公开(公告)号：US06263969B1

公开(公告)日：2001-07-24

申请号：US09366837

申请日：1999-08-04

申请人： Carl W. Stoesz ,  Gary E. Cooper

发明人： Carl W. Stoesz ,  Gary E. Cooper

IPC分类号： E21B3408

CPC分类号： E21B21/103 ,  Y10T137/2592

摘要： A bypass sub which will automatically bypass fluid flow in excess of a selected optimal flow rate for a downhole mud motor. A spring biased mandrel within a housing is driven downwardly by increased fluid flow, and driven upwardly by spring force upon decreased fluid flow, to control the alignment of a port in the mandrel with a bypass port in the housing, thereby maintaining a desired rate of fluid flow to the downhole motor.

摘要翻译： 旁路副，其将自动地绕过井下泥浆马达超过选定的最佳流速的流体流。 壳体内的弹簧偏置心轴被增加的流体流动向下驱动，并且在减少的流体流动时由弹簧力向上驱动，以控制心轴中的端口与壳体中的旁路端口的对准，从而保持期望的速率 流体流向井下电机。