| 摘要 |
There is disclosed an arming and disarming device which is run into a well bore on a wireline and which is part of an explosive tool to conduct some type explosive operation in the well bore. In the disarmed configuration, the arming sub acts to separate the hot lead in the wireline from the explosive tool, to short circuit the hot and ground leads of the explosive well tool together and to connect the short circuited tool leads to ground. In one mode of use of the arming sub, hydrostatic pressure applied to the tool as it is being run into the well bore acts to move a piston inside the device. As the piston moves, the hot lead of the wireline is electrically connected to the short circuited hot and ground connections of the explosive tool. Continued movement of the piston breaks the short circuit between the hot and ground connections of the explosive tool thereby arming the tool.
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