Detonation of tandem guns

Details Detonation of tandem guns Detonation of tandem guns

1983-11-18

1986-10-28

Novosad, Stephen J.

Boring or penetrating the earth

Boring with explosion in inaccessible hole

With wall engaging packer or anchor

175 454, 166 55, 166297, E21B 43117

Patent

active

046193332

ABSTRACT:
Method and apparatus for perforating a cased borehole in a single trip into the well include two or more strings of perforating guns supported within the wellbore. The strings of guns are attached to the lower end of a pipe string and located downhole with one of the strings of guns adjacent a formation to be perforated. The first string of guns is then detonated by hydraulic actuation to perforate the formation. The pipe string is then adjusted to properly align the second string of guns either with the same formation or with another formation in the wellbore. The second string of guns may then be actuated by any known method such as impact or pressure actuation. This method and apparatus allows the same formation to be perforated twice thereby doubling the number of perforations in the cased borehole or permits the testing or completion of another formation in the same well.

REFERENCES:
patent: 3612189 (1971-10-01), Brooks et al.
patent: 3717095 (1973-02-01), Vann

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