The shear thickening phenomenon of mobility control buffers in flow through porous media is adressed through the use of high molecular weight synthetic water-soluble polymers (W-SP) blended with carbohydrate W-SPs. This approach is necessary to separate shear and extensional reponses of thickened fluids under deformation. In previous studies in which the elastic contributions are an important part of the fluid response (i.e., where the dimensions of the fluid are approximate with the boundary conditions or the relaxation time of the fluid is approximate with the duration time of deformation) the shear viscosity response has been observed to contribute to the magnitude of the extensional response. The complementary interaction can be separated by employing blends of a flexible synthetic W-SP with carbohydrate polymers. In Berea core evaluation of such blends at practical frontal velocities the resistant factors observed were not proportional to the fluid's extensional viscosity. The permeabilities (160 mD) were only appproximate with the dimensions of the macromolecules and additional studies at lower permeabilities are in progress.

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