Effects of Substrate Hydrophobicity on Polyacrylamide Adsorption

Medjahed, Fatiha

doi:10.1006/jcis.1995.1125

Cited by 8 publications

(6 citation statements)

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“…The driving force for adsorption is therefore nonelectrostatic in origin, for the polymers are uncharged (shown by the absence of any H + and OH - consumption in potentiometric titrations). Broseta et al have also found that the adsorption of a nonionic polyacrylamide increases with surface hydrophobicity, which is in good agreement with this study. Nonelectrostatic interactions, primarily the hydrophobic interactions, have also been proposed to be the major driving force for the adsorption of polyacrylamides 10 and polysaccharides 8,12,15 onto a hydrophobic mineral.…”

Section: Resultssupporting

confidence: 92%

Morphology of Adsorbed Polymers and Solid Surface Wettability

et al. 2005

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The adsorption of a polyacrylamide (MW 14600) and two polysaccharides (MW 9260 and 706 x 10(3)) onto model silica surfaces of different hydrophobicities was investigated. In all cases, adsorption adhered to the Freundlich isotherm, reflecting the heterogeneous character of the solid substrates. The latter strongly influenced the character of the adsorbed polymer, with morphologies from chainlike structures to thin films and patches being observed. Surface roughness, polymer type, and molecular weight also play roles in controlling adsorbed polymer morphology. Surface wettability is strongly influenced by the thickness of the adsorbed layer.

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Section: Resultssupporting

confidence: 92%

Morphology of Adsorbed Polymers and Solid Surface Wettability

et al. 2005

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“…they govern the solvent quality and whether the polymer chain swells or shrinks. 47,48,51,53 Solvent quality is also a function of brine ionic charge and strength. 48,54−56 A low electrolyte (or brine) concentration enhances the repulsive charges between the monomers and therefore an anionic polymer swells and also reduces the anionic polymer/positively charged rock adsorption.…”

Section: Polymer Adsorptionmentioning

confidence: 99%

“…Polymers (as RPMs) should be nominated based on their ability to show strong attractive interactions with the rock surface to maximize adsorption, stability, and irreversibility. Rock–polymer interactions are (1) van der Waals interactions (dispersion), which are usually attractive and are governed by polymer structure/molecular weight, and (2) electrostatic interactions, which can be attractive or repulsive); these exist at the interfaces of rock/brine and brine/polymer. − The total interaction, i.e. the sum of van der Waals and electrostatic interactions (DLVO), is defined by the prevailing physicochemical conditions .…”

Section: Polymer Adsorptionmentioning

confidence: 99%

“…Both interactions (i.e., van der Waals and electrostatic interactions) also govern the interactions between polymer monomers (or in general fluid–fluid), i.e. they govern the solvent quality and whether the polymer chain swells or shrinks. ,,, Solvent quality is also a function of brine ionic charge and strength. ,− A low electrolyte (or brine) concentration enhances the repulsive charges between the monomers and therefore an anionic polymer swells and also reduces the anionic polymer/positively charged rock adsorption . On the other hand, if the electrolyte concentration increases (i.e., solvent quality is poorer), anionic polymers shrink/contract and increase the polymer–rock adsorption …”

Section: Polymer Adsorptionmentioning

confidence: 99%

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Rock/Fluid/Polymer Interaction Mechanisms: Implications for Water Shut-off Treatment

et al. 2021

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Several disproportionate permeability reduction (DPR) mechanisms have been proposed in the literature for water shutoff treatment using polymer relative permeability modifiers (RPM). However, none appear to be universally accepted. The lack of agreement may be because no single factor determines the success of DPR treatment. Moreover, there is still a lack of understanding of DPR mechanisms and the order of how these mechanisms work together. This paper provides a comprehensive review of the mechanisms behind the RPMs. We identify that sufficient polymer adsorption onto the rock surface is a primary condition for water shutoff treatment, while rock surface initial wettability and fluid−polymer−rock interaction/attraction plays a significant role in polymer adsorption. Furthermore, polymer concentration, polymer molecular weight, aging time, polymer injection volume, polymer injection rate, and reservoir temperature are also vital for polymer adsorption. After polymer adsorption, the mechanisms such as fluid segregation and wall effect help accomplish the required DPR. We also find that there is a more consistent agreement among the published studies on the order of DPR mechanisms e.g. initial rock wettability effect comes first, followed by initial segregation, adsorption wall effect (i.e., steric, lubrication, wettability alteration, and swelling/shrinkage), and then the final segregation. Depending on the RPM implementation, which depends on pore size, the polymer layer thickness can be adjusted after the placement permanently or temporarily by controlling swelling/shrinkage. The subject matter investigated in this review helps us understand the factors responsible for optimal performance of polymer solutions in controlling excess water production from hydrocarbon reservoirsthus assisting in more efficient oil/gas production.

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“…Sohrabi et al 36 have also studied water alternating gas injection using high pressure micromodels in both oil-wet and mixed-wet systems. Polymer flooding in glass micromodels 37,38 has been studied as well, and Meybodi et al, 39 Jamaloei and Kharrat [40][41][42] have performed detailed investigations of displacement behaviors in this context. Perrin et al 43 have even investigated the quantitative information of the velocity field inside such pore network micromodels using micro-PIV (particle image velocimetry).…”

Section: Introductionmentioning

confidence: 99%