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1. 发明授权

US5829526A Method and apparatus for placing and cementing casing in horizontal wells 失效
标题翻译：将套管放置和固井在水平井中的方法和装置
公开(公告)号：US5829526A
公开(公告)日：1998-11-03
申请号：US745546
申请日：1996-11-12
申请人： Henry E. Rogers , David F. Laurel , Earl D. Webb , Grant L. Hartman , Kenneth G. Neal
发明人： Henry E. Rogers , David F. Laurel , Earl D. Webb , Grant L. Hartman , Kenneth G. Neal
IPC分类号： E21B21/10 , E21B23/00 , E21B23/04 , E21B33/16 , E21B43/10 , E21B33/14
CPC分类号： E21B23/00 , E21B21/10 , E21B23/04 , E21B33/16 , E21B43/10
摘要： Improved methods and apparatus for placing and cementing a casing string in a horizontal well bore section are provided. A float shoe is attached to the end of the casing string and a float collar is connected in the casing string for trapping air in a first portion of the casing string thereby causing it to be buoyed up during placement by drilling fluid contained in the well bore. A selectively openable and releasable closed baffle assembly is connected within the casing string for trapping air or a low density fluid in a second portion of the casing string thereby causing it to also be buoyed up by drilling fluid in the well bore. The buoying up of the casing string reduces placement drag and consequent compressive loading on the casing string. After placement, the closed baffle means is opened to allow fluid circulation and conditioning of the annulus. A bottom cementing plug is then landed on the baffle assembly and the baffle assembly is released and moved to the float collar. A cement slurry is thereafter placed in the annulus and allowed to set therein.
摘要翻译：提供了用于将套管柱放置和固定在水平井眼部分中的改进的方法和装置。浮子鞋附接到套管柱的端部，并且浮动套环连接在套管柱中，用于在套管柱的第一部分中捕获空气，从而使其在放置期间通过钻井液中的钻井液体浮起来。在套管柱内连接一个可选择的可开启和可释放的闭合挡板组件，用于在套管柱的第二部分中捕获空气或低密度流体，从而使其也可通过钻井中的钻井液浮起。套管柱的浮起减少了套管柱的放置阻力和随之而来的压缩载荷。在放置之后，封闭的挡板装置打开以允许环的流体循环和调节。然后将底部固井塞落在挡板组件上，并且挡板组件被释放并移动到浮动轴环。然后将水泥浆置于环状物中并使其置于其中。

2. 发明授权

US06622798B1 Method and apparatus for maintaining a fluid column in a wellbore annulus 有权
标题翻译：将流体柱保持在井筒环中的方法和装置
公开(公告)号：US06622798B1
公开(公告)日：2003-09-23
申请号：US10141598
申请日：2002-05-08
申请人： Henry E. Rogers , Harold O. Treece , Grant L. Hartman
发明人： Henry E. Rogers , Harold O. Treece , Grant L. Hartman
IPC分类号： E21B3314
CPC分类号： E21B43/10 , E21B33/136 , E21B33/14
摘要： A method and apparatus for maintaining the fluid column in an annulus are provided. The fluid column support, or fluid column seal is disposed about a second casing being lowered into a well through a first casing already cemented in the well. The fluid column support includes a seal connected to the second casing that engages the first casing as it is lowered therethrough. The seal will allow flow in an upward direction but prevents downward flow. The seal will support, or maintain a fluid column in the annulus between the first and second casing in the event that the fluid level below the seal drops for any reason, such as lost circulation or the failure of a buoyancy chamber in the second casing. The fluid seal, in conjunction with stage tools, provides hydrostatic pressure in the well to maintain proper fluid placement therein.
摘要翻译：提供了一种用于将流体柱保持在环形空间中的方法和装置。流体柱支撑件或流体柱密封件围绕第二壳体设置，该第二壳体通过已经胶合在井中的第一壳体而下降到井中。流体柱支撑件包括连接到第二壳体的密封件，当第一壳体通过其降低时，该密封件接合第一壳体。密封件将允许沿向上的方向流动，但是防止向下流动。如果密封件下方的液位由于任何原因而丢失，例如第二壳体中浮力室的流失或失效，则密封件将支撑或维持第一和第二壳体之间的环形空间中的流体柱。流体密封件与平台工具一起在井中提供静水压力以保持其中适当的流体放置。

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