Apparatus for and a method of severing multiple casing strings u

Details Apparatus for and a method of severing multiple casing strings u Apparatus for and a method of severing multiple casing strings u

1994-12-09

1995-11-21

Novosad, Stephen J.

Wells

Processes

Perforating, weakening, bending or separating pipe at an...

166 55, 166 63, 166299, E21B 2902

Patent

active

054678242

ABSTRACT:
A method of and apparatus for severing multiple concentric casing strings in an abandoned oil or gas well allowing the upper portion of the casing strings to be removed comprising positioning a container holding a sealed cylinder full of air at atmospheric pressure that is surrounded by a high velocity explosive in the casing at the location of the desired cut. Igniting the explosive at one end of the container so that the mixture detonates producing a shock wave and gas bubbles that travel downwardly progressively, collapsing the sealed cylinder and increasing the pressure of the air in the cylinder until the cylinder fails whereby pressurized air forced from the cylinder causes the shock wave and gas bubbles from the TNT, RDX, and aluminum mixture to move laterally and sever the casing strings.

REFERENCES:
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patent: 4694754 (1987-09-01), Dines et al.
patent: 4787315 (1988-11-01), Kenny
patent: 4798244 (1989-01-01), Trost

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