Perforating gun assembly including a carrier having a first sect

Details Perforating gun assembly including a carrier having a first sect Perforating gun assembly including a carrier having a first sect

1990-08-09

1991-11-12

Brown, David H.

Ordnance

Well perforators

166 551, 175 46, E21B 43117, F42B 102

Patent

active

050638220

ABSTRACT:
A novel dropoff apparatus adapted for use in a perforating gun or other such apparatus adapted to be disposed in a borehole includes an embrittled carrier section connected to a further section of the perforating gun or other such apparatus. The embrittled carrier section includes an embrittled carrier and a explosive charge, such as a capsule charge, mounted on the embrittled carrier. When the charge detonates, since the carrier section is embrittled, the carrier section is severed from further section of the perforating gun, or other apparatus, and the further section falls to a bottom of the borehole. The carrier section may undergo geometrical embrittlement by disposing a notch through at least one side of the carrier section; when the charge detonates, the carrier section is severed from the further section of the gun, or other apparatus, along a line connected to the notch, the further section of the gun, or other apparatus, falling to a bottom of the borehole. The carrier section may also undergo material embrittlement by either heating or heat treating the carrier section to the austenite region, and then quenching the carrier section; when the charge detonates, the carrier section shatters thereby separating the further section of the gun, or other apparatus, from the remainder of the perforating gun, the further section of the gun, or other apparatus, falling to a bottom of the borehole.

REFERENCES:
patent: 3048101 (1962-08-01), Lebourg
patent: 4253523 (1981-03-01), Ibsen
patent: 4467878 (1984-08-01), Ibsen
patent: 4496009 (1985-01-01), DerMott et al.
patent: 4765409 (1988-08-01), McClure et al.
patent: 4771827 (1988-09-01), Barker et al.

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