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.
该术语同样用于砾石充填，去描述在环空内充填沙子或砾石。
The term is also used in gravel packing to describe the act of placing all the sand or gravel in the annulus.
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