SUMMARY In this Part 2 paper on the initial laboratory study and development of polymer-enhanced foams (PEFs), the performance (effective viscosity and mobility control), propagation, and stability of relatively small (0.2 PV) PEF banks (slugs) were studied as they were flooded through long (20 ft), slim-tube-type, high-permeability sandpacks. The objective of this study was to investigate the performance of PEFs under more demanding experimental conditions than the laboratory studies reported in the Part 1 paper of this series. Another explicit goal of this work was to study the performance of PEFs in the presence of crude oil. Results of constant-differential-pressure flooding experiments, conducted at ambient conditions, showed that small (0.2 PV) PEF banks were propagated, were stable, and promoted relatively large effective viscosities and good mobility control during flow through the entire length of the 20-ft-long sandpacks. The high-permeability sandpacks were intended to be a one-dimensional model of a propped fracture. The standard PEF formulation of this study was shown, during these flooding experiments, to perform much better, to be much more propagatable, and to be much more stable than its counterpart conventional foam. The PEFs were also shown during these experiments to be much more stable and functional in the presence of the studied crude oils than their counterpart conventional foams. Aging in a sandpack for 20 days after the PEF bank had been initially injected had little impact on the performance, propagation, and stability of the standard PEF. The PEFs were shown during these flooding experiments to be able to effectively mobilize and recover crude oil, especially a viscous (440 cp) crude oil. Relatively good performance, propagation, and stability of PEF banks during these flooding experiments were observed for PEFs formulated with, respectively, carbon dioxide, nitrogen, and methane. Carbon dioxide PEFs were exceptionally effective at promoting large effective viscosities and good mobility control. In addition, they were especially effective at mobilizing and recovering crude oil. For the PEFs of this study, the minimum effective polymer and surfactant concentrations for effective performance in the presence of a crude oil were determined. Minimum polymer and surfactant concentrations required for effective performance were greater in the presence of crude oil, than in the absence of crude oil.