| 摘要 |
A running tool 30 has a latching connection to a downhole device on its lower end 32 and, on its upper end 52, an attachment to a wireline extending down a wellbore. The downhole device has a fishneck 34 on its upper end. The running tool has an electrically operable release mechanism 40, 42, 43, 44 that releases the latching connection. A control means 46 operates the release mechanism when a sensor 48 detects a parameter of a predetermined value in the wellbore at a selected location, such as pressure, acceleration, temperature or time. The control means may also operate the release mechanism when an activation signal is received via the wireline. The latching connection may comprise a clamp 36 engaged by a cam surface 38. There may be a plurality of sensors. An electrical battery or electrical power source may be connected to the release mechanism. |
