Downhole perforating method and apparatus using secondary explos

Details Downhole perforating method and apparatus using secondary explos Downhole perforating method and apparatus using secondary explos

1987-11-13

1988-08-09

Nelson, Peter A.

Ammunition and explosives

Blasting

Borehole loading

102312, 1022024, 1022027, 1022028, 10220214, 1022755, 1022756, 10227511, F42B 102

Patent

active

047620676

ABSTRACT:
For use in a perforating gun assembly, a perforating gun detonator is disclosed. One embodiment is hermetically sealed while the other has openings therein to admit well fluids. In both embodiments, a narrow conductive metal foil is provided with a current to vaporize the narrow foil, explode the foil and propel a flyer driven by a shock wave for detonation of a spaced secondary explosive. The explosive then couples explosion into a detonating cord against a shoulder in a housing adjacent to the secondary explosive. The current is formed by means of an AC voltage multiplier circuit providing a charge on a capacitor which is discharged through a spark gap. Charging circuitry includes a blocking capacitor to prevent DC and a resistor for bleeding a small current from the capacitor to ground which prevents static or stray current accumulation.

REFERENCES:
patent: 4307663 (1981-12-01), Stonestrom
patent: 4422381 (1983-12-01), Barrett
patent: 4592280 (1986-06-01), Shores
patent: 4602565 (1986-07-01), MacDonald et al.
patent: 4632034 (1986-12-01), Colle, Jr.
patent: 4662281 (1987-05-01), Wilhelm et al.
patent: 4716832 (1988-01-01), Sumner

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