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(11) | EP 0 098 779 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | A single-wire selective perforation system having firing safeguards |
| (57) A method and system for selcting and arming each of a plurality of firing modules
in a single-line selective perforating system is disclosed. A single firing line connects
each firing module one at a time in a sequence to a control unit to receive power
and control signals therefrom. Each module generates internally a module active time
interval in response to being connected to the firing line power. Each time interval
has a first portion during which the module generates an identification pulse to the
control unit to uniquely identify that a particular module has been connected to the
firing line, and a second portion during which the module is enabled to receive a
selection pulse from the control unit to terminate further sequencing of the modules
to locate the module to be selected. The next module to receive power from the control
unit is connected to the firing line by a pass-through switch in the last connected
module at the end of its active time interval if that module was not selected. |