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Ten to possibly thousand fold ratios of horizontal permeability to vertical permeability are required in two nclean" sand reservoirs to match actual water-free production of oil and. gas of wells having bottom water. Layer models with average permeabilities of cores at similar stratigraphic position in the reservoir rather than values selected from the. permeability frequency distribution and with highly restricted cross flow yield the best match between actual and calculated dilution of wet gas by injected gas in two cycling projects. These same reservoir modeling concepts yield reasonable agreement with actual performance of the ~eeligson enriched gas drive test without assumption of serious viscous fingering with gravity segregation.