Method and apparatus for selectively actuating wellbore perforat

Details Method and apparatus for selectively actuating wellbore perforat Method and apparatus for selectively actuating wellbore perforat

1991-07-01

1992-05-26

Britts, Ramon S.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 55, 337145, E21B 4311

Patent

active

051158655

ABSTRACT:
In the representative embodiments of the several methods and apparatus of the invention disclosed herein, a movable detonating member is arranged to be selectively impelled against an impact-responsive detonator on a well bore perforator having one or more explosive devices. The movable detonating member is initially restrained from moving in relation of the tool body by a heat-responsive material which, in one embodiment, is operative to release the detonating member when an electrical heater on the tool is initiated from the surface for melting the bonding material or, in another embodiment, releases the detonating member when the material melted by elevated well bore temperatures. Other safety measures disclosed herein include temperature-sensitive barriers which, in one embodiment, prevents the movement of the detonating member against the explosive detonator until the material in the barrier is changed by elevated well bore temperatures as well as a second embodiment that precludes the transmission of detonating forces from the detonator and other explosives in the train of explosives on the bore perforator.

REFERENCES:
patent: 1380049 (1921-05-01), Fearn
patent: 2363234 (1944-11-01), Doll
patent: 2961958 (1960-11-01), Toomey et al.
patent: 3517758 (1970-06-01), Schuster
patent: 4169999 (1979-10-01), Kishel

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