多孔介质中爆炸的机理
The Mechanism behind Erosive Bursts in Porous Media
摘要：
在流经多孔介质期间的侵蚀和沉积可导致大的侵蚀性突发，其表现为渗透率和压力损失的跳跃。在这里，我们揭示了这些爆裂的原因是重新打开堵塞的孔隙时，孔的两个相对的网站之间的压力差超过一定的阈值。我们进行了数值模拟，通过多孔介质的流动，并将我们的预测与实验结果进行比较，恢复良好的协议形状和幂律分布的压力损失跳跃，以及作为颗粒浓度的函数的渗透率跳跃的行为。此外，我们发现，侵蚀性爆裂只发生在两个临界值的范围内的压力梯度阈值，独立于如何驱动的流量。我们的研究结果提供了一个更好的理解突然出砂的油井和突破过滤。
英文摘要：
Erosion and deposition during flow through porous media can lead to large erosive bursts that manifest as jumps in permeability and pressure loss. Here we reveal that the cause of these bursts is the re-opening of clogged pores when the pressure difference between two opposite sites of the pore surpasses a certain threshold. We perform numerical simulations of flow through porous media and compare our predictions to experimental results, recovering with excellent agreement shape and power-law distribution of pressure loss jumps, and the behavior of the permeability jumps as function of particle concentration. Furthermore, we find that erosive bursts only occur for pressure gradient thresholds within the range of two critical values, independent on how the flow is driven. Our findings provide a better understanding of sudden sand production in oil wells and breakthrough in filtration.
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