The US Department of Energy's (DOE) Morgantown Energy Technology Center (METC) is investigating methods to control the mobility of carbon dioxide for use in gas miscible displacements of hydrocarbons that are found in petroleum reservoirs. Carbon dioxide is an excellent hydrocarbon recovery agent, recovering nearly 100% of the oil that it contacts. Like other gases, carbon dioxide has a relatively low viscosity, even at elevated pressures, that contributes to its high fluid mobility. Thus, carbon dioxide channels through high permeability strata, bypasses much of the oil in place, and experiences premature breakthrough at producing wells. The use of foam (a dispersion or an emulsion) is one mobility control method that DOE/METC is investigating. Large-scale natural sandstone cores are being flooded with carbon dioxide dispersions to evaluate the dispersions'worth as displacing fluids. The following are specific objectives of the laboratory investigations: (1) evaluate displacement test results using analytical methods, (2) provide mathematical simulator input data, (3) verify mathematical compositional simulator results, and (4) further understand the viability of using foams as displacing fluids in crude oil reservoirs. A summary of literature concerning the properties of carbon dioxide, the application of carbon dioxide in enhanced oil recovery operations, and the fundamental flow behavior of dispersions is reported here. The literature review facilitated bench-scale displacement tests at DOE/METC that use carbon dioxide dispersions to improve the efficiency of gas miscible flooding. Additionally, preliminary two-dimensional carbon dioxide and carbon dioxide dispersion tests are reported. Results of the tests clearly show that the displacing fluid mobility was reduced when a dispersion was employed. 28 refs., 21 figs., 2 tabs.