Force-limiting/wear compensating annular sealing element for blo

Details Force-limiting/wear compensating annular sealing element for blo Force-limiting/wear compensating annular sealing element for blo

1989-05-02

1990-08-21

Bui, Thuy M.

Wells

Above ground apparatus

With seal for reciprocating member

166196, 277235R, 251 12, E21B 3306

Patent

active

049497855

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 which has a convex upper, outer surface adapted to slide upwards on the concavely curved inner wall surface of a blowout preventer cavity. Each upper tooth-like plate section has a downwardly depending web which is vertically pivotably supported within a groove formed in the upper surface of a wedge-shaped base plate at the bottom of the lenticular body. The inner toe portion of each base plate is imbedded in the resilient matrix, while the rear, heel portion of each base plate, which has a convexly curved lower surface, protrudes through the matrix. Pivotability of the upper portion of each segment relative to the base plate limits the force exertable by the element on a drill string component. Upward pivotal motion of the heel portion of the base plate feeds resilient material upwards and radially inwards to compensate for wear of resilient material in the vicinity of the bore walls.

REFERENCES:
patent: 3323773 (1967-06-01), Walker
patent: 3561723 (1971-02-01), Cugini
patent: 3667721 (1972-06-01), Vujasinovic
patent: 4602794 (1986-07-01), Schaeper et al.
patent: 4605195 (1986-08-01), Burton et al.

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