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Ronald Nguele Last modified date:2021.09.02

Assistant Professor / Faculty of Engineering
Department of Earth Resources Engineering
Faculty of Engineering

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 Reseacher Profiling Tool Kyushu University Pure
Academic Degree
Doctor of Engineering
Field of Specialization
Enhanced Oil Recovery (EOR); Unconventional Fossil Production; Petroleum Engineering
ORCID(Open Researcher and Contributor ID)
Research Interests
  • Probing Emulsion Pickering for the Development of HTHP Drilling Fluids
    keyword : Emulsion; drilling fluid
  • Asphaltene & Wax Aggregation
    keyword : Asphalt; Wax; Bitumen; Heavy Oils
  • Non-thermal methods for Unconventional Formations
    keyword : EOR; Chemical-EOR; Nano-particles
Academic Activities
1. Ronald Nguele, Katia Nchimi Nono and Kyuro Sasaki, Ronald Nguele, Katia Nchimi Nono and Kyuro Sasaki, 10.5772/INTECHOPEN.95838, 2021.01, [URL], Large volumes of unconventional fossil resource are untapped because of the
capillary forces, which kept the oil stranded underground. Furthermore, with the increasing demand for sustainable energy and the rising attention geared towards environment protection, there is a vital need to develop materials that bridge the gap between the fossil and renewable resources effectively. An intensive attention has been given to nanomaterials, which from their native features could increase either the energy storage or improve the recovery of fossil energy. The present chap- ter, therefore, presents the recent advancements of nanotechnology towards the production of unconventional resources and renewable energy. The chapter focuses primarily on nanomaterials applications for both fossils and renewable energies. The chapter is not intended to be an exhaustive representation of nanomaterials, rather it aims at broadening the knowledge on functional nanomaterials for possible engineering applications..
1. Ronald Nguele, Hirota Hikaru, Yuichi Sugai, Kyuro Sasaki, Role of Polymer-Based Nanofluids on Asphaltene Adsorption during Carbon Dioxide (CO2) Injection, Energy & Fuels, 10.1021/acs.energyfuels.1c02333, 2021.08, [URL].
2. Nguele, Ronald Omondi, Brian Adala Yamasaki, Soichiro Mandai, Shusaku Sugai, Yuichi Sasaki, Kyuro, Evaluation of CO2-triggered and thermo-responsive gels for heterogeneous oil formations, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 10.1016/j.colsurfa.2021.126688, 622, 126688, 2021.04.
3. Nguele, Ronald Sasaki, Kyuro, Asphaltene behavior at the interface oil-nanofluids: Implications to adsorption, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 10.1016/j.colsurfa.2021.126630, 622, 126630, 2021.03, [URL], he mechanisms pertaining to the asphaltene adsorption at the interface oil/silica-based nanofluid and oil/wetted sandstone are examined. Asphaltene sample, extracted from a dead heavy oil using n-heptane, was dissolved into toluene to obtain a solution with a concentration of 3.23 mg/g. The solution was allowed to contact crushed Berea sandstone wetted with different silica-based nanofluids in the presence of carbon dioxide (CO2) bubbling. The silica-based nanofluid was prepared by dispersing silica oxide nanoparticle (0.1 wt%) into an aqueous solution of modified polyvinyl alcohol (1 wt%). Both batch and dynamic adsorptions were performed. A Solid-Liquid Equilibrium (SLE) model was employed not only to describe the adsorption mechanisms, but also to obtain the adsorptions parameters including the adsorption affinity and the asphaltene-self aggregation. The batch adsorption results reveal that asphaltenes develop a stronger affinity with the silica nanofluid film, which leads to an adsorption four-fold lower compared to sandstone wetted with the base fluid (polymer). It is also shown that the adsorption decreases with the decrease in the concentration of the polymer. In respect of the intrinsic properties of asphaltenes, it is found that the asphaltene molecules with a large aromatic core diffuse less, thus have a low adsorption. Irrespective of the core size, the affinity at the nanofluid film increases with the ratio in heteroatom-to-total carbon. Furthermore, the chemistry of the base fluid acts upon both the adsorption affinity and asphaltene self-association. Dynamic adsorption results on a nanofluid-wet sandstone were found three-fold larger compared to batch adsorption results. The primary reason is attributed to the alteration of the diffusion-barrier by the water, which promotes owing to the self-association of asphaltenes..
