DEVELOPMENT OF MISCIBILITY IN 4-COMPONENT CO2 FLOODS

A rigorous tie-line extension criterion for the minimum miscibility pr essure (MMP) is derived for dispersion-free, 1D displacements in four- component systems in which CO2 displaces oil containing dissolved meth ane. The key tie-lines required for application of the MMP criterion a re obtained by a simple graphical construction. A simplified technique for construction of solutions is demonstrated for the CO2/methane/but ane/decane system. The new technique makes solution of certain four-co mponent problems not much more difficult than solution of a Buckley-Le verett displacement of oil by water.