Single-wire selective perforation system having firing safeguards
US4527636A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 2, 1982 |
| Grant date | Jul 9, 1985 |
| Priority date | — |
| Expiry date | Jul 2, 2002 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/1185
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and system for selecting 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.