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    • 10. 发明申请
    • Pressure activated release member for an expandable drillbit
    • 用于可扩展钻孔的压力激活释放构件
    • US20060048972A1
    • 2006-03-09
    • US10935485
    • 2004-09-07
    • Albert OdellAndrew GledhillMichael SmalleyMark Fuller
    • Albert OdellAndrew GledhillMichael SmalleyMark Fuller
    • E21B10/32E21B7/28
    • E21B10/322
    • An apparatus for use in a wellbore. The apparatus includes a body and a blade assembly. The blade assembly is movable between a collapsed position whereby the expandable apparatus has a smaller outer diameter and an expanded position whereby the expandable apparatus has a larger outer diameter. The apparatus further includes a pressure activated member for selectively allowing the blade assembly to move from the closed position to the open position. A method for using the apparatus, wherein a drill string with an expandable bit at the end thereof is lowered into the wellbore. Thereafter, the pressure activated member is activated to allow the cutting members to move from the collapsed position to the expanded position. Subsequently, the expandable bit is rotated to form a portion of the wellbore. Next, the expandable bit is deactivated and the cutting members are moved from the expanded position to the collapsed position.
    • 用于井眼的装置。 该装置包括主体和叶片组件。 刀片组件可在折叠位置之间移动,由此可扩张装置具有较小的外径和扩张位置,由此可扩张装置具有较大的外径。 该装置还包括用于选择性地允许叶片组件从关闭位置移动到打开位置的压力启动构件。 一种使用该装置的方法,其中在其端部具有可膨胀钻头的钻柱下降到井筒中。 此后,启动压力启动部件,以允许切割部件从折叠位置移动到展开位置。 随后,可膨胀钻头旋转以形成井眼的一部分。 接下来,可膨胀钻头被停用,并且切割构件从展开位置移动到折叠位置。