Distributed charge for seismic prospecting

Details Distributed charge for seismic prospecting Distributed charge for seismic prospecting

G - Physics

01

V

349/13, 102/8

G01V 1/04 (2006.01) F42D 1/02 (2006.01) F42D 3/06 (2006.01) G01V 1/13 (2006.01)

Patent

CA 1128188

ABSTRACT OF THE DISCLOSURE 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 cross- overs without serious problems of disconnection or prema- ture initiation. Accordingly, axial length of each such fuse may be considerably more than the physical distance between the lump explosive charges.

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