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根据非均质多孔介质渗流与示踪剂迁移理论,提出一种识别储层非均质性的双示踪剂方法,通过构建考虑层间绕流的非均质单管模型,对双示踪剂方法进行试验验证。该方法利用两种扩散系数存在明显差别的示踪剂(离子型化学示踪剂溴化钾KBr和颗粒型荧光标记示踪剂荧光碳纳米颗粒Cdot)分别反映非均质多孔介质的总孔隙体积和非均质多孔介质内流动区的孔隙体积,识别储层非均质性和评价注入水的波及状况。结果表明:均质条件下KBr和Cdot的穿透曲线基本重合,而非均质条件下KBr和Cdot的穿透曲线产生分离,且KBr和Cdot在多孔介质中的流体置换率或改变率fv值相差较大;在一定的注入速率条件下,通过分析KBr和Cdot的产出规律及其fv值的变化规律,可识别储层非均质性和评价注入水的波及状况,验证了双示踪剂方法的可行性和有效性。
According to the theory of heterogeneous porous media seepage and tracer migration, a dual tracer method to identify reservoir heterogeneity is proposed. By constructing a heterogeneous single-tube model that considers the laminar flow around the reservoir, Agent method of test validation. This method uses two tracers (KBr, an ionic chemical tracer, and Cdot, a fluorescent marker nanoparticle labeled with a fluorescent label) that have significant differences in diffusion coefficients to reflect the total pore volume of the heterogeneous porous media And pore volume in the flow zone within the heterogeneous porous media, identifying reservoir heterogeneities and assessing the influx of injected water. The results show that the breakthrough curves of KBr and Cdot under a homogeneous condition are basically coincident, while the breakthrough curves of KBr and Cdot under a heterogeneous condition are separated, and the fluid replacement rate or the change rate fv value of KBr and Cdot in a porous medium The difference between them is large. By analyzing the law of the output of KBr and Cdot and the variation law of fv value under certain injection rate, the heterogeneity of reservoir can be identified and the influent status of injected water can be identified. The dual tracer Feasibility and effectiveness of the method.