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.
产品简介：采用自主研发的不锈钢类膨胀管，膨胀防砂筛管由多层组成，缝隙大小可依据地层砂粒情况设计。
Introduction: Made our patent expable-tubular stainless steel material, Expable S Screen is composed of the multi-layer, whose slit size is designed based on the stratums grains.
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