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    • 1. 发明授权
    • Marine well drilling method and apparatus
    • 海底钻井方法和装置
    • US3672447A
    • 1972-06-27
    • US3672447D
    • 1968-09-10
    • RICHFIELD OIL CORP
    • KOFAHL DAVID C
    • E21B7/12E21B7/128E21B7/20E21B33/035E21B33/064E21B43/01
    • E21B33/035E21B7/12E21B7/128E21B7/20E21B33/064
    • Method and apparatus for drilling an underwater well using subsurface wellhead equipment. A landing base is lowered at the lower end of a conductor pipe toward an underwater bottom. A guide frame is positioned above the landing base. A rotary driven tubular member, passed through the guide base is connected to the conductor pipe to drill the conductor pipe into the underwater bottom after the landing base rests on the bottom. The tubular member is removed after the conductor pipe is cemented and a bit is guided into the conductor pipe to drill hole for a surface casing having a mandrel at its upper end to which blowout preventers may be connected by a hydraulically actuated connector.
    • 使用地下井口设备钻探水下井的方法和装置。 着陆基座在导体管的下端朝向水下底部下降。 引导框架位于着陆基座的上方。 通过引导基座的旋转从动管状构件连接到导体管,以在着陆基座搁置在底部之后将导管钻入水下底部。 在导体管被接合之后,将管状构件移除,并且将钻头引导到导体管中以钻孔,用于具有心轴的表面壳体,其上端处可通过液压致动连接器连接防喷器。