshore Technology Conference, paper OTC 18820, Houston, April 30-May 3, 2007.
17. Large-Diameter-Riser Laboratory Gas Lift Tests (with W. Schoppa, R. Menon and M. Wicks) Paper OTC 23968, prepared for the 2013 Offshore Technology Conference, Houston.
18. Flow Assurance in Oil Systems: On the Role and Impact of Naphthenic Acids (2012), SPE Conference Paper 157295-MS (with Andrew Shepherd et al).
19. Optimizing Operational Performance of Riser Systems Through Improved Understanding of Riser Thermal Behaviour (with Suranjan Sarkar et al.) 17185-MS IPTC Conference Paper � 2013.
20. The Use of Subsea Gas-Lift in Deepwater Applications (with Subash Jayawardena et al), 18820-MS OTC Conference paper � 2007.