Device and method for measuring CO2-crude oil minimum miscible pressure

The invention relates to a device and a method for measuring CO2-crude oil minimum miscible pressure. The device comprises a microcapillary model, the microcapillary model is provided with a bottom plate and a cover plate which are made of high-temperature-resistant and high-pressure-resistant photoetching glass, a groove is etched in the bottom plate of the model, and an image matched with the shape of the horizontal section of the groove is printed on the cover plate of the model; an injection hole and an extraction hole are correspondingly formed in the head end and the tail end of the groove; according to the device, a microcapillary model, a gas-liquid separator, a gas chromatograph and the like are applied; the device is used for measuring the saturation pressure of a sample, the original dissolved gas-oil ratio, the molar fraction of each component and the molar fraction ratio of methane to high-carbon-number alkane in the removed gas; and carrying out a microcapillary displacement experiment to obtain