Cockrell School of Engineering
The University of Texas at Austin

Ryosuke Okuno

Photo of Okuno, Ryosuke

Assistant Professor

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

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, numerical reservoir simulation, thermodynamics, multiphase behavior, and applied mathematics. The current research topics in my group include numerical simulation, analytical solution, and experimentation for solvent injection, steam injection, and steam/solvent co-injection.

Awards & Honors:

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

2013 Excellence in Peer Review, Journal of Natural Gas Science & Engineering, Elsevier.

2012 SPE Petroleum Engineering Junior Faculty Research Initiation Award.

Associate Editor for SPE Journal.

Associate Editor for Journal of Natural Gas Science & Engineering.

Pioneer Corporation Faculty Fellowship in Petroleum Engineering, UT Austin.

Highlighted Publications and Google Scholar Profiles:

Zhu, D. and Okuno, R., Multiphase Isenthalpic Flash Integrated with Stability Analysis, Fluid Phase Equilibria, accepted for publication on April 5, 2016.

Kumar, A. and Okuno, R. A New Algorithm for Multiphase Fluid Characterization for Solvent Injection, SPE Journal, accepted for publication on March 8, 2016.

Venkatramani, A. and Okuno, R., Characterization of Water-Containing Reservoir Oil using an EOS for Steam Injection Processes, Journal of Natural Gas Science & Engineering, Volume 26, pp. 1091-1106, 2015.

Zhang, B. and Okuno, R., Modeling of Capacitance Flow Behavior in EOS Compositional Simulation, Journal of Petroleum Science and Engineering, Volume 131, pp. 96-113, 2015.

Kumar, A. and Okuno, R., Direct Perturbation of the Peng-Robinson Attraction and Covolume Parameters for Reservoir Fluid Characterization, Chemical Engineering Science, Volume 127, pp. 293-309, 2015.

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, 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, 2014.

Okuno, R. and Xu, Z., Efficient Displacement of Heavy Oil by Use of Three Hydrocarbon Phases, SPE Journal, Volume 19, Number 5, pp. 956-973, 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, 2012.

Okuno, R., Johns, R.T., and Sepehrnoori, K., Three-Phase Flash in Compositional Simulation Using a Reduced Method, SPE Journal, Volume 15, Number 3, pp. 689-703, September 2010.

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.