Wells – Processes – Perforating – weakening – bending or separating pipe at an...
Patent
1991-06-17
1992-04-28
Novosad, Stephen J.
Wells
Processes
Perforating, weakening, bending or separating pipe at an...
29557, 298973, 175 455, 175 46, E21B 43117
Patent
active
051079291
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 heating 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:
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patent: 4771827 (1988-09-01), Barker et al.
Bouchard John H.
Garrana Henry N.
Novosad Stephen J.
Schlumberger Technology Corporation
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