Determination of rheological parameters of rod-type bio-polymer (Xanthan) solutions as a single (mobile) phase in sand packs is discussed. In one series residual oil is present.

Apparent viscosities approximated from sand pack experiments could be described by a Carreau type of equation. Since no real in situ polymer solution viscosities and permeabilities to these solutions can be determined up to now a practical way out of this problem is the determination of mobilities to the polymer solution with the help of the Darcy equation. These polymer mobilities can be described with a modified Carreau type of equation.

RF, RRF values and polymer mobilities are discussed in the context of apparent polymer viscosities.

Up-front and residual polymer retention have been estimated for conditions of 100 % accessible porevolume.

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