公开(公告)号：US08967300B2

公开(公告)日：2015-03-03

申请号：US13345400

申请日：2012-01-06

申请人： Charles H Dewey ,  John E. Campbell ,  Daniel LeVon

发明人： Charles H Dewey ,  John E. Campbell ,  Daniel LeVon

IPC分类号： E21B10/32

CPC分类号： E21B10/322 ,  E21B21/103 ,  E21B34/10 ,  E21B2034/007

摘要： A downhole tool includes a pressure activated flow switch for selectively actuating and deactuating a device, such as a reaming block. The flow switch is deployed external to the flow bore and includes a flow piston configured to reciprocate between axially opposed open and closed positions such that the device is actuated when the flow piston is in the open position and deactuated when the flow piston is in the closed position. The flow piston is configured to translate from the closed position to the open position when a differential pressure exceeds a predetermined threshold. The flow piston may be further configured to remain in the open position at differential pressures less than the threshold.

摘要翻译： 井下工具包括用于选择性地致动和停用诸如铰孔块的装置的压力启动流量开关。 流动开关被布置在流动孔的外部，并且包括流动活塞，流动活塞构造成在轴向相对的打开和关闭位置之间往复运动，使得当流动活塞处于打开位置时该装置被致动，并且当流动活塞处于关闭状态时停止运动 位置。 流动活塞构造成当压差超过预定阈值时从关闭位置平移到打开位置。 流动活塞可进一步构造成在小于阈值的差压下保持打开位置。