Effect of droplet deformability on shear thinning in a cylindrical channel

Silva, Danilo P. F.; Coelho, Rodrigo C. V.; Gama, M. M. Telo da; Araújo, Nuno A. M.

doi:10.1103/physreve.107.035106

Cited by 3 publications

(2 citation statements)

References 56 publications

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“…Using a higher order lattice for the streaming can help to reduce these velocities. 166 These velocities increase as the viscosity ratio deviates from unity or the surface tension increase. Proper and careful calibration of the G parameters is necessary otherwise the droplet may increase or decrease in size.…”

Section: Fluid–fluid Based Methodsmentioning

confidence: 99%

“…However, in 3D both lattices (D3Q41 and D3Q39) run over to the third belt of neighbours but on different lattice points which is sufficient to prevent droplet coalescence. 166 In the competing force F c k , the attractive force must overcome the repulsive force to stabilise droplets, so we set | G k ,1 | > | G k ,2 |. To obtain the desired repulsive and attractive forces: G k ,1 < 0, G k ,2 > 0, and G k , k̄ > 0.…”

Section: Fluid–fluid Based Methodsmentioning

confidence: 99%

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Lattice Boltzmann simulation of deformable fluid-filled bodies: progress and perspectives

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Section: Fluid–fluid Based Methodsmentioning

confidence: 99%

Section: Fluid–fluid Based Methodsmentioning

confidence: 99%

Lattice Boltzmann simulation of deformable fluid-filled bodies: progress and perspectives

Silva,

Coelho,

Pagonabarraga

et al. 2024

Soft Matter

Self Cite

View full text Add to dashboard Cite

show abstract

A comprehensive mathematical model for spontaneous imbibition in oil-saturated fractured tight sandstones: Incorporating fracture distribution, displacement pressure, gravity, and buoyancy effects

2023

Physics of Fluids

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This paper presents a generalized mathematical model that comprehensively characterizes the flow behavior of matrix nanopores and natural/hydraulic fractures in tight oil reservoirs during spontaneous imbibition. The model incorporates various influencing factors such as fracture distribution, displacement pressure gradient, gravity, and buoyancy. The complex pore structure of tight oil reservoirs, including nanopores and natural microfractures, presents a challenge in developing an accurate mathematical model for predicting flow behavior. The proposed model considers the fractal characteristics of pores and fractures and accounts for many factors to predict cumulative oil production, oil flow rate, and oil recovery factor during imbibition flow. Experimental data on fractured tight sandstones are used to validate the model, and sensitivity analyses are conducted to assess the influence of pore structure parameters, fracture distribution, and fluid properties on imbibition behavior. The findings reveal that gravity and buoyancy effects become more prominent under low interfacial tension. Fracture distribution significantly impacts imbibition behavior, with critical values for fractal dimensions, fracture numbers, and apertures determining the extent of their influence. Higher contact angles and increased oil phase viscosity result in reduced imbibition efficiency. In pressure-driven displacement processes, larger fractures preferentially produce crude oil, and the higher pressure gradients result in shorter imbibition processes. The proposed model offers insights into the imbibition oil recovery mechanism in tight oil reservoirs and can contribute to improved recovery factors.

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Investigation of microflow mechanisms and emulsion size distribution in porous media

Wang,

Wei,

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et al. 2023

Physics of Fluids

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Crude oil in underground porous media can be emulsified by surfactants, which can lead to improved oil recovery. However, there have been limited investigations revealing the interactions between emulsions and grains and comparing the influence of different factors on the distribution of emulsions in porous media at the pore scale. In this study, a solution containing surfactant was injected into an oil-saturated microchip with heterogeneous pore geometries. A series of tests were conducted by varying the injection rate, surfactant concentration, oil viscosity, and displacing phase viscosity. Qualitative analysis of flow mechanisms and quantitative analysis of the distribution of emulsions were performed through pore-scale snapshots. The results demonstrate that emulsions undergo deformation, breakup, and retention in porous media. Furthermore, new micro-interactions between emulsion droplets and grains are discovered, including the impact effect, cutting effect, and the synergy of both effects. A high flow rate of the displacing phase promotes the formation of more and smaller emulsions, while a low flow rate encourages flow diversion. An increase in oil viscosity and a decrease in surfactant concentration are not conducive to the formation of emulsions. However, an increase in the displacing phase viscosity promotes the formation of emulsions and flow diversion. The experiments provide detailed insights into the flow behaviors of emulsions at pore scale and offer valuable information for surfactant flooding.

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Effect of droplet deformability on shear thinning in a cylindrical channel

Cited by 3 publications

References 56 publications

Lattice Boltzmann simulation of deformable fluid-filled bodies: progress and perspectives

Lattice Boltzmann simulation of deformable fluid-filled bodies: progress and perspectives

A comprehensive mathematical model for spontaneous imbibition in oil-saturated fractured tight sandstones: Incorporating fracture distribution, displacement pressure, gravity, and buoyancy effects

Investigation of microflow mechanisms and emulsion size distribution in porous media

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