Solution and adsorption properties of hydrophobically associating water-soluble polyacrylamides

Hydrophobically Modified Sulfonated Polyacrylamides for IOR: Correlations between Associative Behavior and Injectivity in the Diluted Regime

“…Regarding HMWSP flow in porous media, much fewer references can be found, but the available results [49,50] indicate significantly higher injection pressures for HMWSP than for corresponding WSP, which are attributed to higher adsorption for HMWSP. Such interpretations are consistent with HMWSP adsorption studies performed under static conditions, which have shown that adsorption isotherms do not tend to a plateau when increasing polymer concentration [51][52][53]. These results are classically interpreted by the formation of multilayers of adsorbed HMWSP due to hydrophobic interchain interactions.…”

“…As classically stated [67], for a given M W , the intrinsic viscosity can be considered as proportional to the reciprocal of a "density in solution" of the polymers: the lesser [η], the "denser", or the less swelled the polymers are. Lower [η] for HMWSP as compared to WSP are often reported [7,68] and attributed to the formation of intrachain bonds between hydrophobic units. Accordingly, our results suggest the presence of intrachain bonds in I20C8-0.5 solutions.…”

“…Manifestly, the first two mechanisms can lead to the formation of a filter-cake of polymer physical gel on the membrane surface. For HMWSP filtration, adsorption can also eventually entail filter-cake build-up, since it can involve multilayer adsorption through the formation of hydrophobic bonds between adsorbed chains [51].…”

Hydrophobically Associating Polymers As Rheology Modifiers

“…The rheological properties of such systems depend much on the adsorption properties of hydrophobically associating macromolecules on solid surfaces. Adsorption properties have been shown to be influenced by the associative character of polymer: the existence of non-classical multiple layers through hydrophobic associations has been proposed as possible mechanism [10]. Much work remains to be done in that field to precise the adsoption mechanism.…”

Use of Polymers to Recover Viscous Oil From Unconventional Reservoirs

“…With such short cores (and no internal pressure taps), resistance factors that appear high may simply reflect plugging. Argillier et al (1996) and Volpert et al (1997) concluded that hydrophobically associative polymers show multilayer adsorption on clays and siliceous minerals. Consistent with this finding, Maia et al (2009) observed that resistance factors for an associative polymer increased continuously with increased throughput in sandstone cores.…”