The transport of sand particles by water into casing perforations was studied using large experimental equipment. Variables included particle size and shape, size distribution, solids concentration, flow rate, perforation patterns,and perforation size. Increases in flow rate and sphericity had a favorable effect on transport, whereas increases in solids concentration and particle size were detrimental. Other variables had little effect on the transport process. Size classification of mixtures was also noted in perforated intervals.