为了优选CO2与原油间最小混相压力的测量方法，对两种不同的实验方法进行了比较分析。采用界面张力法和细长管实验法测量模拟地层温度为108 ℃，地层压力为24～40 MPa条件下的CO2与原油间的最小混相压力。实验发现，界面张力随压力的增加近乎呈线性下降。利用悬滴法测得的最小混相压力为38.094 MPa，利用细长管实验法测得的最小混相压力为39.2 MPa，两者与通过线性回归外推法得到的最小混相压力38.715 MPa相比，相对误差分别为1.60 %和1.25 %。通过比较，细长管实验法的精确度更好。

 To optimize method for measuring the minimum miscibility pressure of CO■ and crude oil， comparative analysis is conducted on two experiment methods. Applied are interfacial tension method and slender tube method in simulated conditions of formation temperature108℃and formation pressure from 24 to 40 MPa to measure the minimum miscibility pressure of CO2 and crude oil. It is found that the interfacial tension drops almost linearly as pressure increases. The minimum miscibility pressure measured by pendant-drop method is 38.094 MPa and 39.2 MPa measured by slender tube method. The two pressure values are compared with the minimum miscibility pressure 38.715MPa obtained by linear regression extrapolation and their relative error is 1.60 % and 1.25 % respectively and the comparison results show that the slender tube method is more accurate.