Evren Ozbayoglu Ph.D.,M.S.

Wellspring Associate Professor of Petroleum Engineering College of Engineering & Natural Sciences
McDougall School of Petroleum Engineering
Stephenson Hall 2265 918-631-2972


Evren M. Ozbayoglu is currently a “Chapman Endowed Wellspring Associate Professor” of The University of Tulsa (TU), McDougall School of Petroleum Engineering, and the Director of The University of Tulsa, Drilling Research Projects (TUDRP). He has earned his BSc in 1996 and MSc in 1998 from METU. He earned his PhD degree from The University of Tulsa in 2002. He started working at METU as a full time faculty, and continued working at METU till 2009 August. Since then, he is working for TU. Dr. Ozbayoglu has numerous publications and participated in several industrial projects on major drilling engineering topics as well as wellbore hydraulics, hole cleaning, and tubular mechanics. He was awarded for “Outstanding Technical Editor Award” for SPE Journal, SPE Reservoir Application & Engineering, and SPE Drilling & Completion for years 2012, 2013, and 2015, “SPE Regional Distinguished Faculty Award – Mid-Continent Region – 2013” within 2012-2013 academic year. He is an SPE member since 1994, and ASME member since 2015.

Ph.D., The University of Tulsa
M.S., Middle East Technical University
B.S., Middle East Technical University

Drilling Engineering
Fluid and Solid Mechanics
Directional Horizontal Drilling
Cuttings Transport
Fluid Characterization

Drilling Engineering

The following may be selected publications rather than a comprehensive list.

Journal Articles

Erge, Oney et al. “Equivalent Circulating Density Modeling of Yield Power Law Fluids Validated with CFD Approach.” Journal of Petroleum Science and Engineering 140 (2016): 16–27. Print.

Erge, Oney et al. “Laminar to Turbulent Transition of Yield Power Law Fluids in Annuli.” Journal of Petroleum Science and Engineering 128 (2015): 128–139. Print.

Erge, Oney et al. “The Effects of Drillstring-Eccentricity,-Rotation, and-Buckling Configurations on Annular Frictional Pressure Losses While Circulating Yield-Power-Law Fluids.” SPE Drilling & Completion 30.03 (2015): 257–271. Print.

Osgouei, Reza et al. “Pressure Drop Estimation in Horizontal Annuli for Liquid–Gas 2 Phase Flow: Comparison of Mechanistic Models and Computational Intelligence Techniques.” Computers & Fluids 112 (2015): 108–115. Print.

Zhang, Feifei et al. “Pressure Profile in Annulus: Solids Play a Significant Role.” Journal of Energy Resources Technology 137.6 (2015): 064502. Print.

Erge, Oney et al. “Effect of Drillstring Deflection and Rotary Speed on Annular Frictional Pressure Losses.” Journal of Energy Resources Technology 136.4 (2014): 042909. Print.

Arslan, Mehmet et al. “Buckling of Buoyancy-Assisted Tubulars.” SPE Drilling & Completion 29.04 (2014): 372–385. Print.

Sorgun, M et al. “Mathematical Modeling of Turbulent Flows of Newtonian Fluids in a Concentric Annulus with Pipe Rotation.” Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 34.6 (2012): 540–548. Print.

Ozbayoglu, Mehmet et al. “Hole-Cleaning Performance of Gasified Drilling Fluids in Horizontal Well Sections.” SPE Journal 17.03 (2012): 912–923. Print.

Sorgun, Mehmet, Ismail Aydin, and Mehmet Ozbayoglu. “Friction Factors for Hydraulic Calculations Considering Presence of Cuttings and Pipe Rotation in Horizontal/Highly-Inclined Wellbores.” Journal of petroleum science and engineering 78.2 (2011): 407–414. Print.

Ozbayoglu, Mehmet et al. “Critical Fluid Velocities for Removing Cuttings Bed inside Horizontal and Deviated Wells.” Petroleum Science and Technology 28.6 (2010): 594–602. Print.

Ozbayoglu, Mehmet et al. “Hole Cleaning Performance of Light-Weight Drilling Fluids during Horizontal Underbalanced Drilling.” Journal of Canadian Petroleum Technology 49.04 (2010): 21–26. Print.

Ozbayoglu, Mehmet, and MA Ozbayoglu. “Estimating Flow Patterns and Frictional Pressure Losses of Two-Phase Fluids in Horizontal Wellbores Using Artificial Neural Networks.” Petroleum Science and Technology 27.2 (2009): 135–149. Print.

Ozbayoglu, Mehmet, S Akin, and T Eren. “Image Processing Techniques in Foam Characterization.” Energy Sources, Part A 29.13 (2007): 1175–1185. Print.

Ozbayoglu, Mehmet et al. “Using Foam in Horizontal Well Drilling: A Cuttings Transport Modeling Approach.” Journal of Petroleum Science and Engineering 46.4 (2005): 267–282. Print.

Ozbayoglu, Mehmet et al. “A Comparative Study of Hydraulic Models for Foam Drilling.” Journal of Canadian Petroleum Technology 41.06 (2002): n. pag. Print.

Conference Proceedings

Karbasforoushan, Hanieh et al. “On the Instability of Cement-Fluid Interface and Fluid Mixing.” SPE Deepwater Drilling and Completions Conference. 2016. Print.

Karimi Vajargah, A et al. “Feasibility Study of Applying Intelligent Drill Pipe in Early Detection of Gas Influx during Conventional Drilling.” SPE/IADC Drilling Conference. 2013. Print.

Eren, Tuna, Mehmet Ozbayoglu, and others. “Real Time Optimization of Drilling Parameters during Drilling Operations.” SPE Oil and Gas India Conference and Exhibition. 2010. Print.

PE 3043 Drilling Engineering I
PE 4043 Drilling Engineering II
PE 4063 Well Construction and Completion Design
PE 4863 Special Topics in Petroleum Engineering
PE 7123 Advanced Drilling Fluids
PE 7913 Master's Project
PE 7983 Research and Thesis