Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Patent
1985-06-11
1987-02-03
Leppink, James A.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
Concave-shaped charge
89 115, 102310, 166 55, E21B 431185
Patent
active
046403701
ABSTRACT:
An apparatus for effecting the firing of a multisection perforating gun having a plurality of vertically spaced shaped charges wherein the firing is accomplished from the lowermost shaped charge to the uppermost shaped charge. The detonation of the shaped charges is accomplished by a primer cord which is detonated only by a booster charge located in the bottom portion of the assembled perforating gun housing. Hollow nipples are utilized to effect the assembly of the plurality of tubular gun sections in axially stacked relationship and a fusible tubular guide element is provided between each adjacent pair of nipples so as to permit a continuous primer cord, as well as a fusible cord, to be concurrently inserted throughout the length of the gun. The fusible cord is ignited by a firing mechanism located in the top portions of the gun or at the well surface, and the fusible cord transfers the ignition to the booster charge located in the bottom of the perforating gun housing, which in turn detonates the primer cord, with the resulting detonation effecting the firing of the shaped charges from the lowermost charges upwardly to the uppermost charges.
REFERENCES:
patent: 2831429 (1958-04-01), Moore
patent: 2935020 (1960-05-01), Howard et al.
patent: 2968243 (1961-01-01), Turechek
patent: 3128702 (1964-04-01), Christopher
patent: 3245485 (1966-04-01), Bell
patent: 4140188 (1979-02-01), Vann
patent: 4523649 (1985-06-01), Stout
Baker Oil Tools, Inc.
Dang Hoang C.
Leppink James A.
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