Impact of polyacrylamide adsorption on flow through porous siliceous materials: State of the art, discussion and industrial concern

Abstract

The polymer affinity towards the silica surface depended on the density of hydroxyl groups at the surface of the oxide, its thermal treatment, storage condition and purity. This demonstrated that the impact of adsorption on acrylamide-based polymer flow within porous silicates heavily depends on the silicate surface composition and must be carefully evaluated. In view of the continually expanding use of acrylamide-based polymers, notably in enhanced oil recovery, such considerations provide interesting insights into the effect of adsorption on their flow into porous materials.

Near-surface rheology and hydrodynamic boundary condition of semi-dilute polymer solutions

“…3(c)), noting that the specific viscosity changes with the driving pressure. Scaled in this way, we find that all of the data collapse onto a single master curve that is well-described by linear power law in accordance with eqn (5). The prefactor is furthermore of order unity, indicating that the depletion layer thickness in these steady shear flows is approximately twice the scaling prediction for the depletion layer thickness at equilibrium, regardless of the shear rate and well into the shear-thinning regime.…”

“…1 In this model, three regions of increasing distance from the substrate are distinguished: the proximal, central and distal regions. The monomer density in the so-called proximal and central regions, fixing the adsorbed layer thickness, is shown to be independent of the bulk concentration and independent of the chain length as indicated by Bessaies-Bey et al 5 Such a result is in seeming contradiction with the molar mass dependence in Fig. 4.…”

“…ref. 5) or at the surface of colloids. [54][55][56] Additionally, it was predicted that such an adsorbed layer would impact the hydrodynamic boundary condition 57 in the way depicted in Fig.…”

“…Such structural effects can have major consequences on dynamics in confined systems. Adsorption leads to decreased permeability in porous media, which is a major issue in enhanced oil recovery; 5 depletion enhances flows via the formation of a low-viscosity lubrication layer close to the surface. 6,7 As will be studied here, polymer/surface interactions impact nanoscale flows by modifying the boundary condition for polymeric fluids, and non-trivial rheology also plays an important role.…”

Nanotechnology Application in Chemical Enhanced Oil Recovery: Current Opinion and Recent Advances

“…reduces the concentration of the injected chemical solutions. Adsorption is prevalent for surfactant and alkali chemicals, while polymer is mainly retained due to mechanical entrapment because of the size of the polymer macromolecules [3,18,20]. The adsorption process occurs when the interface is energetically favored by the surfactant and/or alkali in comparison to the bulk phase.…”