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1. 发明授权

US5379844A Offshore platform well system 失效
标题翻译：海上平台井系统
公开(公告)号：US5379844A
公开(公告)日：1995-01-10
申请号：US13506
申请日：1993-02-04
申请人： M. Sidney Glasscock , Gerasime M. Monopolis
发明人： M. Sidney Glasscock , Gerasime M. Monopolis
IPC分类号： E21B7/12 , E21B33/035 , E21B43/017 , E21B43/013 , F21B7/128
CPC分类号： E21B7/12 , E21B33/035 , E21B41/08 , E21B43/017
摘要： A well system, and a method for installing the well system, for use in producing hydrocarbons from a subterranean reservoir located beneath a body of water is disclosed. The well system is intended for use in conjunction with a bottom-founded offshore platform. The inventive well system eliminates the conductors traditionally used in offshore platform well systems. According to the invention, a subsea guide template and an outer casing string extending downwardly from the guide template to a first predetermined depth less than the depth of the reservoir are installed prior to installation of the offshore platform. Thereafter, the platform and the first intermediate casing string are installed, in either order. Drilling for the first intermediate casing string takes place in the open hole defined by the outer casing string with all returns of drilling fluid and drill cuttings occurring at the seafloor. Preferably, the in-water portion of the first intermediate casing string serves as a removable drilling riser for conducting all subsequent drilling operations. The well is then completed in the conventional manner. The present invention may advantageously be combined with pre-installation of some or all of the platform's foundation piles to provide the added benefit of achieving a "storm-safe" condition in a matter of a few hours.
摘要翻译：公开了一种井系统和用于安装井系统的方法，用于从位于水体下方的地下储层生产碳氢化合物。井系统旨在与底层创立的海上平台结合使用。本发明的井系统消除了传统上在海上平台井系统中使用的导体。根据本发明，在海上平台的安装之前，安装一个从引导模板向下延伸到小于储层深度的第一预定深度的海底引导模板和外套管柱。此后，平台和第一中间套管柱以任一顺序安装。第一中间套管柱的钻孔发生在由外套管柱定义的开孔中，钻井液和钻屑在海底出现全部回报。优选地，第一中间套管柱的水中部分用作用于进行所有随后的钻井操作的可移除的钻井立管。然后以常规方式完成井。本发明可以有利地与预先安装一些或所有平台的基础桩以提供在几个小时内实现“风暴安全”状况的附加好处。

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