Explosive pipe crimping method and devices

Details Explosive pipe crimping method and devices Explosive pipe crimping method and devices

1992-04-27

1993-10-19

Nelson, Peter A.

Ammunition and explosives

Blasting

Patterned blasting

102309, 102310, 102312, 102313, 299 13, F42B 300

Patent

active

052535851

ABSTRACT:
A main charge of explosive is positioned symmetrically about a passageway-forming tubular member, such as a well pipe assembly. The charge is outwardly and radially spaced from the member and is coupled thereto by a dense medium, such as soil, which is adapted to transfer the produced explosive energy to the tubular member in the form of a pressure pulse applied by the medium. Initiation charges are supplied at the outer surface of the main charge, to initiate a detonation wave directed at the tubular member. A layer of dense medium is provided to confine the non-coupled surface of the charge and retard venting of explosive gases away from the tubular member. In the end result, concentrated, converging pressure pulses are applied to the tubular member on detonation, to cause it to be symmetrically crimped to restrict the passageway.

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patent: 5046563 (1991-09-01), Engel et al.

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