Evren Ozbayoglu - Faculty & Adjuncts

Evren Ozbayoglu, PhD

Evren Ozbayoglu, PhD
Executive Director of TUDRP
Wellspring Professor of Petroleum Engineering
College of Engineering & Natural Sciences
Petroleum Engineering
918-631-2972 Stephenson Hall Room 2265


PhD – The University of Tulsa MS – Middle East Technical University BS – Middle East Technical University


Evren M. Ozbayoglu is currently a “Chapman Endowed Wellspring 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 SPE Regional Drilling Engineer Award, 2019, “Outstanding Technical Editor Award” for SPE Journal, SPE Reservoir Application & Engineering, and SPE Drilling & Completion for years 2012, 2013, 2015, 2018, “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.

Research Interests

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

Teaching Interests

Drilling Engineering
Well Completions


Journal Articles

  • Baldino , S., S. Miska, M. Ozbayoglu, and J. Zhang. Borehole-Breathing/Kick Discriminator: Diagnostic Tool and Potential Resource for In-Situ Formation Characterization. SPE Drilling and Completion, 2019.
  • Tombul , H., M. Ozbayoglu, and M. Ozbayoglu. Computational Intelligence Models for PIV Based Particle (Cuttings) Direction and Velocity Estimation in Multi-Phase Flows. Vol. 172, Journal of Petroleum Science and Engineering, 2019, pp. 547-58.
  • Bbosa , B., M. Ozbayoglu, and M. Volk. Experimental Investigation of Hydrate Formation, Plugging and Flow Properties Using a High-Pressure Viscometer With Helical Impeller. Vol. 2, Journal of Petroleum Exploration and Production Technology, 2018, pp. 1089-04.
  • Ozbayoglu , M., O. Erge, and M. Ozbayoglu. Predicting the Pressure Losses While the Drillstring Is Buckled and Rotating Using Artificial Intelligence Methods. Vol. 56, [Window Title] BSvcProcessor [Main Instruction] BSvcProcessor has stopped working [Content] Windows is checking for a solution to the problem… [Cancel], 2018, pp. 72-80.
  • Equivalent Circulating Density Modeling of Yield Power Law Fluids Validated With CFD Approach. Vol. 140, Journal of Petroleum Science and Engineering, 2016, pp. 16–27.
  • Laminar to Turbulent Transition of Yield Power Law Fluids in Annuli. Vol. 128, Journal of Petroleum Science and Engineering, 2015, pp. 128–139.
  • 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.

  • Pressure Profile in Annulus: Solids Play a Significant Role. Vol. 137, Journal of Energy Resources Technology, 2015, p. 064502.
  • The Effects of Drillstring-Eccentricity,-Rotation, and-Buckling Configurations on Annular Frictional Pressure Losses While Circulating Yield-Power-Law Fluids. Vol. 30, SPE Drilling & Completion, 2015, pp. 257–271.
  • Buckling of Buoyancy-Assisted Tubulars. Vol. 29, SPE Drilling & Completion, 2014, pp. 372–385.
  • Effect of Drillstring Deflection and Rotary Speed on Annular Frictional Pressure Losses. Vol. 136, Journal of Energy Resources Technology, 2014, p. 042909.
  • Ozbayoglu , M., R. Ettehadi Osgouei, M. Ozbayoglu, and E. Yuksel. Hole-Cleaning Performance of Gasified Drilling Fluids in Horizontal Well Sections. Vol. 17, SPE Journal, 2012, pp. 912–923.
  • Sorgun , M., I. Aydin, M. Ozbayoglu, and J. Schubert. Mathematical Modeling of Turbulent Flows of Newtonian Fluids in a Concentric Annulus With Pipe Rotation. Vol. 34, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2012, pp. 540–548.
  • Sorgun , M., I. Aydin, and M. Ozbayoglu. Friction Factors for Hydraulic Calculations Considering Presence of Cuttings and Pipe Rotation in horizontal/Highly-Inclined Wellbores. Vol. 78, Journal of petroleum science and engineering, 2011, pp. 407–414.
  • Ozbayoglu , M., A. Saasen, M. Sorgun, and K. Svanes. Critical Fluid Velocities for Removing Cuttings Bed Inside Horizontal and Deviated Wells. Vol. 28, Petroleum Science and Technology, 2010, pp. 594–602.
  • Ozbayoglu , M., M. Sorgun, A. Saasen, and K. Svanes. Hole Cleaning Performance of Light-Weight Drilling Fluids During Horizontal Underbalanced Drilling. Vol. 49, Journal of Canadian Petroleum Technology, 2010, pp. 21–26.
  • Ozbayoglu , M., and M. Ozbayoglu. Estimating Flow Patterns and Frictional Pressure Losses of Two-Phase Fluids in Horizontal Wellbores Using Artificial Neural Networks. Vol. 27, Petroleum Science and Technology, 2009, pp. 135–149.
  • Ozbayoglu , M., S. Akin, and T. Eren. Image Processing Techniques in Foam Characterization. Vol. 29, Energy Sources, Part A, 2007, pp. 1175–1185.
  • Using Foam in Horizontal Well Drilling: A Cuttings Transport Modeling Approach. Vol. 46, Journal of Petroleum Science and Engineering, 2005, pp. 267–282.
  • A Comparative Study of Hydraulic Models for Foam Drilling. Vol. 41, Journal of Canadian Petroleum Technology, 2002.

Conference Proceedings

  • “On the Instability of Cement-Fluid Interface and Fluid Mixing”. SPE Deepwater Drilling and Completions Conference, 2016.
  • 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.

  • “Feasibility Study of Applying Intelligent Drill Pipe in Early Detection of Gas Influx During Conventional Drilling”. SPE/IADC Drilling Conference, 2013.
  • Eren , T., and M. Ozbayoglu. “Real Time Optimization of Drilling Parameters During Drilling Operations”. SPE Oil and Gas India Conference and Exhibition, 2010.

Courses Taught

  • Well Construction and Completion Design
  • Independent Study
  • Research and Dissertation
  • Research and Thesis
  • Well Complete Dsgn Quiz
  • Residency
  • Advanced Drilling

Professional Affiliations

  • American Society of Mechanical Engineers
  • Society of Petroleum Engineers

Awards & Honors

  • Outstanding Technical Editor Award
  • Regional Drilling Engineering
  • Chevron Fellowship
  • Regional Distinguished Faculty Award