欢26块地层油与CO2最小混相压力研究

在模拟欢26块油藏地层条件下，利用细管实验研究了CO2驱油效果，并测定地层油与CO2的最小混相压力。结果表明，在同样CO2注入量下，注入压力越大，累积采收率越大；注气量达到0.62~0.8PV后，CO2突破，生产气油比急剧上升，注入压力越大，CO2突破时注气量越多，但CO2突破后生产气油比上升越快。欢26块地层油与CO2的最小混相压力为23.6MPa，在地层压力可以达到CO2混相驱，在进行CO2非混相驱时，注入压力尽可能高，这样可取得更好的驱油效果。

The Study on MMP of CO2 and Formation Oil in Huan 26 Block

Based on simulate reservoir formation conditions of Huan 26 block, study the effect of CO2 flooding by using slim tube experiment and determine the MMP of CO2 and the formation oil. The results show that, in the same volume of CO2 injection, the higher injection pressure, the greater the accumulated recovery; CO2 begin breakthrough and produced gas oil ratio rapid increase when gas injection volume is reached 0.62~0.8PV, the higher injection pressure, the more injection volume when CO2 breakthrough, but the produced gas oil ratio increase faster after CO2 breakthrough. The MMP of CO2 and formation oil in Huan 26 is 23.6MPa, which can reach CO2 miscible flooding in formation pressure. The injection pressure as high as possible flooding when conduct CO2 immiscible displacement and so can obtaine better displacement effect.