由水垢、井筒充填物或岩屑等物质的堆积所造成的井筒障碍物，这些物质会限制井筒的通路，严重时最终使井筒关闭。
A wellbore obstruction caused by a buildup of material such as scale, wellbore fill or cuttings that can restrict wellbore access or, in severe cases, eventually close the wellbore.
该装置由透明模拟试验井筒、起升系统、砾石充填设备、数据采集和图象处理系统五大部分组成。
The device is comprised of transparent well bore, hoisting mechanism, gravel packing device, data acquisition system and image processing system.
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.
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