Effect of oil composition on miscible-type displacement by carbon dioxide

The authors have found that the Holm-Josendal correlation, which is based on temperature and C/sub 5/+ molecular weight, predicts the general trend of the MMP's required for CO/sub 2/ flooding of various crude oils. MMP's were predicted with this correlation and then tested for several crude oils using oil recovery of 80% at CO/sub 2/ breakthrough and 94% ultimate recovery as the criteria. Data has been found showing that miscible-type displacement is also correlatable with the amount of C/sub 5/ through C/sub 30/ hydrocarbons present in the crude oil and with the solvency of the CO/sub 2/ as indicated by its density. Variations from such a correlation are shown to be related to the C/sub 5/ through C/sub 12/ content and to the type of these hydrocarbons. 13 refs.