System for preventing cutting gas explosion during subterranean

Details System for preventing cutting gas explosion during subterranean System for preventing cutting gas explosion during subterranean

1991-09-19

1993-08-24

Neuder, William P.

Wells

Submerged well

Means removably connected to permanent well structure

166356, E21B 2912

Patent

active

052380696

ABSTRACT:
An apparatus and system designed to prevent cutting gas buildup and explosion of same during the cutting of underwater abandoned wellheads and the like. The present system as configured is primarily designed for use in conjunction with generally longitudinally arranged pipes such as wellhead conductor pipe or the like, and teaches an apparatus configured to slidingly envelope the pipe, having the capability for excavating the area immediately about the pipe such that the apparatus migrates about and down the pipe to a predetermined depth, flushing out the mud about the conductor pipe which sometimes traps cutting torch gas during cutting operations and causes explosions or the like. The present system utilizes a jetting arrangement for the excavation process wherein there is provided a coupling system, a conduit system for conveying pressurized fluid such as water or the like, and a jetting system about the base of the apparatus for the jetting of the soil to the desired depth, and for circulating the pressurized fluid between the apparatus and the outer wall of the conductor pipe once the desired depth is reached and the cutting operation has begun.

REFERENCES:
patent: 4558744 (1985-12-01), Gibb
patent: 4900198 (1990-02-01), Hoaki

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