发明授权
US4987956A Apparatus for use in drilling a well at an offshore location 失效
用于在海上钻井的井的装置

Apparatus for use in drilling a well at an offshore location
摘要:
Apparatus is disclosed for use in drilling an offshore well wherein a drill string suspended from a drill ship for extension within a riser pipe, lower marine riser package and subsea wellhead including a blowout preventer stack may be sheared at a location intermediate the lower end of the riser pipe and a flex or ball joint of the riser package.
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