Achour Sofiane H. Modeling of Multiphase Multicomponent Transport in Tight Porous Media[M]. The University of Texas at Austin, 2023.
Year: 2023
[ DOI ] not online yet

not online yet
Achour, S.H., Sheng, K., Lawal, T., and Okuno, R., Thermodynamic Modeling of Aqueous Nanobubble Dispersion, SPE Annual Technical Conference and Exhibition, October 16 – 18, 2023, San Antonio, Texas.
Year: 2023
[ DOI ] [ PDF ]

Achour S H, Sheng K, Lawal T, et al. Thermodynamic Modeling of Aqueous Nanobubble Dispersion. SPE Annual Technical Conference and Exhibition. SPE, 2023
Year: 2023
[ DOI ] [ PDF ]

Lara Orozco, R.A., Okuno, R., and Lake, L.W., Analytical Solutions for the Injection of Wettability Modifiers in Carbonate Reservoirs based on a Reduced Surface Complexation Model, Geoenergy Science & Engineering, Volume 227, p. 211825, August 2023. https://doi.org/10.1016/j.geoen.2023.211825
Year: 2023
[ DOI ] [ PDF ]

Coelho, F.M.C., Okuno, R., Sepehrnoori, K., and Ezekoye, O.A., A Comparative Study of the Cubic-Plus-Association Equation of State and a Peng-Robinson Equation of State-Based Solid Model for Asphaltene Simulation in the Wellbore, SPE Production & Operations, Volume 38, Issue 1, pp. 125 – 145, February 8, 2023. https://doi.org/10.2118/212293-PA
Year: 2023
[ DOI ] [ PDF ]

Oyenowo, O.P., Sheng, K., and Okuno, R., Simulation Case Studies of Aqueous Formate Solution for Geological Carbon Storage, Fuel, Volume 334, Part 1, p. 126643, February 15, 2023. https://doi.org/10.1016/j.fuel.2022.126643
Year: 2023
[ DOI ] [ PDF ]

Carrasco-Jaim, O.A., Xia, H., Weerasooriya, U.P., and Okuno, R., CO2 Capture as Bicarbonate using DMAPA with Incorporation of Surface Activity, Fuel, Volume 348, p. 128554, September 2023. https://doi.org/10.1016/j.fuel.2023.128554
Year: 2023
[ DOI ] [ PDF ]

Achour, S.H. and Okuno, R., Advanced Modeling of Diffusion and Convection in Multiphase Compositional Simulation for Tight Porous Media, SPE Reservoir Simulation Conference, March 28 – 30, 2023, Galveston, Texas.
Year: 2023
[ DOI ] [ PDF ]

Sheng, K., Okuno, R., Al-Gawfi, A., and Nakutnyy, P., The Impact of Permeability Barriers on Steam-Solvent Coinjection – A Mechanistic Study Using a Physical Model, Geoenergy Science & Engineering, Volume 223, p. 211569, April 2023. https://doi.org/10.1016/j.geoen.2023.211569
Year: 2023
[ DOI ] [ PDF ]

Achour, S.H. and Okuno, R., Advanced Modeling of Diffusion and Convection in Multiphase Compositional Simulation for Tight Porous Media, Geoenergy Science & Engineering, Volume 230, p. 212183, November 2023. https://doi.org/10.1016/j.geoen.2023.212183
Year: 2023
[ DOI ]

Wang H, Lawal T, Achour S H, et al. Aqueous Nanobubble Dispersion of CO2 at Pressures Up To 208 bara[J]. Energy & Fuels, 2023.
Year: 2023
[ DOI ] [ PDF ]

Achour, S.H. and Okuno, R., Application of Multicomponent Sorption for Diffusive Transport in Numerical Simulation of Tight Reservoirs, Geoenergy Science and Engineering, Volume 221, p. 111262, February 2023. https://doi.org/10.1016/j.petrol.2022.111262
Year: 2023
[ DOI ] [ PDF ]

Wang, H., Oyenowo, P.O., and Okuno, R., Aqueous Formate Solution for Enhanced Water Imbibition in Oil Recovery and Carbon Storage in Carbonate Reservoirs, Fuel, Volume 345, p. 128198, August 2023. https://doi.org/10.1016/j.fuel.2023.128198
Year: 2023
[ DOI ] [ PDF ]

Oyenowo, O.P., Wang, H., Okuno, R., Mirzaei-Paiaman, A., and Sheng, K., Geochemical Impact on Rock Wettability in Injection of High-Concentration Formate Solution for Enhanced Geologic Carbon Storage and Oil Recovery, SPE International Conference on Oilfield Chemistry, June 28 – 29, 2023, The Woodlands, Texas.
Year: 2023
[ DOI ] [ PDF ]

Sheng, K., Okuno, R., Al-Gawfi, A., Nakutnyy, P., Imran, M., and Nakagawa, K., An Experimental Study of Steam-Solvent Coinjection for Bitumen Recovery Using a Large-Scale Physical Model, SPE Journal, Volume 27, Issue 1, pp. 381 – 398, February 16, 2022. https://doi.org/10.2118/205158-PA
Year: 2022
[ DOI ]

Lawal, T., Wang, M., Abeykoon, G.A., Argüelles-Vivas, F.J., and Okuno, R., The Effect of Chemical Partition Behavior on Oil Recovery by Wettability Alteration in Fractured Tight Reservoirs, Energy & Fuels, Volume 36, pp. 797 – 805, January 3, 2022. https://doi.org/10.1021/acs.energyfuels.1c03344
Year: 2022
[ DOI ]

