Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (2): 155-162.doi: 10.12108/yxyqc.20210216

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Influence of pore throat size distribution on oil displacement by spontaneous imbibition in tight oil reservoirs

WANG Fuyong1, YANG Kun2   

  1. 1. The Unconventional Oil and Gas Institute, China University of Petroleum (Beijing), Beijing 102249, China;
    2. Linfen Coalbed Methane Company, Sinopec East China Oil & Gas Company, Linfen 041000, Shanxi, China
  • Received:2020-07-20 Revised:2020-11-26 Online:2021-04-01 Published:2021-03-31

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Abstract: Spontaneous imbibition is an important development mechanism for tight oil reservoirs. It is of great significance to develop a correct mathematical model of spontaneous imbibition to clarify the law of oil production with spontaneous imbibition. Based on the capillary model,considering the distribution of irreducible water and residual oil saturation,using the two-dimensional Gaussian distribution function to fit the pore throat size distribution of tight sandstone obtained from high-pressure mercury intrusion,a core-scale mathematical model for oil displacement with spontaneous imbibition in a tight sandstone matrix was constructed,and verified with imbibition experiment. The influencing factors of imbibition law were analyzed to clarify the effects of pore throat distribution,wetting angle and interfacial tension on the oil production rate by spontaneous imbibition. The results show that the distribution of micro and nano pore throats in tight sandstone has the characteristics of two-dimensional Gaussian distribution in the semi-log plot. In the early stage of spontaneous imbibition,the imbibition rate mainly depends on the distribution of large pores,and the larger the core permeability is,the greater the imbibition and displacement rate is. In the middle and later stage of spontaneous imbibition,the imbibition rate is mainly affected by nanopores. The imbibition rate increases with the decrease of wetting angle,the increase of interfacial tension between oil and water and the decrease of oil viscosity. It can accurately predict the imbibition rate of tight reservoir by defining the pore throat distribution characteristics,which has a certain guiding role in determining the production system of tight reservoirs.

Key words: tight oil reservoir, spontaneous imbibition, pore throat size distribution, mathematical model, twodimensional Gauss distribution

CLC Number: 

  • TE357
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