Addressable Switch Firing System | Schlumberger

ASFS

Addressable-switch firing system

The ASFS addressable-switch firing system is run within explosive devices. The system is a series of microprocessors attached to the initiators. Digital communication is used to operationally check and arm the switches. Each microprocessor has a unique address to individually identify the associated explosive device. All circuits, gun wiring, and connections can be checked at surface with the integrated perforating device tester (IPDT); while running in hole, checking is done with the perforation acquisition system. Positive shot indication is achieved through the switch requerying feature. In the case of a misfire or failed pressure switch, that explosive device can be skipped over. For critical operations, backup devices can be run as a contingency.

Available for all hollow carrier perforating gun systems and explosive plug-setting systems, the ASFS system is compatible with conventional detonators and Secure2 radio-frequency- (RF-) safe detonators. Up to 40 guns per descent can be run to efficiently perforate long intervals or multiple stages in one trip.

Dedicated surface equipment is used to check and communicate with the switches.
Dedicated surface equipment is used to check and communicate with the switches.
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