Reservoir Evaluation and Development ›› 2018, Vol. 8 ›› Issue (4): 42-45.

• Petroleum Engineering • Previous Articles     Next Articles

Analysis of influence factor of minimum miscible pressure of CO2

Tang Yong,Zhao Xuemei,Wang Yang   

  1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
  • Received:2017-09-22 Online:2018-08-26 Published:2018-11-28


CO2 flooding is a promising way to improve the crude oil recovery ratio. CO2 could not only dissolve in crude oil, but also replace some light hydrocarbons or intermediate hydrocarbons in crude oil. So the composition has great influence on the component mass transfer and minimum miscible pressure of the CO2 miscible flooding. Therefore, the influence of the quantitative characterization of crude oil composition on the minimum miscible pressure of the CO2 miscible flooding has engineering significance for the reservoir screening. Taking the original formation fluid of a certain oilfield in China as the research object, we analyzed the multistage contact miscibility mechanism. Meanwhile, we used the Winprop module in CMG to carried out the phase simulation of experimental data. The results show that the minimum miscible pressure between CO2 and crude oil is proportional to the molar composition of N2, C1 and C11+, and inversely proportional to that of C2~C10. While the mixing of the CO2 and reservoir fluids needs higher reservoir pressure than minimum miscible pressure. It requires that when screening reservoirs with CO2 flooding, we should try to consider the reservoir with high mole content of C2 ~ C10 and low mole content of C24. It has great guiding significance for miscible displacement design and miscible phase prediction.

Key words: CO2 miscible flooding, minimum miscible pressure, crude oil component/composition, phase simulation

CLC Number: 

  • TE33