Abstract Homogeneous models are typically used to analyze the results of pulse-decay tests for low permeability cores. However, this poses a problem because some samples are dual-porosity media with microcracks/macropores and micropores. In this study, numerical simulations were conducted and the results showed that the pulse decay curves of the dual-porosity models are different from those for the homogeneous model. The results indicated that the volumes of the upstream and downstream vessels play an important role in identifying dual-porosity media and the early time and late time are mainly influenced by the storativity ratio and interporosity flow coefficient, respectively. A pressure derivative method was proposed in this work in order to identify dual-porosity media at the early time and distinguish the interporosity flow models. This method is applicable for vessel volumes within one-tenth to ten times the pore volume. The proposed method was verified against the experimental data of other researchers.

中文翻译：

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双孔岩心脉冲衰减试验分析方法

摘要 齐次模型通常用于分析低磁导率岩心的脉冲衰减测试结果。然而，这带来了一个问题，因为一些样品是具有微裂纹/大孔和微孔的双孔隙介质。在这项研究中，进行了数值模拟，结果表明双孔隙度模型的脉冲衰减曲线不同于均质模型的脉冲衰减曲线。结果表明，上下游容器体积对双孔隙介质的识别具有重要作用，早期和晚期分别主要受储量比和孔隙度流动系数的影响。为了早期识别双孔隙介质，区分孔隙间流动模型，本文提出了压力导数法。该方法适用于孔体积十分之一到十倍范围内的容器体积。根据其他研究人员的实验数据验证了所提出的方法。