The effect of slim tube physical parameters on carbon dioxide-hexane minimum miscibility pressure

While there are a number of techniques for determining the minimum miscibility pressure (MMP) of CO{dollar}sb2{dollar}/Oil systems, the slim tube apparatus remains one of the most popular tools in the petroleum industry.; In this work, the effects of various slim tube physical parameters on the MMP were evaluated. The physical parameters studied included tube diameter, tube length, and injection velocity. These led to other derived parameters that included length/diameter ratio (L/D) and residence time.; The results of the experiments showed that diameter was a statistically significant parameter, while length, injection velocity, L/D ratio, and residence time were statistically insignificant. The diameter effect was due, in part, to slightly different sand particle sizes in two of the tubes and also by the physical retention of the oil on the tube wall. Statistical analysis indicated that the MMP increased as the tube diameter decreased. As expected, MMP was also influenced by temperature.