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Abstract: To research the influence of interfacial tension of fracturing fluid on spontaneous imbibiton in low-permeability water-wet reservoir, a spontaneous imbibition model was constructed upon a modified LW imbibition model includes hydrostatic pressure and flow resistance with fractal theory, and the relationship between spontaneous imbibition volume and imbibition time was described by the model. And the influence rules of spontaneous imbibition volume and interfacial tension was analysed. The imbibition model was verified by laboratory data. The experimental results and computing results reveal: the impact of interfacial tension to imbibition volume is not monotonous. Capillary force and flow resistance of oil phase increase with interfacial tension increasing, and meanwhile imbibition volume shows a trend from rise to decline. Each different kinds of fracturing fluid have optimal interfacial tension to reach the best imbibition effect, and imbibition volume is maximum.
Key words: spontaneous imbibition; low-permeability; nuclear magnetic resonance; imbibition volume; fractal
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