AbstractIn order to understand the molecular behavior of polymers during flow through porous media, five polymers with varying degree of amide‐carboxylate group ratio in partially hydrolyzed polyacrylamides were selcted, and the flow properties of their dilute solutions were measured in unconsolidated porous media. It has been found that adsorption of the polymers at the surface during flow, which plays an important role in permeability reduction, largely depends on the flexibility of the linear chains and electrostatic nature of the porous matrix. The flexibility of the chain is explained on the nature and ratio of groups attached on linearCCChains, e.g., varying degree of NH2and COOH groups in partially hydrolyzed polyacrylamides in the exp
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