Vassilios Kelessidis
Vassilios Kelessidis
Consultant, Drilling & Petroleum Engineering
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Optimal determination of rheological parameters for Herschel–Bulkley drilling fluids and impact on pressure drop, velocity profiles and penetration rates during drilling
VC Kelessidis, R Maglione, C Tsamantaki, Y Aspirtakis
Journal of Petroleum Science and Engineering 53 (3-4), 203-224, 2006
Modeling flow pattern transitions for upward gas-liquid flow in vertical concentric and eccentric annuli
VC Kelessidis, AE Dukler
International journal of multiphase flow 15 (2), 173-191, 1989
Experimental study and predictions of pressure losses of fluids modeled as Herschel–Bulkley in concentric and eccentric annuli in laminar, transitional and turbulent flows
VC Kelessidis, P Dalamarinis, R Maglione
Journal of Petroleum Science and Engineering 77 (3-4), 305-312, 2011
Effect of pH and electrolyte on the rheology of aqueous Wyoming bentonite dispersions
VC Kelessidis, C Tsamantaki, P Dalamarinis
Applied Clay Science 38 (1-2), 86-96, 2007
Flow patterns and minimum suspension velocity for efficient cuttings transport in horizontal and deviated wells in coiled-tubing drilling
VC Kelessidis, GE Bandelis
SPE Drilling & Completion 19 (04), 213-227, 2004
Nanoparticle-based drilling fluids for minimizing formation damage in HP/HT applications
O Mahmoud, HA Nasr-El-Din, Z Vryzas, VC Kelessidis
SPE international conference and exhibition on formation damage control, 2016
Nano-based drilling fluids: A review
Z Vryzas, VC Kelessidis
Energies 10 (4), 540, 2017
Yield stress of water–bentonite dispersions
VC Kelessidis, R Maglione
Colloids and Surfaces A: Physicochemical and Engineering Aspects 318 (1-3 …, 2008
Modeling rheological behavior of bentonite suspensions as Casson and Robertson–Stiff fluids using Newtonian and true shear rates in Couette viscometry
VC Kelessidis, R Maglione
Powder technology 168 (3), 134-147, 2006
Laminar, transitional and turbulent flow of Herschel–Bulkley fluids in concentric annulus
K Founargiotakis, VC Kelessidis, R Maglione
The canadian journal of chemical engineering 86 (4), 676-683, 2008
Development and Testing of Novel Drilling Fluids Using Fe2O3 and SiO2 Nanoparticles for Enhanced Drilling Operations
Z Vryzas, O Mahmoud, HA Nasr-El-Din, VC Kelessidis
International petroleum technology conference, 2015
Greek lignites as additives for controlling filtration properties of water–bentonite suspensions at high temperatures
VC Kelessidis, C Tsamantaki, A Michalakis, GE Christidis, P Makri, ...
Fuel 86 (7-8), 1112-1121, 2007
Use of Carbopol 980 and carboxymethyl cellulose polymers as rheology modifiers of sodium-bentonite water dispersions
VC Kelessidis, E Poulakakis, V Chatzistamou
Applied clay science 54 (1), 63-69, 2011
Measurement system and method for quantitatively determining the concentrations of a plurality of gases in drilling mud
E Tannenbaum, T Burgess, V Kalessidis, A Orban, J Williams, K Zanker
US Patent 4,887,464, 1989
Measurements and prediction of terminal velocity of solid spheres falling through stagnant pseudoplastic liquids
VC Kelessidis, G Mpandelis
Powder Technology 147 (1-3), 117-125, 2004
An explicit equation for the terminal velocity of solid spheres falling in pseudoplastic liquids
VC Kelessidis
Chemical engineering science 59 (21), 4437-4447, 2004
Real-time decision-making for value creation while drilling
L Saputelli, M Economides, M Nikolaou, V Kelessidis
SPE/IADC Middle East Drilling Technology Conference and Exhibition, 2003
Effect of temperature on the rheological properties of neat aqueous Wyoming sodium bentonite dispersions
Z Vryzas, VC Kelessidis, L Nalbantian, V Zaspalis, DI Gerogiorgis, ...
Applied Clay Science 136, 26-36, 2017
Gelation of water–bentonite suspensions at high temperatures and rheological control with lignite addition
VC Kelessidis, G Christidis, P Makri, V Hadjistamou, C Tsamantaki, ...
Applied clay science 36 (4), 221-231, 2007
Motion of large gas bubbles through liquids in vertical concentric and eccentric annuli
VC Kelessidis, AE Dukler
International journal of multiphase flow 16 (3), 375-390, 1990
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