Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (5): 161-169.doi: 10.12108/yxyqc.20200517

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Miscible displacement simulation with dispersion

QI Tao1, HU Yong2, LI Qian1, ZHAO Zihan1, ZHANG Chun1, LI Tao1   

  1. 1. Research Institute of Exploration and Development, PetroChina Southwest Oil & Gas Field Company, Chengdu 610041, China;
    2. PetroChina Southwest Oil & Gas Field Company, Chengdu 610051, China
  • Received:2020-01-14 Revised:2020-03-02 Online:2020-10-01 Published:2020-08-08

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Abstract: Dispersion is an important mass transfer method in miscible displacement process,which determines volume sweep efficiency to a certain extent. However, dispersion is not considered in many miscible displacement processes. Therefore,the body center network model was built according to the stochastic modeling method. Kirchoff's law and finite difference method were used to solve the coupling of pressure field and concentration field of the model. The dynamic network simulation of miscible displacement was carried out,and the influences of pore structure characteristic parameters and fluid flow parameters on miscible displacement were analyzed. The results show that compared with miscible displacement without dispersion,miscible displacement with dispersion has larger volume sweep efficiency,later breakthrough time of displacement fluid and higher recovery degree corresponding to breakthrough. For the miscible displacement with dispersion,the stronger the heterogeneity of pores(or the lower the connectivity of pores,or the larger the viscosity ratio,or the larger the displacement flow),the more obvious the fingering phenomenon,the lower the volume sweep efficiency,the earlier the breakthrough time of front,and the lower the recovery degree. At the same time,the recovery degree corresponding to the breakthrough is linearly related to the heterogeneity of pores(or the connectivity of pores), and is exponentially related to the viscosity ratio(or displacement velocity). The results are of great significance to clarify the solute transport law and expand the volume sweep efficiency of displacement fluid.

Key words: dispersion, miscible displacement, network simulation, pore heterogeneity, pore connectivity, viscosity ratio, displacing velocity

CLC Number: 

  • TE357.4
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