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    • 9. 发明申请
    • DOWNHOLE ACTIVATABLE ANNULAR SEAL ASSEMBLY
    • 卧式活动环形密封组件
    • WO2005001237A8
    • 2006-11-02
    • PCT/US2004020044
    • 2004-06-23
    • BAKER HUGHES INC
    • KRUEGER SVENGRIMMER HARALDKRUEGER VOLKER
    • E21B21/00E21B21/08E21B21/10E21B33/126E21B33/127
    • E21B21/00E21B21/08E21B21/10E21B33/126E21B33/127E21B2021/006
    • Devices and methods are described for establishing an effective annular seal about between an active pressure differential device (170) and a surrounding wellbore sidewall (90). The invention provides a means of selectively activating such a seal during drilling operations or other operations wherein drilling mud is flowed through the drill string and returns through the annulus. The annular seal assembly may include an inflatable packer element and a hydraulic inflation system. The hydraulic inflation system uses the fluid pressure provided by drilling mud that is returning to the surface via the annulus to inflate the packer element and set the seal. The hydraulic inflation system also buffers and regulates the fluid pressure setting the packer element to avoid overinflation of the element. In other aspects, the seal assembly may comprise a set of mud cups that are set against the borehole sidewall using a pressure differential across the seal assembly or a spring-biased seal element.
    • 描述了用于在主动压差装置(170)和周围井筒侧壁(90)之间建立有效的环形密封件的装置和方法。 本发明提供了一种在钻井操作或其他操作中选择性地激活这种密封的装置,其中钻井泥浆流过钻柱并通过环返回。 环形密封组件可以包括充气封隔器元件和液压充气系统。 液压膨胀系统使用由钻孔泥浆提供的流体压力,该泥浆通过环返回到表面,以使封隔器元件膨胀并设置密封。 液压膨胀系统还缓冲和调节设置封隔器元件的流体压力,以避免元件的过度充气。 在其他方面,密封组件可以包括一组泥杯,其使用跨越密封组件的压差或弹簧偏压的密封元件抵靠钻孔侧壁设置。