Ammunition and explosives – Blasting – Borehole loading
Patent
1996-04-30
1997-12-23
Nelson, Peter A.
Ammunition and explosives
Blasting
Borehole loading
102312, 10220212, F42B 300, F42B 310
Patent
active
057009694
ABSTRACT:
A select fire gun assembly for jet perforating includes a plurality of shaped charges capable of being detonated by blasting caps activated by passage of current through the cap. The first electric terminal of each blasting cap of the gun assembly is grounded. A second terminal of each blasting cap is connected through an electronic switch to the output of a diode, with the input of the diode being connected to the logging cable. The polarity of the diodes are arranged in alternative sequence. The gate of the electronic switch is also connected to the diode through a large resistor and to the ground or a dart through another resistor. These electronic switches are closed when the gate is grounded. Current can flow through the blasting cap only when the gate is grounded and when the diode associated with the blasting cap is of the appropriate polarity to allow current to pass through.
REFERENCES:
patent: 5105742 (1992-04-01), Sumner
patent: 5322019 (1994-06-01), Hyland
patent: 5355802 (1994-10-01), Petitjean
patent: 5359935 (1994-11-01), Willett
patent: 5483895 (1996-01-01), Tomek et al.
patent: 5531164 (1996-07-01), Mosley
Klein Howard J.
Nelson Peter A.
Szekeres Gabor L.
Titan Specialties, Inc.
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