Determining the ability of in-situ CO2 to reduce oil's viscosity by the method of resistance coefficient

It is a new and effective technology to enhance oil recovery by using in-situ CO2 to reduce oil viscosity. The authors research the method to determine the oil viscosity reduction by using in-situ CO2, and bring forward the method of resistance coefficient. The evaluation is done to the single liquid system and dual liquids system of in-situ CO2 ability of reducing oil viscosity in the sand pack. The results indicate that the single liquid system can reduce the oil viscosity by 42.15%, and the dual-liquid system can reduce the oil viscosity by 52.69% when the oil viscosity is 12904.1 mPa · s, the temperature 70°C, the pressure 6 MPa. It shows the method of resistance coefficient to determine the degree of viscosity reduction is feasible and effective.