| 摘要 |
Apparatus for controlling a downhole device in a well, comprises a body having a control slot engaging a pin. Movement of the pin relative to the control slot switches the device between active and inactive states. The slot has at least one loop and at least one elongated axial track spaced around the body with respect to the at least one loop. The pin can move in the at least one elongated axial track between different configurations of the pin and slot which correspond to active and inactive configurations of the downhole device. Each of the at least one elongated axial track is connected to one of the at least one loop via a deviate branch track, and the control slot has no separate, dedicate return path for returning the pin from the deviate branch track to the elongated axial track. |
