As the duration of the filter cake layer thickness, increase, resistance increases, filtering the duration of the pressure difference with a straight-line growth.

随着过滤时间的持续，饼层厚度增加，阻力增大，过滤压差随时间的持续呈直线增长。

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When oil enters the hole of water-wet sandstone driven by pressure difference, oil migrates following a line of less resistance because of the migration force of oil is bigger than that of water.

油在压差驱动下注入亲水砂岩孔隙的过程中，油的运移阻力比水大，因而，油往往沿阻力较低的有限通道运移。

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Using the pressure difference formed by pressure difference regulating valve, overcome flow resistance of refrigerant in evaporater, supply excess low pressure liquid refrigerant for evaporater.

用压差调节阀形成的压差克服蒸发器内制冷剂的流动阻力，把低压液体制冷剂超量供入蒸发器。

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