Blocking or reducing water production from oil wells has to be considered as a serious problem in oil industry. In order to reduce the water relative permeability in the reservoir, there is the possibility of envisaging polymer flooding. Moreover and, owing to the phenomenon of adsorption of polymers on the rock surface, the existing heterogeneities within the reservoir can be reduced. In this study, two types of polymers namely; polyacrylamide (PAA) and polysaccharides (xanthan) have been investigated. The viscosity of both polymer solutions was first evaluated based on different salinities, shear rates and concentrations. The prepared solutions were then injected into core samples. Such process was aimed to examine the adsorption on rock surface by calculating the resistance factor as well as the residual resistance factor. Moreover, the effect of the injection rate of polymer solution has also been studied. As a result, it has been found that xanthan solution is tolerant of high salinity (20%), while PAA-solution is very sensitive to salt. Furthermore, such statement matches also the temperature which can reach till 60°C. It is also found that the lower the injection rate the higher is the adsorption on rock surface. Therefore, xanthan can be recommended to water shut off in high salinity and high temperature reservoirs.

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