Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (6): 181-188.doi: 10.12108/yxyqc.20240617

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

Simulation of microscopic seepage characteristics of CO2 immiscible flooding under the effect of diffusion and adsorption

CUI Chuanzhi1, LI Jing1, WU Zhongwei2   

  1. 1. School of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. School of Petroleum Engineering, Yangtze University, Wuhan 430100, China
  • Received:2023-07-04 Revised:2023-09-17 Online:2024-11-01 Published:2024-11-04

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Abstract: Based on a two-dimensional model，a numerical simulation method was used to establish a numerical model of CO2 immiscible flooding，and the level set method is used to simulate the microscopic seepage laws of CO2 immiscible flooding and near miscible flooding under diffusion and adsorption. The microscopic seepage characteristics and diffusion adsorption characteristics of CO2 in pores were studied，and the influences of the injection velocity，diffusion coefficient，and adsorption reaction rate constant on the microscopic seepage charac teristics of near miscible flooding were analyzed. The results show that：（1）The degree of reserve recovery of the CO2 flooding numerical simulation using the phase field method is 51.29%，and the degree of reserve recov ery of theCO2 flooding numerical simulation using the level set method is 53.60%. The level set method is more suitable for simulating the seepage process of CO2 immiscible flooding.（2）Under immiscible flooding condi tions，CO2 preferentially diffuses into large pores，with a recovery efficiency of 87.7%，an outlet gas content rate of 71.60%，and a maximumCO2 surface adsorption concentration of 3.16×10-4 mol/m2. Under the conditions of near miscible flooding，CO2 is more likely to diffuse into small pores，with a recovery efficiency of 91.1%，an outlet gas content rate of 97.01%，and a maximum CO2 surface adsorption concentration of 5.81×10-4 mol/m2. （3）The microscopic seepage of miscible flooding is influenced by factors such as the injection velocity，diffu sion coefficient，and adsorption reaction rate constant. The injection rate increases，resulting in an increase in both the gas content and recovery rate at the outlet. An increase in diffusion coefficient and adsorption reaction rate constant will lead to an increase in recovery efficiency and a decrease in outlet gas content.

Key words: CO2 immiscible flooding, microscopic seepage characteristics, injection velocity, diffusion coeffi cient, adsorption reaction rate constant, recovery efficiency, numerical simulation

CLC Number: 

  • TE357.45
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