Inhibition of water-soluble cationic cellulosic polymers to clay hydration

The inhibition of water-soluble cationic graft terpolymers of hydroxyethylc ellulose with the vinyl monomers dimethyldiallylammonium chloride and acryl amide to the hydration of water-sensitive clay in oilfields was investigate d by clay hydration-swelling tests, XRD analyses, zeta-potential measuremen ts, and SEM observation. It has been shown that grafting enhances the hydra tion-inhibition effectiveness and the performances of these cationic cellul osic polymers are strongly dependent on their cationicity, relative molecul ar weight, and solution concentration. (C) 1999 John Wiley & Sons, Inc.