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

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

1987-01-30

1988-04-19

Novosad, Stephen J.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

Concave-shaped charge

F21B 43117

Patent

active

047383194

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: 4140188 (1979-02-01), Vann
patent: 4650009 (1987-03-01), McClure et al.

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