由于携砂液向地层的滤失以及通过筛管缝隙的流体质量交换，水平井砾石充填过程中冲筛、井筒环空两个流动系统均为复杂的变质量流。
During the process of gravel-packing in horizontal Wells, there are the filtration flow of the carrier fluid to the formation and the exchange flow through the screen slots.
充填效率随携砂液中砾石浓度、滤失量及砾石直径的增加而降低。
The packing efficiency decreases with the increase of gravel concentration in injected liquid, fluid loss to formation and gravel size.
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