Lara Orozco, R.A., Abeykoon, G.A., Okuno, R., and Lake, L.W., An Electro-Kinetic Study of Amino Acid and Potential-Determining Ions for Enhanced Waterflooding in Carbonate Reservoirs, SPE Reservoir Evaluation & Engineering, Volume 25, Issue 2, pp. 302 – 318, May 11, 2022. https://doi.org/10.2118/201482-PA
Year: 2022
[ DOI ] [ PDF ]

Sheng, K., Amer, H., Liu, Y., Okuno, R., Al-Gawfi, A., Nakutnyy, P., and Nakagawa, K., A New Experimental Method for Comparing Solvents in Steam-Solvent Coinjection for Bitumen Recovery under Controlled Thermodynamic Conditions, Journal of Petroleum Science & Engineering, Volume 213, p. 110377, June 2022. https://doi.org/10.1016/j.petrol.2022.110377
Year: 2022
[ DOI ] [ PDF ]

Lara Orozco R A. Wettability alteration by glycine and seawater injection in carbonate reservoirs[M]. The University of Texas at Austin, 2022.
Year: 2022
[ DOI ]

Achour, S.H. and Okuno, R., A New Model of Compositional Transport in Sorbed Layers for Multicomponent Multiphase Simulation of Tight Reservoirs, European Conference on the Mathematics of Geological Reservoirs, September 5 – 7, 2022, The Hague, The Netherlands and Online.
Year: 2022
[ DOI ]

Sheng, K., Okuno, R., Al-Gawfi, A., and Nakutnyy, P., A Study of the Impact of Permeability Barriers on Steam-Solvent Coinjection Using a Large-Scale Physical Model, SPE Improved Oil Recovery Conference, April 25 – 29, 2022, Virtual.
Year: 2022
[ DOI ]

Wang, M., Abeykoon, G.A., Argüelles-Vivas, F.J., and Okuno, R., Aqueous Solution of 3-Pentanone for Enhanced Oil Production from Tight Porous Media, Journal of Petroleum Science and Engineering, Volume 213, p. 110376, June 2022. https://doi.org/10.1016/j.petrol.2022.110376
Year: 2022
[ DOI ] [ PDF ]

Baek, K., Liu, M., Argüelles-Vivas, F.J., Abeykoon, G.A., and Okuno, R., The Effect of Surfactant Partition Coefficient and Interfacial Tension on Oil Displacement in Low-Tension Polymer Flooding, Journal of Petroleum Science and Engineering, Volume 214, p. 110487, July 2022. https://doi.org/10.1016/j.petrol.2022.110487
Year: 2022
[ DOI ] [ PDF ]

Achour, S.H. and Okuno, R., A Single-Phase Diffusion Model for Gas Injection in Tight Oil Reservoirs, Journal of Petroleum Science & Engineering, Volume 213, p. 110469, June 2022. https://doi.org/10.1016/j.petrol.2022.110469
Year: 2022
[ DOI ] [ PDF ]

Baghishov, I., Abeykoon, G.A., Mingyuan, W., Oyenowo, O.P., Argüelles-Vivas, F.J., and Okuno, R., A Mechanistic Comparison of Formate, Acetate, and Glycine as Wettability Modifiers for Carbonate and Shale Formations, Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 652, November 5, 2022. https://doi.org/10.1016/j.colsurfa.2022.129849
Year: 2022
[ DOI ] [ PDF ]

Lara Orozco, R.A., Abeykoon, G.A., Okuno, R., and Lake, L.W., The Impact of Glycine on The Zeta Potential of Calcite at Different Temperatures and Brine Compositions, Colloids and Surfaces A: Physicochemical and Engineering Aspects, Volume 624, p. 126851, September 2021. https://doi.org/10.1016/j.colsurfa.2021.126851
Year: 2021
[ DOI ] [ PDF ]

Sheng, K., Okuno, R., Imran, M., and Yamada, T., An Experimental Study of Steam-Assisted Gravity Drainage, SPE Journal, Volume 26, Issue 3, pp. 1515 – 1534, June 16, 2021. https://doi.org/10.2118/200867-PA
Year: 2021
[ DOI ] [ PDF ]

Wang M. Aqueous solution of ketone solvent for enhanced oil recovery in tight reservoirs [M]. The University of Texas at Austin, 2021.
Year: 2021
[ DOI ]

Sheng K. Interplay of multicomponent phase behavior and flow in steam-solvent coinjection for heavy-oil and bitumen recovery[M]. The University of Texas at Austin, 2021.
Year: 2021
[ DOI ]

Achour, S.H. and Okuno, R., Two-Phase Flash for Tight Porous Media by Minimization of the Helmholtz Free Energy. Fluid Phase Equilibria, Volume 534, p. 112960, April 15, 2021. https://doi.org/10.1016/j.fluid.2021.112960
Year: 2021
[ DOI ] [ PDF ]

Sheng, K., Okuno, R., Imran, M., and Yamada, T., An Experimental Study of Steam-Assisted Gravity Drainage Using a Large-Scale Physical Model, SPE Western Regional Meeting, April 20 – 22, 2021, Virtual.
Year: 2021
[ DOI ]

