Balanced isolation tool enabling clean fluid in tubing perforate

Details Balanced isolation tool enabling clean fluid in tubing perforate Balanced isolation tool enabling clean fluid in tubing perforate

1986-03-31

1987-05-12

Novosad, Stephen J.

Wells

Means for perforating, weakening, bending or separating pipe...

With disparate below ground feature

175 456, E21B 43116

Patent

active

046641840

ABSTRACT:
In tubing conveyed perforating well completion operations, shaped charge detonation is achieved by dropping a detonating bar in the tubing string. Velocity of the detonating bar is controlled by placing a column of standing fluid above the tubing conveyed perforating assembly. This apparatus and method isolate a column of standing fluid. Moreover, invasion by a well fluid is prevented to assure that the retardation characteristics of the standing fluid are not changed by invading well fluids. The apparatus includes a tubing string pressure isolation piston assembly slidable within a sleeve and a frangible closure disk broken by the detonating bar; the isolation tool further includes check valve means controllably venting fluid pressure across the valve means.

REFERENCES:
patent: 2760408 (1956-08-01), Taylor
patent: 4498541 (1985-02-01), Brieger et al.
patent: 4541486 (1985-09-01), Wetzel et al.
patent: 4557331 (1985-12-01), Stout

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