Cockrell School of Engineering
The University of Texas at Austin

Ryosuke Okuno

Photo of Okuno, Ryosuke

Associate Professor

Pioneer Corporation Faculty Fellow in Petroleum Engineering

Phone: (512) 471-3250
Office: CPE 5.118B

Personal Website:

Research Areas: Phase Behavior; Thermodynamics; Enhanced Oil Recovery; Heavy Oil Recovery, Reservoir Simulator Development; Unconventional Resources

Educational Qualifications:

Ph.D., Petroleum Engineering, University of Texas at Austin, 2009

M.E., Geosystem Engineering, University of Tokyo, 2000

B.E., Geosystem Engineering, University of Tokyo, 1998

PGE Courses:

PGE 427 (Properties of Petroleum Fluids)

PGE 384 (Advanced Thermodynamics and Phase Behavior)


Before joining the UT PGE faculty in August 2015, I served as an assistant professor of petroleum engineering at the University of Alberta. I also have seven years of industrial experience as a reservoir engineer, and am a registered Professional Engineer in Alberta, Canada. My research and teaching interests include enhanced oil recovery, heavy oil recovery, unconventional oil and gas resources, numerical reservoir simulation, thermodynamics, multiphase behavior, and applied mathematics.

Awards & Honors:

Technical Editor Award, SPE Journal, SPE, 2017. 

Technical Editor Award, SPE Reservoir Evaluation & Engineering, SPE, 2015, 2016, 2017. 

Excellence in Peer Review, Journal of Natural Gas Science & Engineering, Elsevier, 2014.

SPE Petroleum Engineering Junior Faculty Research Initiation Award, 2012.

Associate Editor for SPE Journal.

Highlighted Publications and Google Scholar Profiles:

Jia, W. and Okuno, R., Modeling of Asphaltene and Water Associations in Petroleum Reservoir Fluids Using Cubic-Plus-Association EOS, AIChE Journal, Volume 64, Issue 9, pp. 3429 – 3442, September 2018.

Sheng, K., Okuno, R., and Wang, M., Dimethyl Ether as an Additive to Steam for Improved Steam-Assisted Gravity Drainage, SPE Journal, Volume 23, Issue 4, August 2018. 

Neshat, S., Okuno, R., and Pope, G.A., A Rigorous Solution to the Problem of Phase Behavior in Unconventional Formations with High Capillary Pressure, SPE Journal, Volume 23, Issue 4, August, 2018.

Zhu, D., Eghbali, S., Shekhar, C., and Okuno, R., A Unified Algorithm for Phase-Stability/Split Calculation for Multiphase PT Flash, SPE Journal, Volume 23 Issue 2, pp. 498 – 521, April 2018.

Shi, X. and Okuno, R. Analytical Solution for Steam-Assisted Gravity Drainage with Consideration of Temperature Variation along the Edge of a Steam Chamber, Fuel, Volume 217, pp. 262-274, April 1, 2018.

Kumar, A. and Okuno, R., A New Algorithm for Multiphase Fluid Characterization for Solvent Injection, SPE Journal, Volume 21, Issue 5, October 2016.

Keshavarz, M., Okuno, R., and Babadagli, T., Optimal Application Conditions for Steam-Solvent Coinjection, SPE Reservoir Evaluation & Engineering, Volume 18, Number 1, pp. 20-38, February 2015.

Okuno, R. and Xu, Z., Mass Transfer on Multiphase Transitions in Low-Temperature Carbon-Dioxide Floods, SPE Journal, Volume 19, Number 6, pp. 1005-1023, December 2014.

Kumar, A. and Okuno, R., Critical Parameters Optimized for Accurate Phase Behavior Modeling for Heavy n-Alkanes up to C100 using the Peng-Robinson Equation of State, Fluid Phase Equilibria, Volume 335, pp. 46-59, December 15, 2012.

Okuno, R., Johns, R.T., and Sepehrnoori, K., A New Algorithm for Rachford-Rice for Multiphase Compositional Simulation, SPE Journal, Volume 15, Number 2, pp. 313-325, June 2010.