Liu, M., Baek, K., Abeykoon, G.A., Argüelles-Vivas, F.J. and Okuno, R., Effects of Surfactant Partition Coefficient and Interfacial Tension on Oil Displacement in Low-Tension Polymer Flooding, SPE Annual Technical Conference and Exhibition, September 21 – 23, 2021, Dubai, UAE (virtual presentation).
Year: 2021
[ DOI ]

Sheng, K., Okuno, R., Al-Gawfi, A., Nakutnyy, P., Imran, M., and Nakagawa, K., An Experimental Study of Steam-Solvent Coinjection for Bitumen Recovery Using a Large-Scale Physical Model, SPE EUROPEC, October 18 – 21, 2021, Amsterdam, The Netherlands (virtual presentation).
Year: 2021
[ DOI ]

Lara Orozco, R.A., Okuno, R., and Lake, L.W., Analytical Solutions for the Injection of Wettability Modifiers in Carbonate Reservoirs Based on a Reduced Surface Complexation Model. SPE Annual Technical Conference and Exhibition, September 21 – 23, 2021, Dubai, UAE (virtual presentation).
Year: 2021
[ DOI ]

Baghishov, I., Abeykoon, G.A., Wang, M., Argüelles-Vivas, F.J., and Okuno, R., Glycine for Enhanced Water Imbibition in Tight Reservoirs – What is the Role of Amino Group? SPE Annual Technical Conference and Exhibition, September 21 – 23, 2021, Dubai, UAE (virtual presentation).
Year: 2021
[ DOI ]

Wang, M., Argüelles-Vivas, F.J., Abeykoon, G.A., and Okuno, R., The Effect of Initial Water Saturation on Enhanced Water Imbibition by Surfactant for Fractured Tight Porous Media, SPE Journal, Volume 26, Issue 2, pp. 847 – 859, April 14, 2021. https://doi.org/10.2118/200431-PA
Year: 2021
[ DOI ] [ PDF ]

Oyenowo, O.P., Sheng, K., Abeykoon, G.A., and Okuno, R., A Case Study of Using Aqueous Formate Solution for Carbon Sequestration and Geological Storage, The GEOGULF 2021 Conference, October 27 – 29, 2021, Austin, Texas. GCAGS Transactions, Volume 71, pp. 203 – 215.
Year: 2021
[ DOI ] [ PDF ]

Zhao, M. and Okuno, R., A Proxy Peng-Robinson EOS for Efficient Modeling of Phase Behavior, SPE Reservoir Simulation Conference, October 4 – 6, 2021, Galveston, Texas, USA (virtual presentation).
Year: 2021
[ DOI ]

Wang, M., Abeykoon, G.A., Argüelles-Vivas, F.J., and Okuno, R., Aqueous Solution of Ketone for Enhanced Water Imbibition in Shale Reservoirs, SPE EUROPEC, October 18 – 21, 2021, Amsterdam, The Netherlands (virtual presentation).
Year: 2021
[ DOI ]

Lawal, T., Wang, M., Abeykoon, G.A., Argüelles-Vivas, F.J., and Okuno, R., The Effect of Chemical Partition Behavior on Oil Recovery by Wettability Alteration in Fractured Tight Reservoirs. Unconventional Resources Technology Conference (URTeC), SPE/AAPG/SEG Unconventional Resources Technology, July 26 – 28, 2021, Houston, Texas, USA.
Year: 2021
[ DOI ] [ PDF ]

Sheng, K., Okuno, R., Imran, M., Nakutnyy, P.P., and Nakagawa, K. An Experimental Study of Steam-Solvent Coinjection for Bitumen Recovery Using a Large-Scale Physical Model, EAGE 21st European Symposium on Improved Oil Recovery, April 19 – 22, 2021, Virtual.
Year: 2021
[ DOI ] [ PDF ]

Wang, M., Argüelles-Vivas, F.J., and Okuno, R., Robust and Efficient Determination of Saturation Pressure from Constant Mass Expansion Data, AIChE Journal, Volume 67, Issue 5, e17166, January 14, 2021. https://doi.org/10.1002/aic.17166
Year: 2021
[ DOI ] [ PDF ]

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. https://doi.org/10.1016/j.fluid.2020.112648
Year: 2020
[ DOI ] [ PDF ]

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 & Fuels, Volume 34, Issue 5, pp. 5159 – 5167, May 21, 2020. https://doi.org/10.1021/acs.energyfuels.9b03571
Year: 2020
[ DOI ] [ PDF ]

Argüelles-Vivas, F.J., Wang, M., Abeykoon, G.A., and Okuno, R., Enhancement of Water Imbibition in Shales by Use of Ketone Solvent, SPE International Conference and Exhibition on Formation Damage Control, 19 – 20 February, 2020, Lafayette, Louisiana, USA.
Year: 2020
[ DOI ]

Wang, M., Abeykoon, G.A., Argüelles-Vivas, F.J., and Okuno, R., Aqueous Solution of Ketone Solvent for Enhanced Water Imbibition in Fractured Carbonate Reservoirs. SPE Journal, Volume 25, Issue 5, pp. 2694 – 2709, October 15, 2020. https://doi.org/10.2118/200340-PA
Year: 2020
[ DOI ] [ PDF ]

Lara Orozco, R.A., Abeykoon, G.A., Okuno, R., and Lake, L.W., An Electro-Kinetic Study of Amino Acid and Potential Determining Ions for Enhanced Waterflooding in Carbonate Reservoirs, SPE Annual Technical Conference and Exhibition, 11 – 14 October, 2020, Virtual.
Year: 2020
[ DOI ]

