Research interests

• Nanotechnology for oil and gas applications.
• Drilling fluids/non-damaging fluid technologies.
• Rheology of complex fluids / non-Newtonian fluids.
• Formation damage and wellbore stability.
• High Temperature/High Pressure (HT/HP) Applications.
• Interfacial phenomena in complex fluids systems.

Selected publications

Journal papers:

1. Vryzas. Z., Kelessidis. V. C., Nalbantian. L., Zaspalis. V. How Different Nanoparticles Affect the Rheological Properties of Aqueous Wyoming Sodium Bentonite Suspensions, J. Petrol. Sci. Eng., 2018, 173, 941-954.
2. Mahmoud. O., Vryzas. Z., Kelessidis. V. C., Nasr-El-Din. H. Using Ferric Oxide and Silica Nanoparticles to Develop Modified Bentonite Fluids for HP/HT Drilling Applications, SPE Drill. Completion. 2018, 33 (1), 1-15 (https://doi.org/10.2118/178949-PA).
3. Vryzas. Z., Kelessidis. V. C. Nano-based Drilling Fluids: A Review, Energies. 2017, 10(4), 540 (http://www.mdpi.com/1996-1073/10/4/540). 
4. Vryzas. Z., Kelessidis. V. C., Nalbantian. L., Zaspalis. V., Gerogiorgis. D. I.,Wubulikasimu. Y. Effect of Temperature on the Rheological Properties of Neat Aqueous Sodium Bentonite Suspensions, Appl. Clay Sci. 2017, 136, 26-36 (https://doi.org/10.1016/j.clay.2016.11.007).
5. Vryzas. Z., Mahmoud. O., Nasr-El-Din. H., Kelessidis. V. C. New Magnetite Nanoparticles Allow Smart Drilling Fluids with Superior Properties, J. Petrol. Tech. 2017, 69, 41-42 (https://doi.org/10.2118/1117-0041-JPT) (featured article).
6. Vryzas. Z., Mahmoud. O., Nasr-El-Din. H., Kelessidis. V. C. Development of Novel Drilling-Fluid Nanoparticles for Enhanced Drilling Operations, J. Petrol. Tech. 2016, 68, 48-50 (https://doi.org/10.2118/1116-0048-JPT) (featured article).
7. Reilly. S. I., Vryzas. Z., Kelessidis. V. C., Gerogiorgis. D. I., (2016): First-Principles Rheological Modelling and Parameter Estimation for Nanoparticle-Based Smart Drilling Fluids, Computer-Aided Chem. Eng., 38, 1039–1044.

Conference papers:

1. Vryzas. Z., Matenoglou. G., Kelessidis. V. C., (2017): Assessment of Formation Damage Potential of Novel Drilling Fluids via Integration of Fluid Loss Data With Filter Cake Quality and Filtrate Core Penetration Depth from NMR and MRI, SPE-188544-MS, Abu Dhabi International Petroleum Exhibition and Conference (ADIPEC), 13-16 November 2017, Abu Dhabi, UAE.
2. Gerogiorgis. D. I., Reilly. S. I., Vryzas. Z., Kelessidis. V. C., (2017): Experimentally Validated First-Principles Multivariate Modelling for Rheological Study and Design of Complex Drilling Nanofluid Systems, SPE-184692-MS, SPE/IADC Drilling Conference and Exhibition (SPE/IADC), 14-16 March 2017, The Hague, The Netherlands.
3. Vryzas. Z., Mahmoud. O., Nasr-El-Din. H., Zaspalis. V., Nalbantian. L., Antoniou. M., Gournis. D., Bowman. M., Kelessidis. V. C., (2017): Smart Magnetic Drilling Fluids with In-situ Rheological Controllability Using Fe₃O₄ Nanoparticles, SPE-183906-MS, 20th Middle East Oil & Gas Show and Conference (MEOS), 6-9 March 2017, Manama, Bahrain.

Academic degrees

Ph.D., Chemical/Petroleum Engineering, Aristotle University of Thessaloniki, Greece, 2018
DBA, Business Administration, Paris School of Business, France, 2015
MSc, Petroleum Engineering, Heriot Watt University, UK, 2012
BSc/MSc, Environmental Engineering, Technical University of Crete, Greece, 2010

Membership

Society of Petroleum Engineers (SPE), European Association of Geoscientists and Engineers (EAGE)