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1. 发明授权

US5957197A Downhole cut-off valve used for cementing 失效
标题翻译：用于固井的井下截止阀
公开(公告)号：US5957197A
公开(公告)日：1999-09-28
申请号：US850677
申请日：1997-05-02
申请人： Xianchang Xia , Fuyan Zhang , Shaoxia Han , Xijun Tian , Hong Li
发明人： Xianchang Xia , Fuyan Zhang , Shaoxia Han , Xijun Tian , Hong Li
IPC分类号： E21B21/10 , E21B33/13
CPC分类号： E21B21/10 , Y10T137/1677 , Y10T137/1789 , Y10T137/7869
摘要： A downhole cut-off valve used for cementing a casing string, comprising: an outer hollow body, having a top end connected at the lower end of the casing string, an inner hole, an inner surface and a projecting shoulder forming on the inner surface and extending inwardly; an inner hollow body, arranged slidably in said outer hollow body and having an inner hole, a wall with a plurality of through holes and a projection forming on the wall and below the through holes and extending outwardly, the projection being adapted to fit with the projecting shoulder of said outer body to define a preliminary position of said inner body with respect to said outer body; the longitudinal positions of the through holes and the projection being arranged in such a manner that the projecting shoulder of said outer body is located therebetween when said inner body is placed in said outer body and will at least partially cover the through holes in response to the movement of said inner body; a relief member, blocking the upper end of the inner hole of said inner hollow body and releasing automatically to expose the upper end of the inner hollow body when necessary; an adjusting member, arranged in the lower portion of said outer hollow body and being able to move longitudinally, and; a resilient member, arranged between said outer hollow body and said inner hollow body and having one end against the projection of said inner body and another end against said adjusting member.
摘要翻译：一种用于固定套管柱的井下截止阀，包括：外空心体，其具有连接在套管柱下端的顶端，内孔，内表面和形成在内表面上的凸肩并向内延伸内部空心体，其可滑动地布置在所述外部空心体中并具有内部孔，具有多个通孔的壁和形成在所述壁上并在所述通孔下方延伸并且向外延伸的突起，所述突起适于与所述外体的突出肩部限定所述内体相对于所述外体的初步位置; 所述通孔和所述突起的纵向位置被设置成使得当所述内部主体被放置在所述外部主体中时所述外部主体的突出的肩部位于其间，并且响应于所述外部主体至少部分地覆盖通孔所述内体的运动; 释放构件，阻挡所述内部空心体的内孔的上端，并且在需要时自动释放以暴露所述内部中空体的上端; 调节构件，布置在所述外部空心体的下部并能够纵向移动; 弹性构件，布置在所述外部空心体和所述内部空心体之间，并且一端抵靠所述内部本体的突出部，另一端抵靠所述调节构件。

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