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Single-wire selective performation system

  • US 4,496,010 A
  • Filed: 07/02/1982
  • Issued: 01/29/1985
  • Est. Priority Date: 07/02/1982
  • Status: Expired due to Term
First Claim
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1. In a single-line selective perforating system having a single firing line for electrically connecting a firing control unit to each of a plurality of shot modules, one at a time in a predetermined sequence, where each module is adapted for connecting the connected control unit to a next module, a method of selecting a module for firing comprising the step of connecting each module one at a time in the predetermined sequence to the firing line under control of module active time intervals internally generated in the modules, where each module generates its active time interval in response to being connected to the firing line with the next module in the sequence automatically connected to the firing line at the end of the active time for the last connected module if that module was not selected for firing during its active time interval.

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