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    Pressure actuated pack-off and method
    10.
    发明授权
    Pressure actuated pack-off and method 失效
    压力驱动包装和方法

    公开(公告)号：US4479544A

    公开(公告)日：1984-10-30

    申请号：US471399

    申请日：1983-03-02

    申请人： Rudy B. Callihan ,  Bobby F. Goad ,  Gary A. Miller

    发明人： Rudy B. Callihan ,  Bobby F. Goad ,  Gary A. Miller

    IPC分类号： E21B33/1295 ,  E21B33/14 ,  E21B43/10 ,  E21B33/13

    CPC分类号： E21B33/14 ,  E21B33/1295 ,  E21B43/10

    摘要： Mechanism for achieving the radial expansion of an annular elastomeric pack-off unit between the bore of a casing and the exterior of a liner, comprises a tubular sealing assembly threadably connected between the liner and the hanger and defining two inwardly projecting annular seals, an annular fluid pressure chamber, and radially disposed fluid inlet ports for the fluid pressure chamber located between the two inwardly projecting annular seals. An annular piston mounted in the annular pressure chamber effects the compressible expansion of an annular elastomeric seal element. A tubing extension of the work string is provided which may be selectively moved into sealing relationship with either or both of the internally projecting annular seals. During the cementing operation, the tubing extension engages both annular seals. After cementing, the tubing extension may be elevated by the work string to disengage from the lowermost one of the internally projecting annular seals and permit fluid pressure to be applied through the radial ports to the actuating piston. A backup or alternate method of operation is provided through the incorporation of radial ports in the work string pipe extension which are normally covered by a valve sleeve shearably secured to the pipe extension.

    摘要翻译： 用于实现环形弹性包装单元在壳体的孔和衬套的外部之间的径向膨胀的机构包括管状密封组件，其可螺纹地连接在衬套和衣架之间并且限定两个向内突出的环形密封件，环形密封件 流体压力室和用于位于两个向内突出的环形密封件之间的流体压力室的径向设置的流体入口。 安装在环形压力室中的环形活塞影响环形弹性体密封元件的可压缩膨胀。 提供了工作串的管道延伸部，其可以选择性地与内部突出的环形密封件中的一个或两个移动成密封关系。 在固井操作期间，管道延伸部接合两个环形密封件。 在固井之后，管道延伸部可以通过工作线升高以与内部突出的环形密封件中的最下面的一个分离，并且允许流体压力通过径向端口施加到致动活塞。 通过在工作管线延伸部中并入径向端口来提供备用或替代的操作方法，其通常被可变形地固定到管延伸部上的阀套所覆盖。