公开(公告)号：US06745853B2

公开(公告)日：2004-06-08

申请号：US10265028

申请日：2002-10-04

申请人： Katherine M. Turner ,  Carey John Naquin

发明人： Katherine M. Turner ,  Carey John Naquin

IPC分类号： E21B712

CPC分类号： E21B7/28 ,  E21B7/122 ,  E21B17/01 ,  E21B19/24 ,  E21B41/0007

摘要： Methods and apparatus are disclosed for the open hole drilling of a borehole from an offshore platform and through a cased borehole at the seafloor. The drilling assembly includes a guide assembly extending from the platform to the seafloor and having a lower end extending into the cased borehole; and a bottomhole assembly disposed on a lightweight drill string extending through the guide assembly for drilling the borehole. The guide assembly is a pipe string and preferably includes a casing and a riser attached to the casing. The lightweight drill string may be a jointed pipe, a metal coiled tubing, or preferably a composite coiled tubing. The bottomhole assembly includes a formation displacement member adapted to drill a borehole having a diameter greater than the diameter of the guide assembly. The drilling assembly uses a drilling fluid that flows through the drill string and the bottomhole assembly, through a fluid passageway around the bottomhole assembly, and between said lower end and the cased borehole into the sea.

摘要翻译： 公开了用于从海上平台和通过海底的套管井眼开孔钻孔的方法和装置。 钻井组件包括从平台延伸到海底并具有延伸到套管钻孔中的下端的引导组件; 以及设置在穿过引导组件的轻型钻柱上的井底组件，用于钻孔。 引导组件是管柱，并且优选地包括附接到壳体的壳体和立管。 轻质钻柱可以是连接管，金属卷管，或者优选地是复合连续油管。 井底组件包括适于钻孔直径大于导向组件直径的钻孔的地层位移构件。 钻井组件使用穿过钻柱和井底组件的钻井流体，通过围绕井底组件的流体通道，以及在所述下端和套管井眼之间进入海洋。