![]() The optimal exponents in binary interaction parameter (BIP) correlations are obtained by best matching the measured saturation pressures. The heavy oil which is a complex mixture with unknown molecular structure is characterized as six pseudocomponents by using an exponential distribution splitting function and a logarithm-type lumping method. Theoretically, the volume-translated Peng-Robinson equation of state (PR EOS) coupled with a recently modified alpha function is applied as the primary thermodynamic model to reproduce the experimental measurements. A pressure-volume-temperature (PVT) setup is used to measure vapor-liquid phase boundaries (i.e., saturation pressures) and swelling factors at high pressures up to 11.1 MPa and elevated temperatures up to 373.35 K. Experimentally, a pure substance of CO 2 and a gas mixture consisting of 27.7 mol% C 3H 8, 23.9 mol% n-C 4H 10, and 48.4 mol% CO 2 are respectively introduced to dilute the highly viscous heavy oil. ![]() Techniques have been developed to determine vapor-liquid phase boundaries and swelling factors of CO 2-heavy oil systems and C 3H 8- n-C 4H 10-CO 2-heavy oil systems under reservoir conditions. ![]()
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