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As a professor of Drilling Engineering, he has taught Drilling Engineering and Advanced Drilling Engineering to TAMUQ and TUC students as well as gave industry professional short courses on Drilling and Completion subjects in Doha, in London and in the MENA region. Prior to this, Professor Kelessidis has worked for over 9 years with different Schlumberger companies in Houston, France and England, working on drilling fluid issues, surface logging, kick control, cementing operations and drilling hydraulics. During the span of his 30 year career in the upstream Oil & Gas Industry he has taught and performed research on, Drilling Engineering, Advanced Drilling Engineering, Drilling Fluids, Drilling and Completion, Drilling Hydraulics, Cementing, and Introduction to Oil & Gas. He is a NEXT & MOGL Mobility Oil & Gas UK, Instructor on, Drilling Engineering, Drilling Fluids, Advanced Deep Water Drilling, Petroleum Engineering for non-Engineers. Prof. Kelessidis has established at Texas A&M at Qatar and at TUC a Drilling Hydraulics, Drilling Fluid, Cementing and Drilling Engineering laboratory which aimed to excel in research & education on drilling engineering, drilling optimization, fluid mechanics and multiphase flows, cuttings transport capacity of drilling fluids, on drilling fluid development and drilling fluid rheology, on formation damage by drilling fluids, on optimization of drilling process studying rock-bit interaction, and on elastic and self-healing cement formulation. His research activities were extended to rock typing and understanding rock petrophysical properties and interaction of rock surfaces with formation fluids and mud filtrates. He works with the recently commercialized drilling predictive simulator, PAYZONE, a PC based simulator (https://modus.global/services-products/payzone/), which is a predictive tool to optimize the drilling process regarding Weight on Bit, Torque and Rotational Speed and bit condition, using field data. This is achieved by adjusting the simulator and thus allowing optimization of the drilling process in future drilling campaigns in similar areas. The simulator is built around a drilling mechanics model that predicts the rate of penetration and rate of wear of a drill bit as a function of the bit, the rock being drilled and the set of operating parameters. SPE 172793 paper “An Improved Drilling Simulator for Operations, Research and Training” was presented at MEOS 2015; while SPE 156348 paper “Optimization of Casing Drilling Performance Using PAYZONE Simulator and Historical Well Data” addresses simulation of Casing Drilling data. Dr. Kelessidis has over 80 publications in refereed journals and conferences, and more than 1000 citations with an h-index of 18. He is the co-author of Chapter 5 - Drilling Hydraulics, in ‘Fundamentals of Drilling Engineering’ edited by: R.F. Mitchell and S.Z. Miska in 2011, in the SPE Textbook Series. He will serve as Associate Editor in SPE Drilling and Completion Journal, starting October 2016. He has a PhD from University of Houston, a M.Sc. from Oregon State University and a Diploma from Aristotelian University of Thessaloniki Greece, all in Chemical Engineering.
Non-Newtonian rheology, Rheology of suspensions, Drilling fluids, Rheological measurements, Standards development, Non-Newtonian fluid flows, Multiphase flows
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