为了研究压裂液的界面张力对低渗亲水储层自发渗吸的影响,基于改进的LW渗吸模型,考虑静水压力以及流动阻力的影响,结合分形理论,建立描述自发渗吸体积与渗吸时间之间关系的自发渗吸模型,利用建立的模型分析计算自发渗吸体积随界面张力的变化规律,并通过试验数据验证模型的可靠性与结论的正确性.试验结果和模型计算分析结果表明:界面张力对自发渗吸体积的影响呈非线性,随着界面张力的增加,渗吸动力和流动阻力同时增加,渗吸采收率呈现先上升后下降的趋势,针对不同种类的压裂液,都存在某一最佳界面张力值,使渗吸效果达到最好,得到最大自发渗吸体积.%In order to reveal the influence of the interfacial tension between fracturing fluid and rock surface on spontaneous imbibiton in low-permeability water-wet reservoirs, a spontaneous imbibition model was constructed upon a modified LW im-bibition model, considering hydrostatic pressure and flow resistance based on the fractal theory, and the relationship between spontaneous imbibition volume and time was then described using the model.The influence of the interfacial tension on spon-taneous imbibition volume was analyzed and revealed, and the imbibition model was verified in comparison with the laboratory data.The experimental and modeling results indicate that the impact of the interfacial tension on the imbibition volume is not monotonous.The capillary force and flow resistance of the oil phase increase with the interfacial tension, while the imbibition volume increases initially and then declines.The value of the interfacial tension can be optimized to obtain the best imbibition effect, and to maximize the imbibition volume and oil recovery.
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