Achour, S.H. and Okuno, R., Two-Phase Flash for Tight Porous Media by Minimization of the Helmholtz Free Energy, SPE Improved Oil Recovery Conference, August 31 – September 4, 2020, Virtual.
Year: 2020
[ DOI ]

Hoon Baek K. Application of Different Types of Solvents for Heavy Oil Recovery: Experimental Study on Dimethyl Ether, Organic Alkalis, and Surface Active Solvents[M]. The University of Texas at Austin, 2020.
Year: 2020
[ DOI ]

Wang, M., Argüelles-Vivas, F.J., Abeykoon, G.A., and Okuno, R., The Effect of Phase Distribution on Imbibition Mechanisms for Enhanced Oil Recovery in Tight Reservoirs, SPE Improved Oil Recovery Conference, August 31 – September 4, 2020, Virtual.
Year: 2020
[ DOI ]

Wang, M., Abeykoon, G.A., Argüelles-Vivas, F.J. and Okuno, R., Aqueous Solution of Ketone Solvent for Enhanced Oil Recovery in Tight Reservoirs, SPE Improved Oil Recovery Conference, August 31 – September 4, 2020, Virtual.
Year: 2020
[ DOI ]

Neshat, S., Okuno, R., and Pope, G.A., Simulation and Thermodynamic Modeling of Solvent EOR and Bitumen Recovery in Organic-Rich Tight Reservoirs, SPE Improved Oil Recovery Conference, August 31 – September 4, 2020, Virtual.
Year: 2020
[ DOI ]

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. https://doi.org/10.2118/195907-PA
Year: 2020
[ DOI ] [ PDF ]

Achour, S.H. and Okuno, R., A Mechanistic Mixing Model for Miscible Gas Injection in Tight Oil Reservoirs, Unconventional Resources Technology Conference (URTeC), SPE/AAPG/SEG Unconventional Resources Technology, July 20 – 22, 2020, Virtual.
Year: 2020
[ DOI ]

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. https://doi.org/10.2118/190224-PA
Year: 2020
[ DOI ] [ PDF ]

Neshat S S. Phase Behavior and Compositional Simulation of Solvent EOR Processes in Unconventional Reservoirs[M]. The University of Texas at Austin, 2020.
Year: 2020
[ DOI ]

Neshat, S.S., Okuno, R., and Pope, G.A., Simulation of Solvent Treatments for Fluid Blockage Removal in Tight Formations Using Coupled Three-Phase Flash and Capillary Pressure Models. Journal of Petroleum Science and Engineering, Volume 195, p. 107442, December 2020. Featured for the topics of “Tight Gas/Shale Gas/Coalbed Methane” in Journal of Petroleum Technology, October 1, 2018. https://doi.org/10.1016/j.petrol.2020.107442
Year: 2020
[ DOI ] [ PDF ]

Argüelles-Vivas, F.J., Wang, M., Abeykoon, G.A., and Okuno, R., Oil Recovery from Fractured Porous Media with/without Initial Water Saturation by Using 3-Pentanone and Its Aqueous Solution. Fuel, Volume 276, p. 118031, September 15, 2020. https://doi.org/10.1016/j.fuel.2020.118031
Year: 2020
[ DOI ] [ PDF ]

Baek, K., Argüelles-Vivas, F.J., Abeykoon, G.A., Okuno, R., Weerasooriya, U.P., Low-Tension Polymer Flooding Using Short-Hydrophobe Surfactant for Heavy Oil Recovery, Energy & Fuels, Volume 34, Issue 12, pp. 15936 – 15948, November 23, 2020. https://doi.org/10.1021/acs.energyfuels.0c02720
Year: 2020
[ DOI ] [ PDF ]

Wang, M., Baek, K., Abeykoon, G.A., Argüelles-Vivas, F.J., and Okuno, R., Oxygenated Solvent as a Novel Additive for Improved Oil Recovery in Tight Oil Reservoirs, SPE Annual Technical Conference and Exhibition, 30 September – 2 October, 2019, Calgary, Alberta, Canada.
Year: 2019
[ DOI ]

Wang, M., Abeykoon, G.A., Argüelles-Vivas, F.J., and Okuno, R., Ketone Solvent as a Wettability Modifier for Improved Oil Recovery from Oil-Wet Porous Media, Fuel, Volume 258, p. 116195, December 15, 2019. https://doi.org/10.1016/j.fuel.2019.116195
Year: 2019
[ DOI ] [ PDF ]

Wang, M., Abeykoon, G.A., Argüelles-Vivas, F.J., and Okuno, R., Novel Wettability Modifiers for Improved Oil Recovery in Tight Oil Reservoirs, SPE/AAPG/SEG Unconventional Resources Technology Conference (URTeC), 22 – 24 July, 2019, Denver, Colorado, USA.
Year: 2019
[ DOI ]

Baek, K., Okuno, R., Sharma, H., and Weerasooriya, U.P., Oil-in-Water Emulsification of Athabasca Bitumen with Pyrrolidine Solution, Fuel, Volume 246, pp. 425 – 442, 15 June 2019. https://doi.org/10.1016/j.fuel.2019.02.123
Year: 2019
[ DOI ] [ PDF ]

Neshat, S.S., Okuno, R., and Pope, G.A., Thermodynamic Stability Analysis of Multi-Component Mixtures with Capillary Pressure, SPE Reservoir Simulation Conference, April 10 – 11, 2019, Galveston, Texas, USA.
Year: 2019
[ DOI ]

