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    Sand screen for production oil wells
    48.
    发明授权
    Sand screen for production oil wells 失效
    砂筛生产油井

    公开(公告)号：US4754807A

    公开(公告)日：1988-07-05

    申请号：US023219

    申请日：1987-03-09

    申请人： Udo Lange

    发明人： Udo Lange

    IPC分类号： B01D29/15 ,  E21B43/08

    CPC分类号： E21B43/088 ,  B01D29/15

    摘要： In oil and gas production installations, formation sand may pass through sand screens and enter the tubing, causing damage and increasing abrasive wear. Gravel used to prevent this often leaves gaps and lets formation sand pass through. The invention eliminates such gaps by incorporating an ordinary polished bore (11) in the sand screen (4, 7) to land and seal off the wash pipe (9). Two concentric tubes (4a, 4b) are connected to each other by a collar (17) whose inside surface is a polished bore (11) and whose outer side has supports (17a, 17b) for the tubes (4a, 4b) and the upset screens.

    摘要翻译： 在石油和天然气生产设备中，地层砂可能通过砂筛并进入管道，造成损坏并增加磨损。 用于防止这种砂石经常留下间隙并使地层砂通过。 本发明通过将普通的抛光孔（11）结合在筛网（4,7）中来抵消和密封洗涤管（9）而消除了这种间隙。 两个同心管（4a，4b）通过其内表面是抛光孔（11）并且其外侧具有用于管（4a，4b）的支撑件（17a，17b）的套环（17）彼此连接，并且 沮丧的屏幕。