Evren Ozbayoglu, PhD

Evren Ozbayoglu, PhD
Executive Director of TUDRP
Wellspring Associate 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 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.

Research Interests

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

Teaching Interests

Drilling Engineering


Journal Articles

  • 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.
  • “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

  • Research and Dissertation
  • Special Topics in Petroleum Engineering
  • Independent Study
  • Research and Thesis
  • Well Complete Dsgn Quiz
  • Well Construction and Completion Design

Professional Affiliations

  • American Society of Mechanical Engineers
  • Society of Petroleum Engineers

Awards & Honors

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