Baek, K., Argüelles-Vivas, F.J., Abeykoon, G.A., Okuno, R., and Weerasooriya, U.P., Application of Ultrashort Hydrophobe Surfactants with Cosolvent Characters for Heavy Oil Recovery, Energy & Fuels, Volume 33, Issue 9, pp. 8241 – 8249, September 19, 2019. https://doi.org/10.1021/acs.energyfuels.9b01716
Year: 2019
[ DOI ] [ PDF ]

Baek, K., Sheng, K., Argüelles-Vivas, F.J., and Okuno, R., Comparative Study of Oil-Dilution Capability of Dimethyl Ether and Hexane as Steam Additives for Steam-Assisted Gravity Drainage, SPE Reservoir Evaluation & Engineering, Volume 22, Issue 3, pp. 1030 – 1048, August 2019. https://doi.org/10.2118/187182-PA
Year: 2019
[ DOI ] [ PDF ]

Baek, K., Argüelles-Vivas, F.J., Abeykoon, G.A., Okuno, R., and Weerasooriya, U.P., Application of Novel Surfactants with Co-Solvent Character for Heavy Oil Recovery, SPE Western Regional Meeting, April 23 – 26, 2019, San Jose, California, USA.
Year: 2019
[ DOI ] [ PDF ]

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 Annual Technical Conference and Exhibition, 30 September – 2 October, 2019, Calgary, Alberta, Canada.
Year: 2019
[ DOI ]

Baek, K. Argüelles-Vivas, F.J., Okuno, R., Sheng, K., Sharma, H., and Weerasooriya, U.P., An Experimental Study of Emulsion Phase Behavior and Viscosity for Athabasca-Bitumen/Diethylamine/Brine Mixtures, SPE Reservoir Evaluation & Engineering, Volume 22, Issue 02, pp. 628 – 641, May 2019. https://doi.org/10.2118/189768-PA
Year: 2019
[ DOI ] [ PDF ]

Argüelles-Vivas, F.J. and Okuno, R., A Novel Educational Laboratory Experiment for Constant-Mass Expansion of Petroleum Fluids, Education for Chemical Engineers, Volume 27, pp. 12 – 19, April 2019. https://doi.org/10.1016/j.ece.2018.12.001
Year: 2019
[ DOI ] [ PDF ]

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. https://doi.org/10.1016/j.fuel.2017.12.110
Year: 2018
[ DOI ] [ PDF ]

Liu, Y., Li, H.A., and Okuno, R., Phase Behavior of N2/n-C4H10 in a Partially Confined Space Derived from Shale Sample, Journal of Petroleum Science and Engineering, Volume 160, pp. 442 – 451, January 2018. https://doi.org/10.1016/j.petrol.2017.10.061
Year: 2018
[ DOI ] [ PDF ]

Neshat, S., Okuno, R., and Pope, G.A., Simulation of Water and Condensate Blockage and Solvent Treatments in Tight Formations Using Coupled Three-Phase Flash and Capillary Pressure Models, SPE Improved Oil Recovery Conference, 14 – 18 April, 2018, Tulsa, Oklahoma, USA.
Year: 2018
[ DOI ]

Venkatramani, A. and Okuno, R., Steam-Oil Ratio in Steam-Solvent Coinjection Simulation for Homogeneous and Heterogeneous Bitumen Reservoirs, Journal of Energy Resources Technology, Volume 140, pp.112903-1 – 112903-17, November 2018. https://doi.org/10.1115/1.4040529
Year: 2018
[ DOI ] [ PDF ]

Baek, K., Argüelles-Vivas, F.J., Okuno, R., Sheng, K., Sharma, H., and Weerasooriya, U.P., Organic Alkali as a Steam Additive for Improved SAGD: Experimental Study of Emulsion Phase Behavior and Viscosity, SPE Canada Heavy Oil Technical Conference, 13 – 14 March, 2018, Calgary, Alberta, Canada.
Year: 2018
[ DOI ]

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. https://doi.org/10.2118/184983-PA
Year: 2018
[ DOI ] [ PDF ]

Neshat, S.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, pp. 1438 – 1451, August 2018. https://doi.org/10.2118/187260-PA
Year: 2018
[ DOI ] [ PDF ]

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 Improved Oil Recovery Conference, 14 – 18 April, 2018, Tulsa, Oklahoma, USA.
Year: 2018
[ DOI ] [ PDF ]

Baek, K., Argüelles-Vivas, F.J., Okuno, R., Sheng, K., Sharma, H., and Weerasooriya, U.P., Emulsification of Athabasca Bitumen by Organic Alkali: Emulsion Phase Behavior and Viscosity for Athabasca-Bitumen/Brine/Triethylenetetramine, Journal of Petroleum Science and Engineering, Volume 168, pp. 359 – 369, September 2018. https://doi.org/10.1016/j.petrol.2018.04.063
Year: 2018
[ DOI ] [ PDF ]

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. https://doi.org/10.2118/175060-PA
Year: 2018
[ DOI ] [ PDF ]

Gao, J., Okuno, R., and Li, H.A., A Phase-Behavior Study for n-Hexane/Bitumen and n-Octane/Bitumen Mixtures, SPE Journal, Volume 23, Issue 1, pp. 128 – 144, February 2018. https://doi.org/10.2118/186097-PA
Year: 2018
[ DOI ] [ PDF ]