4. Eric O. Ansah, Yuichi Sugai, Ronald Nguele, KyuroSasaki, Integrated microbial enhanced oil recovery (MEOR) simulation: Main influencing parameters and uncertainty assessment, Journal of Petroleum Science and Engineering, 10.1016/j.petrol.2018.08.005, 2018.08.
5. Zhen Hao Lim; Hikmat Said Al Salim; Norida Ridzuan; Ronald Nguele; Kyuro Sasaki, Effect of surfactants and their blend with silica nanoparticles on wax deposition in a Malaysian crude oil, Petroleum Science, 10.1007/s12182-018-0241-2, 2, 1-14, 2018.07.
6. Ronald Nguele, Kyuro Sasaki, Yuichi Sugai, Hikmat Said Al-Salim and Ryo Ueda, Mobilization and displacement of heavy oil by cationic microemulsions in different sandstone formations, Journal of Petroleum Science and Engineering, 10.1016/j.petrol.2017.07.032, 157, 1115-1129, 2017.08.
7. Ronald Nguele, Kyuro Sasaki, Yuichi Sugai, Brian Omondi, Hikmat Said Al-Salim and Ryo Ueda,, Interactions between Formation Rock and Petroleum Fluids during Microemulsion Flooding and Alteration of Heavy Oil Recovery Performance, Energy & Fuels, 10.1021/acs.energyfuels.6b02216, 31, 1, 255-270, 2017.01, [URL].
8. Ronald Nguele , Kyuro Sasaki, Mohammad Reza Ghulami, Yuichi Sugai and Masanori Nakano, Pseudo-Phase Equilibrium of Light and Heavy Crude Oils for Enhanced Oil Recovery, Journal of Petroleum Exploration and Production Technology, 10.1007/s13202-015-0195-5, 6, 3, 419-432, 2016.09, [URL].
9. Brian A. Omondi, Ronald Nguele, Hirotaka Okabe, Yoshiki Hidaka and Kazuhiro Hara, Multicomponent Adsorption of Benzene and Selected Borderline Heavy Metals by Poly (Butadiene-Co-Acrylic Acid) Hydrogel, Journal of Environmental Chemical Engineering, 10.1016/j.jece.2016.07.013, 4, 3, 3385-3392, 2016.09, [URL].
10. Ronald Nguele, Kyuro Sasaki, Hikmat Said Al-Salim, Yuichi Sugai, Arif Widiatmojo and Masanori Nakano, Microemulsion and Phase Behavior Properties of (Dimeric Ammonium Surfactant Salt – Heavy Crude Oil – Connate Water) System, Journal of Unconventional Oil and Gas Resources, 10.1016/j.juogr.2016.03.001, 14, 62-71, 2016.06, [URL].
11. Ronald Nguele, Mohammad Reza Ghulami, Kyuro Sasaki, Hikmat Said Al-Salim, Arif Widiatmojo, Yuichi Sugai and Masanori Nakano,, Asphaltene Aggregation in Crude Oils during Supercritical Gas Injection, Energy & Fuels, 10.1021/acs.energyfuels.5b02903, 30, 2, 1266-1278, 2016.02.
12. Arif Widiatmojo, Kyuro Sasaki, Nuhindro Priagung Widodo, Yuichi Sugai, Amin Yousefi Sahzabi and Ronald Nguele, Predicting gas dispersion in large scale underground ventilation: A particle tracking approach, Building and Environment, 10.1016/j.buildenv.2015.07.025, 95, 171-181, 2016.01, [URL].
13. Ronald Nguele, Kyuro Sasaki, Hikmat Said Al-Salim and Yuichi Sugai, Physicochemical and Microemulsion Properties of Dimeric Quaternary Ammonium Salts with Trimethylene Spacer for Enhanced Oil Recovery, Colloid and Polymer Science, 10.1007/s00396-015-3701-x, 293, 12, 3487-3497, 2015.12, [URL].
14. Arif Widiatmojo, Kyuro Sasaki, Amin Yousefi-Sahzabi, Ronald Nguele, Yuichi Sugai, and Atsushi Maeda, A grid-free particle tracking simulation for tracer dispersion in porous reservoir model, Journal of Unconventional Oil and Gas Resources, 10.1016/j.juogr.2015.05.005, 11, 75-81, 2015.09, [URL].
