Boring or penetrating the earth – Boring with explosion in inaccessible hole – With bore condition firing control – or compensating means
Patent
1988-12-12
1989-12-12
Novosad, Stephen J.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
With bore condition firing control, or compensating means
166 55, 166 651, 166297, 166 64, 175 452, E21B 43117, E21B 431185
Patent
active
048861260
ABSTRACT:
An electrically operated firing piston is provided for effecting the firing of a perforating gun in a subterranean well. The electrical firing system is disposed within a hollow housing which is detachably secured to the gun and is subject to the fluid pressures surrounding the perforating gun. The electrical firing system is armed through the application of a fluid pressure to the exterior of the housing which is in excess of the well hydrostatic pressure, thereby preventing premature firing of the perforating gun before insertion at its desired position in the well. The generation of an electrical firing pulse is controlled by a microprocessor which is preset to be responsive only to a selected value of fluid pressure surrounding the control housing. Thus, the pressure surrounding the perforating gun may be reduced to a selected under-balanced condition before the firing of the gun can be effected.
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patent: 4544034 (1985-10-01), George
patent: 4560000 (1985-12-01), Upchurch
patent: 4564076 (1986-01-01), Vann et al.
patent: 4650010 (1987-03-01), George et al.
patent: 4678044 (1987-07-01), Luke et al.
patent: 4770246 (1988-09-01), Ward
Baker Hughes Incorporated
Novosad Stephen J.
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