Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge
Patent
1981-08-10
1985-01-29
Pate, III, William F.
Boring or penetrating the earth
Boring with explosion in inaccessible hole
Concave-shaped charge
166297, E21B 43111
Patent
active
044960085
ABSTRACT:
The apparatus comprises an elongated support (22) having a series of flat-faced portions and explosive charges (23) mounted perpendicular to the flat faces. Detonating cords are connected to the charges to fire them.
Each portion of the support has two closely spaced attachment holes adapted to receive respectively the rear parts of the two charges mounted in opposite directions on each face of this section. The support is made up of a tube flattened transversely so as to form the flat-faced portions. Spacers are disposed between the charges and the support for casings of large diameter. The cases of the charges comprise a cover made of ceramic material and an extruded steel body which tends to flare out when the explosive is detonated rather than being broken into pieces.
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patent: 2799229 (1957-07-01), Long
patent: 3048101 (1962-08-01), Lebourgh
patent: 3078797 (1963-02-01), Blair
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patent: 3276369 (1966-10-01), Bell
patent: 3305036 (1967-02-01), Schuster
patent: 3415321 (1968-12-01), Venghiattis
patent: 3565188 (1971-02-01), Hakala
patent: 3965993 (1976-06-01), Lavigne et al.
Chesnel Pierre
Pottier Alain
Pate III William F.
Schlumberger Technology Corporation
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