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    • 1. 发明申请
    • DRILLING AND HOLE ENLARGEMENT DEVICE
    • 钻孔和孔扩展装置
    • US20070163809A1
    • 2007-07-19
    • US11669593
    • 2007-01-31
    • Alexander MackayGeorge EspirituCharles Dewey
    • Alexander MackayGeorge EspirituCharles Dewey
    • E21B10/32
    • E21B10/322E21B10/325E21B21/10
    • An expandable drilling apparatus includes a main body comprising a central bore and at least one axial recess configured to receive an arm assembly operable between a retracted position and an extended position, a biasing member to urge the arm assembly into the retracted position, a drive position configured to thrust the arm assembly into the extended position when in communication with drilling fluids in the central bore, a selector piston translatable between an open position and a closed position, wherein the selector piston is thrust into the open position when a pressure of the drilling fluids exceeds an activation value, wherein the drilling fluids are in communication with the drive piston when the selector piston is in the open position, and a selector spring configured to thrust the selector piston into the closed position when the pressure of the drilling fluids falls below a reset value.
    • 一种可膨胀钻孔设备包括:主体,其包括中心孔和至少一个轴向凹槽,所述至少一个轴向凹槽构造成容纳在缩回位置和延伸位置之间可操作的臂组件;偏压构件,用于将臂组件推入缩回位置;驱动位置 构造成当与中心孔中的钻井流体连通时将臂组件推入伸出位置,可在打开位置和关闭位置之间平移的选择活塞,其中当钻孔压力时,选择活塞被推入打开位置 液体超过激活值,其中当选择活塞处于打开位置时,钻井液与驱动活塞连通;以及选择器弹簧,其构造成当钻井液的压力下降时推动选择活塞进入关闭位置 一个复位值。