Single long sand pack experiment indicated injecting foamer and nitrogen alternately could form fine and smooth foam at front end face of core.

Using the sand pack model, the percolation features of low permeability cores with various clay minerals and different proportions of clays are studied under different fluid injection patterns.

Fearing that their vacations could comprise of surf, sand and swine flu, potential travelers are turning to health organizations for guidance on whether to pack their bags or stay home.