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. https://doi.org/10.1002/aic.16191
Year: 2018
[ DOI ] [ PDF ]

Venkatramani, A. and Okuno, R., Mechanistic Simulation Study of Expanding-Solvent Steam-Assisted Gravity Drainage under Reservoir Heterogeneity, Journal of Petroleum Science and Engineering, Volume 169, pp. 146-156, October 2018. https://doi.org/10.1016/j.petrol.2018.04.074
Year: 2018
[ DOI ] [ PDF ]

Gao, J., Okuno, R., and Li, H.A., An Experimental Study of Multiphase Behavior for n-Butane/Bitumen/Water Mixtures, SPE Journal, Volume 22, Issue 3, pp. 783-798, June 2017. http://dx.doi.org/10.2118/180736-PA
Year: 2017
[ DOI ] [ PDF ]

Venkatramani, A. and Okuno, R., Compositional Mechanisms in SAGD and ES-SAGD with Consideration of Water Solubility in Oil, SPE Reservoir Evaluation & Engineering, Volume 20, Issue 3, pp. 681 – 697, August 2017. http://dx.doi.org/10.2118/180737-PA
Year: 2017
[ DOI ] [ PDF ]

Zhu D. Simultaneous phase-stability/-split computation for multiphase oil-displacement simulation[M]. The University of Texas at Austin, 2017.
Year: 2017
[ DOI ]

Neshat, S.S., Okuno, R., and Pope, G.A., A Rigorous Solution to the Problem of Phase Behavior in Unconventional Formations with High Capillary Pressure, SPE Annual Technical Conference and Exhibition, 9 – 11 October, 2017, San Antonio, Texas, USA.
Year: 2017
[ DOI ]

McGuire, P., Okuno, R., Gould, T., and Lake L.W., Ethane-Based EOR: An Innovative and Profitable EOR Opportunity for a Low Price Environment, SPE Reservoir Evaluation & Engineering, Volume 20, Issue 1, February 2017. http://dx.doi.org/10.2118/179565-PA (Featured in The American Oil & Gas Reporter as February 2017 Cover Story)
Year: 2017
[ DOI ]

Venkatramani A V. Steam-Solvent Coinjection for Bitumen Recovery Under Reservoir Heterogeneity With Consideration of Water Solubility in Oil [M]. University of Alberta, 2017.
Year: 2017
[ DOI ]

Venkatramani, A. and Okuno, R., Characterization of Reservoir Heterogeneity for SAGD and ES-SAGD: Under What Type of Heterogeneity is ES-SAGD More Likely to Lower SOR?, SPE Annual Technical Conference and Exhibition, 9 – 11 October, 2017, San Antonio, Texas, USA.
Year: 2017
[ DOI ]

Baek, K., Sheng, K., Argüelles-Vivas, F.J., and Okuno, R., Comparative Study of Oil-Dilution Capability of Dimethyl Ether (DME) and Hexane as Steam Additives for SAGD, SPE Annual Technical Conference and Exhibition, 9 – 11 October, 2017, San Antonio, Texas, USA.
Year: 2017
[ DOI ]

Sheng, K., Okuno, R., and Wang, M., Water-Soluble Solvent as an Additive to Steam for Improved SAGD, SPE Canada Heavy Oil Technical Conference, February 15 – 16, 2017, Calgary, Alberta, Canada.
Year: 2017
[ DOI ] [ PDF ]

Jia, W. and Okuno, R., Modeling of the Interaction Between Asphaltene and Water for Multiphase Reservoir Fluids by Use of Cubic-Plus-Association Equation of State, SPE Annual Technical Conference and Exhibition, 9 – 11 October, 2017, San Antonio, Texas, USA.
Year: 2017
[ DOI ]

Venkatramani, A. and Okuno, R., Steam-Solvent Coinjection under Reservoir Heterogeneity: Should ES-SAGD be Implemented for Highly Heterogeneous Reservoirs?, SPE Canada Heavy Oil Technical Conference, February 15 – 16, 2017, Calgary, Alberta, Canada.
Year: 2017
[ DOI ]

Kumar, A. and Okuno, R., Reliable Characterization of Bitumen Based on Perturbation from n-Alkanes for Steam-Solvent Coinjection Simulation, Fuel, Volume 182, pp. 141-153, October 15, 2016. http://dx.doi.org/10.1016/j.fuel.2016.05.095
Year: 2016
[ DOI ] [ PDF ]

Venkatraman, A., Argüelles-Vivas, F.J., Okuno, R., Lake, L.W., and Wheeler, M.F., Modeling Impact of Aqueous Ions on Solubility of CO2 and Its Implications for Sequestration and Enhanced Oil Recovery, SPE Annual Technical Conference and Exhibition, September 26 – 28, 2016, Dubai, UAE.
Year: 2016
[ DOI ]

Venkatramani, A. and Okuno, R., Compositional Mechanisms in SAGD and ES-SAGD with Consideration of Water Solubility in Oil, SPE Canada Heavy Oil Technical Conference, June 7 – 9, 2016, Calgary, Alberta, Canada.
Year: 2016
[ DOI ]

Zhu, D. and Okuno, R., Multiphase Isenthalpic Flash Integrated with Stability Analysis, Fluid Phase Equilibria, Volume 423, pp. 203-219, September 15, 2016. http://dx.doi.org/10.1016/j.fluid.2016.04.005
Year: 2016
[ DOI ] [ PDF ]

