Reservoir Evaluation and Development ›› 2019, Vol. 9 ›› Issue (3): 32-35.

• Methodological and Theory • Previous Articles     Next Articles

Study on factors affecting minimum miscibility pressure of CO2 flooding by tie-line analysis

Yang Guangyu1,Tang Yong1,Li Zhaoguo2,Zhang Yongqiang2,Yu Guangming2   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. Exploration and Development Research Institute, Changqing Oilfield Company, PetroChina, Xi'an, Shaanxi, 710018, China
  • Received:2019-02-03 Online:2019-06-26 Published:2019-07-02


The minimum miscibility pressure(MMP) of CO2 flooding is affected by crude oil components and reservoir temperature. And its influence rule has great significance to screen and evaluate gas injection reservoirs. The tie-line analysis is a method to calculate MMP analytical approach which is faster, more accurate, and easier to operate. In this paper, a calculation process of simulating CO2 flooding by tie-line analysis was proposed, and the influence law of components(C4, C10, C14, C20) and temperature on MMP was studied. The results showed that the simulation results of the tie-line analysis were similar to those of the slim tube numerical simulation. The MMP increased with the increase of temperature, and the sensitivity of MMP for each component was more obvious in higher temperature. The MMP decreased with the increase of C4, C10 and C14 components, but increased with the increase of C20 component. The study proposed a new method with simple process and accurate calculation for calculating MMP and evaluating influencing factors.

Key words: CO2 miscible flooding, minimum miscibility pressure(MMP), crude oil component, tie-line analysis

CLC Number: 

  • TE357.45