Annular sealing element with self-pivoting inserts for blowout p

Details Annular sealing element with self-pivoting inserts for blowout p Annular sealing element with self-pivoting inserts for blowout p

1990-10-18

1992-05-26

Fox, John C.

Valves and valve actuation

Blow-out preventers

Deformable annulus

E21B 3306

Patent

active

051160170

ABSTRACT:
An improved annular sealing element for oil well blowout preventers includes a plurality of curved metal segments spaced apart at regular circumferential angles and imbedded in a resilient matrix forming a generally lenticular-shaped body with a hollow central bore. Each segment has a tooth-like upper plate section having a downwardly depending web which is pivotably joined to the upper surface of a wedge-shaped base plate. Pivotability in a vertical plane of the upper plate section relative to the base plate limits the force exertable by the sealing element on a drill string component within the bore of the element. A cylindrical pivot bar formed in the lower surface of the base plate of each segment is adapted to roll or self-pivot on the annular head of a driver piston, thus allowing the sealing element to be installed in existing blowout preventers without modification of the driver piston.

REFERENCES:
patent: 3561723 (1971-02-01), Cugini
patent: 4949785 (1990-08-01), Beard et al.

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