Kumar, A. and Okuno, R., A New Algorithm for Multiphase Fluid Characterization for Solvent Injection, SPE Journal, Volume 21, Issue 5, pp. 1688 – 1704, October 2016. http://dx.doi.org/10.2118/175123-PA
Year: 2016
[ DOI ] [ PDF ]

Gao, J., Okuno, R., and Li, H., An Experimental Study of Four-Phase Behavior for n-Butane/Bitumen/Water Mixtures, SPE Canada Heavy Oil Technical Conference, June 7 – 9, 2016, Calgary, Alberta, Canada.
Year: 2016
[ DOI ]

Liu, Y., Li, H.A., and Okuno, R., Phase Behavior of Fluid Mixtures in a Partially Confined Space, SPE Annual Technical Conference and Exhibition, September 26 – 28, 2016, Dubai, UAE.
Year: 2016
[ DOI ]

Liu, Y., Li, H.A., and Okuno, R., Measurements and Modeling of Interfacial Tension for CO2/CH4/Brine Systems under Reservoir Conditions, Industrial & Engineering Chemistry Research, Volume 55, Issue 48, pp. 12358 – 12375, November 2016. http://dx.doi.org/10.1021/acs.iecr.6b02446
Year: 2016
[ DOI ] [ PDF ]

McGuire, P.L, Okuno, R., Gould, T.L., and Lake, L.W., Ethane-Based EOR: An Innovative and Profitable EOR Opportunity for a Low Price Environment, SPE Improved Oil Recovery Symposium, April 9 – 13, 2016, Tulsa, Oklahoma, USA.
Year: 2016
[ DOI ] [ PDF ]

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, May 4, 2015. http://dx.doi.org/10.1016/j.ces.2015.01.032
Year: 2015
[ DOI ] [ PDF ]

Kumar, A. and Okuno, R., A New Algorithm for Multiphase Fluid Characterization for Solvent Injection, SPE Annual Technical Conference and Exhibition, September 28 – 30, 2015, Houston, Texas, USA.
Year: 2015
[ DOI ]

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, September 2015. http://dx.doi.org/10.1016/j.jngse.2015.07.036
Year: 2015
[ DOI ] [ PDF ]

Eghbali, S. and Okuno, R., Successive Substitution Augmented for Global Minimization of the Gibbs Free Energy, SPE Annual Technical Conference and Exhibition, September 28 – 30, 2015, Houston, Texas, USA.
Year: 2015
[ DOI ] [ PDF ]

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. http://dx.doi.org/10.2118/165471-PA
Year: 2015
[ DOI ] [ PDF ]

Zhu, D. and Okuno, R., Robust Isenthalpic Flash for Multiphase Water-Hydrocarbon Mixtures, SPE Journal, Volume 20, Number 6, pp. 1350-1365, December 2015. http://dx.doi.org/10.2118/170092-PA
Year: 2015
[ DOI ] [ PDF ]

Zhu, D. and Okuno, R., Analysis of Narrow-Boiling Behavior for Thermal Compositional Simulation, SPE Reservoir Simulation Symposium, February 23 – 25, 2015, Houston, Texas, USA.
Year: 2015
[ DOI ]

Kumar A. Characterization of Reservoir Fluids based on Perturbation from n-Alkanes[M]. University of Alberta, 2016.
Year: 2015
[ DOI ]

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, July 2015. http://dx.doi.org/10.1016/j.petrol.2015.04.014
Year: 2015
[ DOI ] [ PDF ]

Xu, Z. and Okuno, R., Numerical Simulation of Three-Hydrocarbon-Phase Flow with Robust Phase Identification, SPE Reservoir Simulation Symposium, February 23 – 25, 2015, Houston, Texas, USA.
Year: 2015
[ DOI ] [ PDF ]

Keshavarz, M., Okuno, R., and Babadagli, T., A Semi-Analytical Solution to Optimize Single-Component Solvent Coinjection with Steam during SAGD, Fuel, Volume 144, pp. 400-414, March 15, 2015. http://dx.doi.org/10.1016/j.fuel.2014.12.030
Year: 2015
[ DOI ] [ PDF ]

Zhu, D. and Okuno, R., A Robust Algorithm for Isenthalpic Flash of Narrow-Boiling Fluids, Fluid Phase Equilibria, Volume 379, pp. 26-51, October 15, 2014. http://dx.doi.org/10.1016/j.fluid.2014.07.003
Year: 2014
[ DOI ] [ PDF ]

Keshavarz, M., Okuno, R., and Babadagli, T., Efficient Oil Displacement near the Chamber Edge in ES-SAGD, Journal of Petroleum Science and Engineering, Volume 118, pp. 99-113, June 2014. http://dx.doi.org/10.1016/j.petrol.2014.04.007
Year: 2014
[ DOI ] [ PDF ]

Venkatramani, A. and Okuno, R., Modeling of Multiphase Behavior for Water/n-Alkane Mixtures by Use of the Peng-Robinson EOS, SPE Heavy Oil Conference – Canada, June 10 – 12, 2014, Calgary, Alberta, Canada.
Year: 2014
[ DOI ]

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, October 2014. http://dx.doi.org/10.2118/165470-PA
Year: 2014
[ DOI ] [ PDF ]

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. http://dx.doi.org/10.2118/166345-PA
Year: 2014
[ DOI ] [ PDF ]

