Well perforating gun

Ordnance – Well perforators

Reexamination Certificate

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Details

C102S313000, C175S002000

Reexamination Certificate

active

06865978

ABSTRACT:
The borehole of many wells, including oil and gas production wells, is frequently cased with a steel or similar metal casing. In order to extract oil or other material existing within the surrounding geologic formation, it is necessary to puncture the casing. Currently, this is accomplished with tubes (guns) containing explosive charges being lowered into the well bore and detonated, causing the tube and well casing to be punctured and the geologic formation shattered. The guns are made from high strength, thick-walled and machined metal. This invention discloses a multi-layered or composite tube that enhances the directional orientation of the explosive charges utilizing less costly and more easily fabricated material. The invention also discloses a gun having properties to allow the desired directionally oriented perforation by the explosive charge without being deformed and jammed within the well casing. Other advantageous are also disclosed.

REFERENCES:
patent: 2649046 (1953-08-01), Davis
patent: 2750885 (1956-06-01), Schlumberger
patent: 2980017 (1961-04-01), Castel
patent: 5775426 (1998-07-01), Snider et al.
patent: 5960894 (1999-10-01), Lilly et al.
patent: 6336506 (2002-01-01), Wesson
patent: 6520258 (2003-02-01), Yang et al.
patent: 6679327 (2004-01-01), Sloan et al.
patent: 20020134585 (2002-09-01), Walker

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