Solubility of CO₂ in crude oil and high-salinity formation water under high temperature and high pressure: Taking the Triassic reservoirs in a certain area of Tahe oilfield as an example

The solubility of CO₂ in the presence of high-salinity formation water, crude oil and unsaturated oil-water system was tested at 110℃ and 50 MPa by using a self-developed high temperature and high pressure CO₂ solubility measurement device. The experimental results showed that the formation water dissolved carbon dioxide gas amount of 26.5 m³/m³, and that of compound crude oil was about 134 m³/m³. When the oil/water volume ratio was 1:1, the partition coefficient of injected CO₂ in oil and water was about 9.23.