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    • 2. 发明申请
    • Downhole apparatus
    • 井下装置
    • US20060225885A1
    • 2006-10-12
    • US10543094
    • 2004-01-26
    • Bruce McgarianRory TullochNeil Moir
    • Bruce McgarianRory TullochNeil Moir
    • E21B34/00
    • E21B23/006E21B21/103
    • The invention relates to apparatus for use in wellbores and particularly, but not exclusively, to circulating subs used during downhole drilling operations. The apparatus includes a control groove and a pin received within the control groove for determining whether or not a longitudinal movement of a piston in a given direction relative to the apparatus body will move the apparatus between open and closed configurations. The apparatus further includes a control member located between and movable relative to the body and the piston. The control groove is defined in one of the piston and control member, and the pin is provided on the other of the piston and control member. Means are also provided for constraining movement of the piston relative to the body to longitudinal movement only. The invention thus provides an apparatus which has improved reliability in moving between open and closed configurations.
    • 本发明涉及在井筒中使用的装置,特别地但不排他地涉及在井下钻井作业中使用的循环槽。 该装置包括控制槽和接收在控制槽内的销,用于确定活塞在相对于装置主体的给定方向上的纵向运动是否将在打开和关闭构型之间移动装置。 该装置还包括位于主体和活塞之间并可移动的控制构件。 控制槽限定在活塞和控制构件中的一个中,并且销设置在活塞和控制构件的另一个上。 还提供了用于将活塞相对于身体的运动限制为纵向运动的装置。 因此,本发明提供了一种在打开和关闭构型之间移动的可靠性提高的装置。