System containing expendible isolation valve with frangible seal

Details System containing expendible isolation valve with frangible seal System containing expendible isolation valve with frangible seal

1991-05-10

1993-02-23

Neuder, William P.

Wells

Processes

Destroying or dissolving well part

166 51, 166325, E21B 4304, E21B 3406

Patent

active

051881829

ABSTRACT:
An isolation valve for a downhole well completion system having a one piece frangible, ceramic sealing element and an extrusion resistant resiliently faced valve seat and a method for the use thereof is presented. Said sealing element is biased to the closed position and rotatable within a sealing element chamber from an open position during run in to a closed position as a result of the withdrawal of a wash pipe and a protector tube from the valve bore. Said frangible sealing element cooperates with said extrusion resistant valve seat to provide a reliable pressure resistant seal. After recovery of completion fluids from the well bore and pressure testing of the production string, the frangible sealing element is shattered by impacting with a tooth-faced blind box hammer.

REFERENCES:
patent: 4154303 (1979-05-01), Fournier
patent: 4160484 (1979-07-01), Watkins
patent: 4378847 (1983-04-01), Patel et al.
patent: 4423773 (1984-01-01), Stout
patent: 4433702 (1984-02-01), Baker
patent: 4541484 (1985-09-01), Salerni et al.
patent: 4597445 (1986-07-01), Knox
patent: 4691775 (1987-09-01), Lustig
patent: 4716968 (1988-01-01), Pringle
patent: 4813481 (1989-03-01), Sproul et al.

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