Fluid sensitive, polarity sensitive safety detonator

Details Fluid sensitive, polarity sensitive safety detonator Fluid sensitive, polarity sensitive safety detonator

1990-03-15

1992-04-21

Nelson, Peter A.

Ammunition and explosives

Blasting

Patterned blasting

102313, 102265, F42B 300, F42C 1534

Patent

active

051057425

ABSTRACT:
A fluid sensitive, polarity sensitive safety detonator system for use in a perforating gun assembly is disclosed. The detonator system is housed within the perforating gun housing and is operatively connected to surface located detonating means. A non-electric detonator is selectively coupled with an electrically fired detonator so that the detonators are not coupled during transit, during arming of the device, during assembly of the device and at all other times. A polarity sensitive circuit selectively arms the detonator assembly and a safety interlock system automatically grounds the detonator assembly upon intrusion of borehole fluids within the peforating gun housing.

REFERENCES:
patent: 3034437 (1962-05-01), Schermer et al.
patent: 3858515 (1975-01-01), Rusbach
patent: 3911823 (1975-10-01), Murray et al.
patent: 3952658 (1976-04-01), Broyles
patent: 4062288 (1977-12-01), Millray
patent: 4063514 (1977-12-01), Hadfied
patent: 4158334 (1979-06-01), Osburn
patent: 4736682 (1988-04-01), Roosmann
patent: 4848235 (1989-07-01), Postler et al.

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