Salt type and concentration affect the viscoelasticity of polyelectrolyte solutions

Turkoz, Emre; Perazzo, Antonio; Arnold, Craig B.; Stone, Howard A.

doi:10.1063/1.5026573

Cited by 33 publications

(27 citation statements)

References 41 publications

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“…[57] For polyelectrolytes, the extensional viscosity can also depend sensitively on salt concentration, the valency of the salt ions, and the particular cations and anions that associate with the chain. [58][59][60] Measuring these effects can be challenging, however: most rheometers inherently have shear, making it difficult to differentiate the role of non-Newtonian shear and extensional viscosity. Extensional viscosity can be estimated using opposing jet flow, but it is again difficult to remove the effects of shear.…”

Section: Shear and Extensional Viscositymentioning

confidence: 99%

Pore‐Scale Flow Characterization of Polymer Solutions in Microfluidic Porous Media

Browne

Shih

Datta

2019

Small

101

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Polymer solutions are frequently used in enhanced oil recovery and groundwater remediation to improve the recovery of trapped nonaqueous fluids. However, applications are limited by an incomplete understanding of the flow in porous media. The tortuous pore structure imposes both shear and extension, which elongates polymers; moreover, the flow is often at large Weissenberg numbers, Wi, at which polymer elasticity in turn strongly alters the flow. This dynamic elongation can even produce flow instabilities with strong spatial and temporal fluctuations despite the low Reynolds number, Re. Unfortunately, macroscopic approaches are limited in their ability to characterize the pore‐scale flow. Thus, understanding how polymer conformations, flow dynamics, and pore geometry together determine these nontrivial flow patterns and impact macroscopic transport remains an outstanding challenge. This review describes how microfluidic tools can shed light on the physics underlying the flow of polymer solutions in porous media at high Wi and low Re. Specifically, microfluidic studies elucidate how steady and unsteady flow behavior depends on pore geometry and solution properties, and how polymer‐induced effects impact nonaqueous fluid recovery. This work thus provides new insights for polymer dynamics, non‐Newtonian fluid mechanics, and applications such as enhanced oil recovery and groundwater remediation.

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Section: Shear and Extensional Viscositymentioning

confidence: 99%

Pore‐Scale Flow Characterization of Polymer Solutions in Microfluidic Porous Media

Browne

Shih

Datta

2019

Small

101

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“…In summary, the above-described phenomena are responsible for the difference in the particle network formed in presence of K + and Na + , and its mechanical resistance against loading. Some recent advances in the customization of non-Newtonian fluids also suggest manipulation of the salt type and concentration as a mean of control of viscoelastic properties of polyelectrolyte solutions [54].…”

Section: Discussionmentioning

confidence: 99%

Dynamic Behavior of Dilute Bentonite Suspensions under Different Chemical Conditions Studied via Magnetic Resonance Imaging Velocimetry

Chernoburova

Jenny

Richter

et al. 2018

Colloids and Interfaces

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This study investigates dilute aqueous suspensions of bentonite particles using magnetic resonance imaging (MRI) velocimetry. Four different chemical conditions are tested to investigate the influence of pH and type of monovalent electrolyte on the local rheological behavior of bentonite suspensions. The results indicate the shear banding in a dilute suspension of 0.1 vol.% solid due to the formation of a continuous three-dimensional particle network under a certain chemical environment (i.e., pH 4 in 1 × 10 −2 M KNO 3 ). This network is responsible for the existence of the yield stress in that dilute suspension. Structural changes induced by modification of suspensions' chemistry are examined via scanning electron microscopy. A previously established method based on processing the torques acquired via conventional rheometric measurement is also applied as an alternative way to recover local flow information. Within the shear rate range covered by our MRI velocimetry, the results of both methods show good agreement. This study suggests that the existence of a master curve (or global flow curve) for dilute suspensions is dependent on the bentonite particle organization, which is influenced by the suspension chemistry and the previous flow history.

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“…A big disadvantage of viscoelastic HPAM polymers is their sensitivity to salinity of the solution which is reflected as a decreased viscosity and relaxation time [ 10 , 18 , 108 , 109 , 110 , 111 ]. Abidin et al [ 18 ] studied that the main reason behind the decrease of relaxation time and viscosity of HPAM polymers in high-salinity environments are the divalent cations that connect to the acrylate parts of the polymer chains.…”

Section: Viscoelasticity In Enhanced Oil Recoverymentioning

confidence: 99%

“…In contrast to this, most of the literature as presented for example in Turkoz et al [ 109 ] assumes that the charge-screening effect is the main driver of relaxation time reduction and therefore, it only depends on salt concentration. The charge-screening mechanism is described by Sasaki [ 112 ] as the effect of external charges (cations of the salt) partially bonding to the molecule which are then screened by internal electrons.…”

Section: Viscoelasticity In Enhanced Oil Recoverymentioning

confidence: 99%

On the Role of Polymer Viscoelasticity in Enhanced Oil Recovery: Extensive Laboratory Data and Review

et al. 2020

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Polymer flooding most commonly uses partially hydrolyzed polyacrylamides (HPAM) injected to increase the declining oil production from mature fields. Apart from the improved mobility ratio, also the viscoelasticity-associated flow effects yield additional oil recovery. Viscoelasticity is defined as the ability of particular polymer solutions to behave as a solid and liquid simultaneously if certain flow conditions, e.g., shear rates, are present. The viscoelasticity related flow phenomena as well as their recovery mechanisms are not fully understood and, hence, require additional and more advanced research. Whereas literature reasonably agreed on the presence of these viscoelastic flow effects in porous media, there is a significant lack and discord regarding the viscoelasticity effects in oil recovery. This work combines the information encountered in the literature, private reports and field applications. Self-gathered laboratory data is used in this work to support or refuse observations. An extensive review is generated by combining experimental observations and field applications with critical insights of the authors. The focus of the work is to understand and clarify the claims associated with polymer viscoelasticity in oil recovery by improvement of sweep efficiency, oil ganglia mobilization by flow instabilities, among others.

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Salt type and concentration affect the viscoelasticity of polyelectrolyte solutions

Cited by 33 publications

References 41 publications

Pore‐Scale Flow Characterization of Polymer Solutions in Microfluidic Porous Media

Pore‐Scale Flow Characterization of Polymer Solutions in Microfluidic Porous Media

Dynamic Behavior of Dilute Bentonite Suspensions under Different Chemical Conditions Studied via Magnetic Resonance Imaging Velocimetry

On the Role of Polymer Viscoelasticity in Enhanced Oil Recovery: Extensive Laboratory Data and Review

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