A capillary flow model for filtration

Huang, Kaiwu; Pan, Liyang; Yoon, Roe‐Hoan

doi:10.1016/j.mineng.2017.10.012

Cited by 18 publications

(9 citation statements)

References 18 publications

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“…Capillarity is the spontaneous ability of a liquid to flow in confined spaces. While research in capillary flow began decades ago, it is still an increasingly important topic in natural and engineering phenomena such as geology, filtration, microfluidics, and medical diagnostics . Among the different parameters such as interfacial tension, pore sizes, and wettability known to affect capillary forces, wettability is the most critical one due to its complexity.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Capillary Filling Dynamics of Multicomponent Fluids in Straight and Periodically Constricted Microchannels

Keshmiri

Huang²,

Jemere

et al. 2020

Langmuir

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An extensive study of capillary flow of fluids with various viscosities in straight and periodically constricted microchannels with different surface wettability is presented. Capillary filling speed in hydrophilic, less hydrophilic, and hydrophobic microchannels were experimentally monitored and compared with the Washburn theoretical model. For all liquids, a linear relationship was found between the square of propagation distance and time, which is expected for Newtonian fluids. Experimental results indicated slower velocity compared to the theoretical prediction due to simplifications of the Washburn model. Capillary filling speed of fluids into long-fluororinated chain silane modified channels confirmed the expected lyophobic nature of the coating (i.e., not favorable for either hydrophilic or hydrophobic liquids). Presence of the precursor film ahead of the three-phase contact line in the microscopic level was demonstrated. White light and fluorescent images confirmed the presence of precursor film and capillary evaporation at the interface. Evaporation enhanced the deviation between experimental and theoretical results due to continuous wettability alteration of penetrating fluid.

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Section: Introductionmentioning

confidence: 99%

Investigation of Capillary Filling Dynamics of Multicomponent Fluids in Straight and Periodically Constricted Microchannels

Keshmiri

Huang²,

Jemere

et al. 2020

Langmuir

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“…When the rock is water-wet, there is a tendency for water to occupy the small pores and to contact the majority of the rock surface. Pure water does not penetrate spontaneously into a hydrophobic porous capillary, because if the contact angle is greater than π/2, it can only be forced to penetrate through. , The hydrophobic silica nanoparticles on the pore surface can prevent water from flowing into the pores, thereby effectively reducing the resistance of the water flow. However, the water permeability of the pore surface is greatly increased in association with the change of wettability upon the adsorption of hydrophobic silica nanoparticles thereon.…”

Section: Resultsmentioning

confidence: 99%

Hydrophobic Silica with Potential for Water-Injection Augmentation of a Low-Permeability Reservoir: Drag Reduction and Self-Cleaning Ability in Relation to Interfacial Interactions

et al. 2019

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An aqueous nanofluid containing superhydrophobic silica nanoparticles with a high surface activity and an average size of 7 nm was used to enhance the water injection of a low-permeability well. The mechanism for the aqueous nanofluid to enhance water injection was discussed. Findings indicate that the silica aqueous nanofluid can greatly increase the effective water permeability even after injecting water for 2100 pore volumes. This is because the hydrophobic silica nanoparticles can be well adsorbed onto the surface of the porous channels to cause hydrophilic to hydrophobic transformation. Both the hydrophobic capillary force and adhesion work contribute to increasing water injection; and in particular, there is a critical point in the pressure-permeability curves for the rock cores with different wettabilities. Only above the critical point, the hydrophobic rock core exhibits a higher effective water permeability than that of the hydrophilic one, which is imperative for drag reduction. Moreover, the hydrophobic rock core surface has a remarkable self-cleaning ability and can reduce the expansion ratio of clay and inhibit the formation of scale in association with the increase of effective porosity via decreasing the hydration film amount. This approach, highlighting the important role of wettability alteration in increasing water injection, could potentially promote the application of a silica aqueous nanofluid in enhanced oil recovery.

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“…Formation of the gel-like structure mentioned above makes dewatering difficult. On the other hand, the bitumen coating on the clay surfaces renders them partially hydrophobic, which intuitively should make dewatering of the oil sands tailings easier, as has been shown by Huang et al in a filtration process.…”

Section: Bitumen Coatingmentioning

confidence: 97%

“…13 In oil sands tailings management, the bitumen-coated clay particles are largely responsible for the formation of a stable gel-like structure, leading to poor dewatering and consolidation of oil sands mature fine tailings. 70 This was typically considered as the main reason why oil sands tailings are more difficult to dewater than most hard rock mine tailings. In this context, the bitumen coated-clay particles possibly play contradicting roles in oil sands tailings dewatering.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Bitumen Coating on Oil Sands Clay Minerals: A Review

Chen

Liu

2019

Energy Fuels

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Contamination of bitumen products by mineral solids is an intractable problem in the oil sands industry. Clay minerals with a bitumen coating, a major component of the mineral solids contaminants in bitumen, adversely affect bitumen production in multiple ways: hindering bitumen extraction, hindering dewatering of extraction tailings, stabilizing water-inbitumen emulsions, lowering the quality of bitumen, and so on. In this review, the recent progresses in understanding these bitumen-coated clay particles are summarized, particularly focusing on the spatial distribution of the bitumen coating on clay surfaces and the effect of such coating on clay behaviors. Here, "bitumen coating" is defined as all types of irreversibly adsorbed organic matter on oil sands clay minerals, including (but not limited to) asphaltenes and humic materials. The patchy nature of this bitumen coating has been proven and visualized in several recent works where different approaches have been used, including quantitative nanomechanical atomic force microscopy, total internal reflection fluorescence microscopy, and electron energy-loss spectroscopy. The presence of a bitumen coating makes the clay particles behave "actively" in bitumen production processes, causing the clays to migrate to bitumen products, i.e., water-extracted bitumen froth and solvent-extracted bitumen. The available methods for removal of fine mineral solids from the bitumen products are described. This review also brings forward the challenges and opportunities for future research regarding the characterization and handling of oil sands clay minerals.

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A capillary flow model for filtration

Cited by 18 publications

References 18 publications

Investigation of Capillary Filling Dynamics of Multicomponent Fluids in Straight and Periodically Constricted Microchannels

Investigation of Capillary Filling Dynamics of Multicomponent Fluids in Straight and Periodically Constricted Microchannels

Hydrophobic Silica with Potential for Water-Injection Augmentation of a Low-Permeability Reservoir: Drag Reduction and Self-Cleaning Ability in Relation to Interfacial Interactions

Bitumen Coating on Oil Sands Clay Minerals: A Review

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