Distributed charge for seismic prospecting

Details Distributed charge for seismic prospecting Distributed charge for seismic prospecting

1978-09-15

1982-02-02

Brown, David H.

Acoustics

Geophysical or subsurface exploration

Seismic wave generation

102317, 102320, F42D 102, F42D 306

Patent

active

043133800

ABSTRACT:
A distributed charge for use in producing a very sharp impulse for seismic prospecting comprises a series of lump explosive charges placed preferably of the order of at least 20 feet apart in a fluid in a well, connected with novel timed fuses. These fuses are each made of a short top section of a small diameter detonating linear explosive and a considerably longer, lower section which is a non-detonating linear deflagrator, terminating in a blasting cap inserted in the next lower lump explosive charge. The lower section is in the form of a thin-walled plastic tube lined with the active chemical agent. It may be crumpled or bent into various shapes including crossovers without serious problems of disconnection or premature initiation. Accordingly, axial length of each such fuse may be considerably more than the physical distance between the lump explosive charges.

REFERENCES:
patent: 2609885 (1952-09-01), Silverman
patent: 2770312 (1956-11-01), Silverman
patent: 2992611 (1961-07-01), Felch
patent: 3057296 (1962-10-01), Silverman
patent: 3064570 (1962-11-01), Smith
patent: 3131633 (1964-05-01), Eisler et al.
patent: 3154013 (1964-10-01), Miller
patent: 3196974 (1965-07-01), Barnes
patent: 3238871 (1966-03-01), Lang
patent: 3285171 (1966-11-01), Moore
patent: 3712220 (1973-01-01), Marke et al.
S. T. Martner et al., "Broomstick Distributed Charge", Geophysics, vol. XXVII, No. 6, Part II, pp. 1,007-1,015.

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