Investigation on bubble snap-off in 3-D pore-throat micro-structures

Wu, Yining; Fang, Sisi; Dai, Caili; Sun, Yongpeng; You, Qing; Liu, Yifei; He, Long

doi:10.1016/j.jiec.2017.05.019

Cited by 37 publications

(9 citation statements)

References 27 publications

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“…The bubble pinching off driven by the surface tension took less time in the DTAB–NPs system. The bubble breakup in the DTAB–NPs system consumed a shorter time and generated smaller daughter bubbles, which is also in accord with our previous work . A smaller bubble size for the DTAB–NPs system means a greater surface area, which results in higher energy consumption in sand packs.…”

Section: Resultssupporting

confidence: 90%

“…The bubble breakup in the DTAB−NPs system consumed a shorter time and generated smaller daughter bubbles, which is also in accord with our previous work. 45 A smaller bubble size for the DTAB−NPs system means a greater surface area, which results in higher energy consumption in sand packs. This also partially explained why the pressure drop across the sand packs is higher for the DTAB−NPs system in the injection stage.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Stability Mechanism of Nitrogen Foam in Porous Media with Silica Nanoparticles Modified by Cationic Surfactants

Fang

Zhang

et al. 2018

Langmuir

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This work aims at studying the effect of electrostatic interactions between cationic surfactants and silica nanoparticles (NPs) on foam stability in porous media. The physio-chemical property of NPs, the gas-liquid interface properties, the foam flow characteristics, together with the stability under different concentrations of surfactant and NPs were investigated and compared. It was found that the affinity of silica NPs to the surface is tunable by variation of surfactant concentrations. NPs and surfactants as a whole assembling at the surface substantially improve the foam stability in static and dynamic tests. These surfactant-modified NPs accumulate at the bubble surface and remain stable under dilution of brine, providing a barrier effectively preventing coalescence. In addition, foam stability is enhanced since the layer of NPs significantly reduces the mass transfer rate, consequently mitigating the Ostwald ripening.

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Section: Resultssupporting

confidence: 90%

Section: ■ Results and Discussionmentioning

confidence: 99%

Stability Mechanism of Nitrogen Foam in Porous Media with Silica Nanoparticles Modified by Cationic Surfactants

Fang

Zhang

et al. 2018

Langmuir

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“…Here, a facile and scalable method based on microfluidic technology − to precisely manipulate bubble shape is first proposed. Using the microfluidic device (SI Figure S1a), bubbles with narrow size distributions were generated.…”

Section: Resultsmentioning

confidence: 99%

Precisely Tailoring Bubble Morphology in Microchannel by Nanoparticles Self-assembly

Wang

Dai

et al. 2019

Ind. Eng. Chem. Res.

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Precisely tailoring bubble morphology is always a long-standing great challenge. In this work, a facile and scalable method to generate nonspherical bubbles with long-term stability is proposed. Taking advantage of the electrostatic interaction between silica nanoparticles (SNPs) and cationic surfactants, the SNPs are decorated with surfactants and endowed with interfacial activity. Due to the rearrangement of surfactants, the decorated SNPs transform to a kind of Janus particles at the gas−liquid interface. By precisely manipulating the surface activity, packing density, and jamming of Janus SNPs at the bubble surface, four different shapes such as oblaten-like, bullet-like, tadpole-like, and worm-like bubble were obtained continuously in the microchannel. Herein, our method to generate bubbles with a prescribed shape poses opportunities for gas microreactor, cavity material, gas storage, and provide a platform to study the applicable scope of the Young−Laplace equation.

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“…Since the 1990s, foams have been widely used as diverting agents in gravel-packed wells in formations with permeabilities lower than 1.5 μm 2 . , In field applications, nitrogen compressors must be used, and the foaming property is easily affected by acidizing additives. , Most chemical methods use surfactants to generate a gel as the blocking agent underground to complete acid diversion, , but gel-blocking agents are difficult to remove after solidification, causing permanent blockage of channels at high temperatures. − …”

Section: Introductionmentioning

confidence: 99%

Emulsion Acid Diversion Agents for Oil Wells Containing Bottom Water with High Temperature and High Salinity

Sun

Liu

et al. 2020

ACS Omega

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Conventional acid diversion agents cannot tolerate the high temperature and salinity of acidizing water-producing oil wells that contain bottom water and heterogeneous layers. Therefore, a water/oil (w/o) emulsion was proposed as an acid diversion agent to promote acidification. The selected emulsifier, oleic acid imidazoline, is a switchable emulsifier. Because this emulsifier reacts with acids to transform amines into ammonium, the emulsion rapidly demulsifies, and the emulsion acid diversion agent can use the spent acid flowback to remove plugging. Evaluation of the emulsion properties indicated that a 10 wt % emulsifier generated a stable emulsion at oil/water ratios from 1:9 to 4:6 at 90 °C. Viscosity was higher at lower oil/water ratios, and the emulsion with an oil/water ratio of 4:6, which had a low viscosity, was injected into the formation. During injection, the emulsion continued to emulsify in high-permeability channels, which increased the viscosity until the water layer was blocked. During experiments, single-tube and dual-tube models were designed to evaluate the injectivity and plugging selectivity of this emulsion. The results showed that the resistance factors exceeded 14 in the high-permeability cores when the emulsion was injected. The higher permeability ratio in parallel cores allowed a larger emulsion volume to enter the high-permeability cores. In experiments using parallel cores, the block rate of the high-permeability cores exceeded 92%, and that of the low-permeability cores was less than 12%. Finally, this emulsion was injected into two groups of parallel carbonate cores for acidification diversion tests. The results indicated that the permeability of the acidified low-permeability core was basically the same as that of the high-permeability core plugged by the emulsion. The findings of this study improve the understanding of the feasibility and advantages of using emulsions as acid diversion agents for high-temperature and high-salinity oil wells containing bottom water.

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Investigation on bubble snap-off in 3-D pore-throat micro-structures

Cited by 37 publications

References 27 publications

Stability Mechanism of Nitrogen Foam in Porous Media with Silica Nanoparticles Modified by Cationic Surfactants

Stability Mechanism of Nitrogen Foam in Porous Media with Silica Nanoparticles Modified by Cationic Surfactants

Precisely Tailoring Bubble Morphology in Microchannel by Nanoparticles Self-assembly

Emulsion Acid Diversion Agents for Oil Wells Containing Bottom Water with High Temperature and High Salinity

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