Rapid Pseudo-Static Measurement of Hysteretic Capillary Pressure-Saturation Relationships in Unconsolidated Porous Media
Rapid Pseudo-Static Measurement of Hysteretic Capillary Pressure-Saturation Relationships in Unconsolidated Porous Media
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松散多孔介质中迟滞毛细管压力-饱和度关系的快速伪静态测量
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发表时间：
2007
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通讯作者：
T. Kibbey
中科院分区：
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作者：
Lixia Chen;G. Miller;T. Kibbey
开发了一种自动化系统，用于快速测量详细的滞后毛细管压力-饱和度（Pc-S）关系，包括主排水，主吸胀和扫描回路。该方法利用慢动态（伪静态）测量方法，该方法能够复制静态结果，同时扩展可以应用高渗透性毛细管屏障的压力范围，并增加可以收集的滞后数据的数量。该方法被证明为两个砂和三个粉砂的毛细管压力高达1000厘米水（98千帕）。对于所示的实验，对于所有材料，主要排水和主要吸入回路在约6.5小时内完成，完整运行（包括多个扫描曲线）在不到20小时内完成。一个模型，用于选择的压力率需要复制静态结果，并发现产生的结果一致，与jumically-determined率。该模型还预测了系统电阻对动态响应的影响，并发现与实验结果吻合良好，特别是对于接近伪静态条件所需的较慢速率。
An automated system was developed for a rapid measurement of detailed hysteretic capillary pressure-saturation (Pc-S) relationships, including primary drainage, main imbibition, and scanning loops. The method makes use of a slow-dynamic (pseudo-static) measurement method which is able to duplicate static results while expanding the pressure range over which high permeability capillary barriers can be applied, and increasing the quantity of hysteretic data that can be collected. The method is demonstrated for two sands and three silts for capillary pressures as high as 1000 cm water (98 kPa). For the experiments shown, primary drainage and main imbibition loops were completed within approximately 6.5 h for all materials, with full runs, including multiple scanning curves, completed in less than 20 h. A model for selection of pressure rates needed to duplicate static results is presented and is found to produce results consistent with empirically-determined rates. The model also predicts the effects of system resistance on dynamic response and is found to be in good agreement with experimental results, particularly for slower rates approaching those needed for pseudo-static conditions.