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.
阐述了瀑布沟水电站土坝施工用的砾石土条筛、振动筛及长距离皮带输送机等的技术特点和布置。
The technical characters and deployment of the belt screeners, shaking screeners and long-distance belt conveyors for earth dam construction of Pubugou Hydropower Station are described.
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