To det. CO2 soly. and vol. expansion factor, a new method of measurement based on acoustics waves was proposed and math. calcns. were performed using Peng-Robinson equation of state. Measurements were carried out at 30 degrees C and under pressure of 2-6 MPa. The results were compared with the literature data, which allowed to validate the new measurement method. The obtained results clearly indicated the possibility of increasing the final crude oil recovery.