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Photo of Okuno, Ryosuke
Office Location: CPE 5.118B

Ryosuke Okuno

Associate Professor

Pioneer Corporation Faculty Fellow in Petroleum Engineering

Department Research Areas:
Geologic Carbon Storage
Enhanced Oil Recovery
Hydraulic Fracturing and Reservoir Geomechanics
Reservoir Engineering
Unconventional Resources
Petrophysics and Pore Scale Processes
Reservoir Simulation

Personal Website:

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:

SPE Regional Reservoir Description and Dynamics Award – Southwestern Region, April 2019.

SPE Petroleum Engineering Junior Faculty Research Initiation Award, 2012.

Associate Editor for SPE Journal.

Technical Editor Award, SPE Journal, SPE, 2017, 2018, 2019.

Technical Editor Award, SPE Reservoir Evaluation & Engineering, SPE, 2015, 2016, 2017, 2018, 2019.

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

Highlighted Publications and Google Scholar Profile:

Achour, S.H. and Okuno, R., Phase Stability Analysis for Tight Porous Media by Minimization of the Helmholtz Free Energy. Fluid Phase Equilibria, Volume 520, p. 112648, October 1, 2020.

Wang, M., Baek, K., Abeykoon, G.A., Argüelles-Vivas, F.J. and Okuno, R., Comparative Study of Ketone and Surfactant for Enhancement of Water Imbibition in Fractured Porous Media, Energy and Fuels, Volume 24, Issue 5, pp. 5159 – 5167, May 21, 2020.

Lara Orozco, R.A., Abeykoon, G.A., Wang, M., Argüelles-Vivas, F.J., Okuno, R., Lake, L.W., Ayirala, S.C., and AlSofi, A.M., Amino Acid as a Novel Wettability Modifier for Enhanced Waterflooding in Carbonate Reservoirs, SPE Reservoir Evaluation & Engineering, Volume 23, Issue 02, pp. 741 – 757, May 2020.

Sheng, K., Argüelles-Vivas, F.J., Baek, K., and Okuno, R., An Experimental Study of Emulsion Flow in Alkaline Solvent Coinjection with Steam for Heavy-Oil/Bitumen Recovery, SPE Reservoir Evaluation & Engineering, Volume 23, Issue 02: pp. 402 – 413, May 2020.

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, pp. 1201 – 1222, August 2018.

Zhu, D., Eghbali, S., Shekhar, C., and Okuno, R., A Unified Algorithm for Phase-Stability/Split Calculation for Multiphase Isobaric-Isothermal 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.

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.