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Numerical modelling of the effect of wettability, interfacial tension and temperature on oil recovery at pore-scale level.

Iyi, Draco; Balogun, Yakubu; Oyeneyin, Babs; Faisal, Nadimul

Authors

Draco Iyi

Yakubu Balogun

Babs Oyeneyin



Abstract

A numerical investigation into the effect of wettability and temperature on oil recovery with a hot water injection at different temperatures is reported in this paper. The computational domain is a two-dimensional porous medium (reservoir) maintained at a fixed temperature with pore spaces of varying sizes and interconnected pore-throats. ANSYS-Fluent VOF (volume of fluid) model was used to simulate the two-phase transport through the reservoir with hot water injections at varying temperatures (20, 40 and 60 oC) and wettability contact angles of 45o, 90o and 150o. In addition, an investigation was conducted on the effect of combined interfacial tension and matrix wettability on oil recovery process at low and high interfacial tension of 0.025 N/m and 0.045 N/m respectively for the three different wettability contact angles. The results showed that, the displacement behaviour of water and oil-wet system is affected significantly by the contact angle with a profound effect on the oil recovery factor. In the water-wet case (with the water wetting the matrix wall and the oil phase surrounded by water), relatively more oil is displaced from the domain thereby improving the oil recovery factor. The water-wetter system resulted in about 35-45% oil recovery than the oil-wet system, with the unrecovered oil mainly adhering to the wall region of the pore bodies for oil-wet system. For the intermediate wet case, initial fluid distribution is seen to have a more significant effect on the displacement behaviour than the contact angles. In conclusion, by altering the wettability from oil-wet to water-wet condition, the oil recovery rate is improved. The results from this study are consistent with the experimental and numerical studies in literature and it will further enhance the understanding of the phenomenon that is critical to the mechanism of recovery such as surfactant and polymer flooding process.

Citation

IYI, D., BALOGUN, Y., OYENEYIN, B. and FAISAL, N. 2021. Numerical modelling of the effect of wettability, interfacial tension and temperature on oil recovery at pore-scale level. Journal of petroleum science and engineering [online], 201, article ID 108453. Available from: https://doi.org/10.1016/j.petrol.2021.108453

Journal Article Type Article
Acceptance Date Jan 21, 2021
Online Publication Date Feb 4, 2021
Publication Date Jun 30, 2021
Deposit Date Feb 11, 2021
Publicly Available Date Feb 5, 2022
Journal Journal of petroleum science and engineering
Print ISSN 0920-4105
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 201
Article Number 108453
DOI https://doi.org/10.1016/j.petrol.2021.108453
Keywords Oil recovery; Wettability; Interfacial tension; Temperature; Contact angle; Computational fluid dynamics
Public URL https://rgu-repository.worktribe.com/output/1187381