This paper presents results from a series of single phase stable displacement experiments in a heterogeneous core assembly. This system consists of a 0.5 m cylindrical sandstone core with a central core removed and replaced with high permeability ballotini. Displacements at unit, 2:1 and 10:1 viscosity ratio were performed which demonstrated the importance of crossflow mechanisms in polymer flooding processes.

The experiments were modelled using a curvilinear grid in a chemical flood simulator. All of the main features observed in these experiments were successfully reproduced and analysed in terms of viscous and dispersive crossflow effects. Some discussion is presented on the significance of crossflow at the reservoir scale.

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