Apparatus and method for use in subsurface oil and gas well perf

Boring or penetrating the earth – Boring with explosion in inaccessible hole – Concave-shaped charge

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175 456, 166 55, E21B 43116

Patent

active

046500090

ABSTRACT:
A detonation shock wave perforating system for use in perforating subsurface earth formations traversed by a borehole. The system includes a plurality of mechanically serially connected perforating gun sections, each section of which may contain a plurality of shaped charges mounted therein and a length of detonator cord. To provide coupling of the detonation shock wave between housing sections, a booster is coupled to the detonator cord and mounted proximate a shaped charge having its axis of perforation aligned along the longitudinal axis of the gun. Detonation of the shaped charge results in a jet which detonates a quantity of explosive material in the subsequent gun section the detonation of which transfers a detonation shock wave into a detonator cord, thereby detonating any explosive connected thereto. An alternate embodiment provides for coupling of the detonator wave without using a shaped charge unit. Further, the propagation system allows any excess length of detonator cord present within the perforating gun sections to be removed.

REFERENCES:
patent: 2326406 (1943-08-01), Spencer
patent: 2543814 (1951-03-01), Thompson et al.
patent: 2649046 (1953-08-01), Davis
patent: 2761384 (1956-09-01), Sweetman
patent: 3080005 (1963-03-01), Porter
patent: 3659658 (1972-05-01), Brieger

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