Explosives package for coupled cast primer compositions

Details Explosives package for coupled cast primer compositions Explosives package for coupled cast primer compositions

1979-09-21

1981-10-13

Nelson, Peter A.

Ammunition and explosives

Blasting

Contained blasting charge

206 3, C06B 1100

Patent

active

042941717

ABSTRACT:
An explosives package is disclosed comprising a plastic tubular container having male and female ends adapted to be coupled with like containers to form a column, and primer and blasting explosives contained therein. The container is open at both ends and has an internal circumferential ring seat. The ring seat and open end of the container enables a cast primer composition to be poured through the open end onto a piston which is in fluid-tight relationship with the ring seat. A capwell thimble is inserted into and retained in the side of the male end of the container so that the closed end of the capwell is situated within the cast primer composition. The male end of the container in the area of the capwell is adapted to provide protection for the legwires of a blasting cap inserted in the capwell from being nipped or damaged by other, coupled, containers or borehole walls; the protection is preferably provided by a depression around the capwell entrance and a longitudinal channel leading therefrom, on the exterior of the container. Subsequent to pouring the cast primer composition into the container and allowing the composition to solidify, the piston is removed from the container and a blasting explosive e.g. a slurry explosive in a "chub" package is inserted into the container and is retained therein by a closure disc. The primer and blasting explosive are in abutting relationship with the container.
The explosives package is particularly useful in seismic prospecting applications.

REFERENCES:
patent: 3395642 (1968-08-01), Foster et al.
patent: 3504628 (1970-04-01), Pack et al.
patent: 3731625 (1973-05-01), Slawinski
patent: 3760728 (1973-09-01), McKee et al.
patent: 4000696 (1977-01-01), Friant et al.
patent: 4199093 (1980-04-01), Combette et al.

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