Zhu, D. and Okuno, R., A Robust Algorithm for Multiphase Isenthalpic Flash, SPE Heavy Oil Conference – Canada, June 10 – 12, 2014, Calgary, Alberta, Canada.
Year: 2014
[ DOI ]

Iwasaki, S., Liang, Y., Matsuoka, T., Takahashi, S., and Okuno, R., Application of Gibbs Ensemble Monte Carlo to Phase Equilibria of CO2/Hydrocarbon Mixtures, SPE International Petroleum Technology Conference, March 26 – 28, 2013, Beijing, China.
Year: 2013
[ DOI ]

Okuno, R. and Xu, Z., Mass Transfer on Multiphase Transitions in Low-Temperature CO2 Floods, SPE Annual Technical Conference and Exhibition, September 30 – October 2, 2013, New Orleans, LA, USA.
Year: 2013
[ DOI ]

Kumar, A. and Okuno, R., Reservoir Oil Characterization for Compositional Simulation of Solvent Injection Processes, Industrial & Engineering Chemistry Research, Volume 53, Number 1, pp. 440-455, 2014. http://dx.doi.org/10.1021/ie402198z
Year: 2013
[ DOI ] [ PDF ]

Okuno, R. and Xu, Z., Efficient Displacement of Heavy Oil using Three Hydrocarbon Phases, SPE Heavy Oil Conference – Canada, June 11 – 13, 2013, Calgary, Alberta, Canada.
Year: 2013
[ DOI ]

Kumar, A. and Okuno, R., Universal Fluid Characterization Using an EOS Based on Perturbation from n-Alkanes, SPE Annual Technical Conference and Exhibition, September 30 – October 2, 2013, New Orleans, LA, USA.
Year: 2013
[ DOI ]

Kumar, A. and Okuno, R., Characterization of Reservoir Fluids using an EOS Based on Perturbation from n-Alkanes, Fluid Phase Equilibria, Volume 358, pp. 250-271, November 25, 2013. http://dx.doi.org/10.1016/j.fluid.2013.08.035
Year: 2013
[ DOI ] [ PDF ]

Keshavarz, M., Okuno, R., and Babadagli, T., Optimal Application Conditions for Steam-Solvent Coinjection, SPE Heavy Oil Conference – Canada, June 11 – 13, 2013, Calgary, Alberta, Canada.
Year: 2013
[ DOI ]

Zhang, B. and Okuno, R., A New Method for Modeling Bypassed Oil Recovery in EOS Compositional Simulation, SPE Annual Technical Conference and Exhibition, September 30 – October 2, 2013, New Orleans, LA, USA.
Year: 2013
[ DOI ]

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. http://dx.doi.org/10.1016/j.fluid.2012.07.029
Year: 2012
[ DOI ] [ PDF ]

Kumar, A. and Okuno, R., Fluid Characterization using an EOS for Compositional Simulation of Enhanced Heavy-Oil Recovery, SPE Annual Technical Conference and Exhibition, October 8 – 10, 2012, San Antonio, Texas, USA.
Year: 2012
[ DOI ] [ PDF ]

Okuno, R., Johns, R.T., and Sepehrnoori, K., Mechanisms for High Displacement Efficiency of Low-Temperature CO2 Floods, SPE Journal, Volume 16, Number 4, pp. 751-767, December 2011. http://dx.doi.org/10.2118/129846-PA
Year: 2011
[ DOI ] [ PDF ]

Sumikawa, I., Yamada, T., Okuno, R., Okabe, T., and Takahashi, T., Efficient Measurement of Diffusion Coefficients Using a PVT Cell, Journal of the Japanese Association for Petroleum Technology, Volume 75, Number 4, July 2010 (in Japanese).
Year: 2010

Okuno, R., Johns, R.T., and Sepehrnoori, K., Mechanisms for High Displacement Efficiency of Low-Temperature CO2 Floods, SPE Improved Oil Recovery Symposium, April 24 – April 28, 2010, Tulsa, Oklahoma, USA.
Year: 2010
[ DOI ] [ PDF ]

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. http://dx.doi.org/10.2118/117752-PA
Year: 2010
[ DOI ] [ PDF ]

Okuno, R., Johns, R.T., and Sepehrnoori, K., Application of a Reduced Method in Compositional Simulation, SPE Journal, Volume 15, Number 1, pp. 39-49, March 2010. http://dx.doi.org/10.2118/119657-PA
Year: 2010
[ DOI ] [ PDF ]

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. http://dx.doi.org/10.2118/125226-PA
Year: 2010
[ DOI ] [ PDF ]

Okuno, R., Johns, R.T., and Sepehrnoori, K., Three-Phase Flash in Compositional Simulation Using a Reduced Method, 15th European Symposium on Improved Oil Recovery, April 27 – April 29, 2009, Paris, France.
Year: 2009
[ DOI ]

Okuno, R., Johns, R.T., and Sepehrnoori, K., Use of a Reduced Method in Compositional Simulation, 11th European Conference on the Mathematics of Oil Recovery, September 8 – September 11, 2008, Bergen, Norway.
Year: 2008
[ DOI ]

Okuno, R., Johns, R.T., and Sepehrnoori, K., A New Algorithm for Rachford-Rice for Multiphase Compositional Simulation, SPE Eastern Regional/AAPG Eastern Section Joint Meeting, October 11 – October 15, 2008, Pittsburgh, Pennsylvania, USA.
Year: 2008
[ DOI ]