| 摘要 |
A decelerator device (210), or shock absorber, for slowing the speed of a moving ball (106) approaching a ball seat (104) anchored in a tool (102) in a pipe string (200) of a subterranean well (220). The decelerator device (210) has a ball passage (208), an entrance port (204) which directs the moving ball (106) from an open mouth (202) of the entrance port (204) to a drag-inducing throat (207) of the ball passage (208), and directs the moving ball (106) towards a ball seat (104). The body (214) of the decelerator device (210) is made of a deformable, solid-state yielding material that displaces away from a centerline (103) of the ball passage (208) as the moving ball (106) with a diameter (105) larger than the throat (207) passes through the decelerator device (210). |
