The pulse-decay method is a transient approach widely employed for permeability measurements, holding significant relevance for modeling and utilizing flow in low permeable porous media. Most of the existing pulse-decay methods predominantly rely on pressurization or depressurization in one chamber, requiring gas penetration through the entire sample and complete attenuation, which may take a long time for ultra-low-permeability materials. This study proposes the congenetic bilateral pulse-decay method by utilizing a bypass conduit to achieve bilateral pulses to accelerate the measurement process. The mathematical and physical modeling along with the realistic experimental conditions leads to more concise analytical solutions and permeability calculation methods. Comparisons of measurement duration and sensitivity between the present method and the previous pulse-decay methods show that this new method achieves an efficiency improvement of at least four times while maintaining the simultaneity and symmetry of bilateral pulse with a straightforward and cost-effective experimental setup. This measurement method may further reduce the measurement time and costs in permeability measurements of ultra-low permeable porous media.

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基于同源双边脉冲衰减的渗透率快速测量方法


脉冲衰减方法是一种广泛用于渗透率测量的瞬态方法，对于低渗透多孔介质中的流动建模和利用具有重要意义。大多数现有的脉冲衰减方法主要依赖于在一个腔室中加压或减压，需要气体渗透整个样品并完全衰减，这对于超低渗透率材料可能需要很长时间。本研究提出了同源双边脉冲衰减方法，利用旁路导管实现双边脉冲，以加速测量过程。数学和物理建模以及现实的实验条件导致更简洁的解析解和渗透率计算方法。本方法与之前的脉冲衰减方法之间的测量持续时间和灵敏度的比较表明，这种新方法通过简单且具有成本效益的实验设置，在保持双边脉冲的同时性和对称性的同时，实现了至少四倍的效率提升。该测量方法可以进一步减少超低渗透多孔介质渗透率测量的测量时间和成本。