15. Ronald Nguele, Hikmat Said Al-Salim and Khalid Mohammad, Modelling and Forecasting of Depletion of Additives in Car Engine Oils Using Attenuated Total Reflectance Fast Transform Infrared Spectroscopy, Lubricants, 10.3390/lubricants2040206, 2, 4, 206-222, 2014.04, [URL].
1. Ronald Nguele, Eric O. Ansah, Katia Nchimi Nono, K. Sasaki, Albite-Anorthite Synergistic Effect on the Performance of Nanofluid Enhanced Oil Recovery, European Association of Geoscientists & Engineers, 2020.10, [URL], Large volumes of oil sit within our reach primarily of the strong capillary forces, which themselves are subsequent to the attraction between the polar ends of the oil and the surface charges of bearing-matrix. Altering these interactions occurring within tiny pore throats or even more, unveiling the extent to which the geochemistry impacts these interactions can invariably improve the production. Therefore, we evaluated the performance of water-based nanofluid for oil production with the respect to the geochemistry.

Alumina-silica nanocomposite (Al/Si-NP), synthesized by plasma-method, was used as primary material. Functionalized by dispersing 0.25 wt.% lyophilized NP into the formation water (TDS=4301 ppm) water under carbon dioxide bubbling. The nanofluid, NF, obtained therefrom, was then used for coreflooding tests, which aim at displacing a dead heavy oil (ρ =0.854 g/cm3) from a waterflooded Berea sandstone. The ionic composition of the effluent fluids was tracked and further used for modeling the geochemical interactions. The latter considered mineral precipitation and dissolution as well as ion adsorption and desorption. Model calculations were performed using the transport algorithm in PHREEQC.

The experimental results from coreflood tests showed that Al/Si-NP, injected into a waterflooded sandstone, could displace up to 11% of the oil trapped, which was 10 times higher if no nanofluid as injected. Ionic tracking further revealed that the dissolution of albite along with anorthite weathering; both mechanisms concurred to the logjamming of Al/Si-NF. Furthermore, the geochemical modeling revealed weak and reversible cation exchange between sodium (Na+) and calcium (Ca2+). Also, we found that the pH of the preflush should be mildly basic with for controllable anorthite and albite precipitation plus silica cementation, from which derive Al-Si-NF aggregation. These points were further verified experimentally when the ionic composition was altered accordingly to the geochemical modeling, leading to the conclusion that albite, anorthite and silicate precipitation promotes high recovery, due to high Na+ and K+ ions. Silica cementation was proven to increase formation rock wettability..
2. Ronald Nguele, Kyuro Sasaki , Yuichi Sugai, Hikmat Said Al Salim, and Masanori Nakano, Gas Solubility and Acidity Effects on Heavy Oil Recovery at Reservoir Conditions, The 20th Formation Evaluation Symposium of Japan, 2018.03, [URL].
3. Ronald Nguele, Kyuro Sasaki , Hikmat Said Al Salim, Yuichi Sugai and Masanori Nakano, Experimental Analysis of Surface Tension Alteration by Salinity Change for Oil-Wet Rocks, 4th World Conference on Applied Sciences, Engineering & Technology, 2015.10.
4. Ronald Nguele, Kyuro Sasaki , Hikmat Said Al Salim, Yuichi Sugai and Masanori Nakano, Wettability Alteration in Berea Sandstone Cores by Contact Angle Measurements, Formation Evaluation Symposium of Japan, 2015.10.
5. Ronald Nguele, Kyuro Sasaki , Hikmat Said Al Salim and Yuichi Sugai,, Microemulsion Properties of Anionic Gemini Surfactants: Preliminary Screening for Enhanced Heavy Oil Recovery, European Colloid and Interface Society, 2018.03.
6. Ronald Nguele, Kyuro Sasaki , Yuichi Sugai, Hikmat Said-Al Salim and Ryo Ueda, Supercritical CO2 Injection in Heavy Oils – Solubility and Influence of Temperature in Asphaltene Deposition, World Heavy Oil Congress & Exhibition, 2016.09.
Membership in Academic Society
  • Society of Petroleum Engineers (SPE)