A new insight into the dependence of relaxation time on frequency in viscoelastic surfactant solutions: From experimental to modeling study

García, Brayan F.; Saraji, Soheil

doi:10.1016/j.jcis.2018.01.078

Cited by 33 publications

(12 citation statements)

References 72 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This decay is typical of viscoelastic solutions that follow the Arrhenius theory. 27 From eq 4, we extract the effect of temperature T on the relaxation time λ by calculating the relaxation activation energy E a . Here, A is a pre-exponential factor and R is the gas constant.…”

Section: ■ Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Higher Salt Hydrophobicity Lengthens Ionic Wormlike Micelles and Stabilizes Them upon Heating

et al. 2020

View full text Add to dashboard Cite

Tuning the rheological properties of surfactant solutions by charge screening is a convenient formulation tool in cosmetic, household, oil recovery, drag-reduction, and thickening applications. Surfactants self-assemble in water, and upon charge screening and core shielding, they grow into long wormlike micelles (WLMs). These are valuable model systems for soft matter physics, and the most explored formulation is hexadecyl-trimethylammonium bromide (CTAB) and sodium salicylate (NaSal). Replacing NaSal with aromatic salts of altered hydrophobicity results in different penetration of the additive in the CTAB micellar core. This altered penetration depth will determine the anisotropic micellar growth that tailors the viscoelastic response. Sodium 4-methylsalicylate (mNaSal) is a higher hydrophobicity alternative to NaSal, requiring less additive to induce strong changes in the viscoelastic properties. Herein, we provide a comparative study of the mNaSal/CTAB system with the reference NaSal/CTAB over a range of temperatures and salt concentrations. The findings from the well-known NaSal/CTAB pair are transferred to the mNaSal/CTAB system, revealing the origins of the WLM solution’s viscoelastic properties by discerning contributions from charge screening and micellar core shielding upon small differences in hydrophobicity.

show abstract

Section: ■ Resultsmentioning

confidence: 99%

“…The relaxation time has a monoexponential decay with temperature for both salt additives. This decay is typical of viscoelastic solutions that follow the Arrhenius theory . From eq , we extract the effect of temperature T on the relaxation time λ by calculating the relaxation activation energy E a .…”

Section: Resultsmentioning

confidence: 99%

Higher Salt Hydrophobicity Lengthens Ionic Wormlike Micelles and Stabilizes Them upon Heating

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Raghavan and Douglas [58] conjectured that EDAB form stiff, long wormlike micelles which result in very long relaxation times in the linear viscoelastic regime, which is in contrast to a typical Maxwell viscoelastic fluid typical of most surfactant solutions, e.g. [55,73]. Gupta et al [21] also provided cryo-TEM images for the VES solutions (albeit in higher concentrations than the ones used in the present study), which show evidence of an entangled network of wormlike micelles longer than 1 µm, but without the cross links typically seen in Carbopol dispersions.…”

Section: Ves Solutionsmentioning

confidence: 99%

Turbulent drag reduction of viscoelastic wormlike micellar gels

Mitishita¹,

Elfring²,

Frigaard³

2021

Preprint

View full text Add to dashboard Cite

Long-chained, viscoelastic surfactant solutions (VES) have been widely employed in the oil and gas industry, particularly in hydraulic fracturing and gravel-packing operations, where turbulence is commonly reached due to high pumping rates. With this motivation, we experimentally investigate the turbulent duct flow of an under-studied class of wormlike micellar solutions that forms a gel at room temperature. The fluid is characterized via rotational rheometry, and the turbulent velocity and Reynolds stress profiles are measured via Laser Doppler Anemometry (LDA). Three surfactant concentrations are investigated at increasing Reynolds numbers. The turbulent flow fields of water, and semi-dilute solutions of partially hydrolyzed polyacrylamide (HPAM) and xanthan gum (XG) are used as comparisons. Our study reveals that the gel-like structure of the wormlike micellar gel is mostly broken down during turbulent flow, especially in the near-wall region where the results indicate the presence of a water layer. Turbulent flow at low concentrations of surfactant show a Newtonian-like flow field throughout most of the duct, where the energy spectra shows a −5/3 power law scale with wavenumber, whereas higher concentrations lead to drag reduction and lower power spectral densities at large wavenumbers. A comparison of the flow of polymeric fluids and the wormlike micellar solutions at maximum drag reduction (MDR) shows comparable drag-reduction effects, with a large decrease in Reynolds shear stresses, and increased turbulence anisotropy in the buffer layer due to the large streamwise fluctuations and near-zero wall-normal fluctuations. At the centreline of the duct, the power spectral densities of polymers and VES are significantly reduced at all wavenumbers probed. Additionally, the MDR regime was bounded by Virk's asymptote for both polymers and the micellar gel, which implies a similar mechanism of drag reduction at MDR.

show abstract

“…Due to the high viscosity loss of polymer under high‐temperature and high‐salinity conditions, the application of chemical flooding is restricted in high‐temperature and high‐salinity reservoirs. In recent years, surfactants with high‐temperature and high‐salt resistances, such as sulfonate surfactants and ethoxylated amine surfactants, have been developed, making it possible to provide a solution for high‐temperature and high‐salinity reservoirs. However, the greatest disadvantage of surfactant flooding is that it has unfavorable mobility control, and the surfactant solution easily flows rapidly along the high‐permeability oil layer.…”

Section: Introductionmentioning

confidence: 99%

A comprehensive review of emulsion and its field application for enhanced oil recovery

Yazhou

Yin

Chen

et al. 2019

Energy Science & Engineering

112

View full text Add to dashboard Cite

Emulsification plays an important role in enhancing oil recovery. Experiments and field applications of alkali/surfactant/polymer (ASP) flooding indicated that the amount of oil recovery in liquids with emulsions is 5% higher than that in liquids with no emulsions. Therefore, it is of great significance to study emulsion and its field application for enhanced oil recovery. This paper discusses the current status of emulsion for enhanced oil recovery, including the formation mechanism of emulsions in chemical flooding, rheological properties, stability, seepage characteristics, emulsion improving sweep volume, and displacement efficiency, along with future development plans of emulsion for enhanced oil recovery, especially surfactants for chemical flooding. In addition, the Pickering emulsion for application in enhanced oil recovery is also discussed. The development effects of emulsion flooding have been discussed for the Midway‐Sunset Oilfield, the emulsification characteristics of ASP flooding have been analyzed in Xing‐V and Xing‐II of the Daqing Oilfield, and the experiences regarding emulsion for enhanced oil recovery have been summarized. The key research directions of emulsion for enhanced oil recovery are indicated.

show abstract

A new insight into the dependence of relaxation time on frequency in viscoelastic surfactant solutions: From experimental to modeling study

Cited by 33 publications

References 72 publications

Higher Salt Hydrophobicity Lengthens Ionic Wormlike Micelles and Stabilizes Them upon Heating

Higher Salt Hydrophobicity Lengthens Ionic Wormlike Micelles and Stabilizes Them upon Heating

Turbulent drag reduction of viscoelastic wormlike micellar gels

A comprehensive review of emulsion and its field application for enhanced oil recovery

Contact Info

Product

Resources

About