High pressure packer for a drop-in check valve

Details High pressure packer for a drop-in check valve High pressure packer for a drop-in check valve

1993-08-09

1994-09-06

Bui, Thuy M.

Brushing, scrubbing, and general cleaning

166165, 166196, 166325, F21B 3312

Patent

active

053439465

ABSTRACT:
A packer assembly for a drop-in check valve includes a series of stacked rings in the annulus between the housing of the drop-in check valve assembly and the surface of the bore of the landing sub. The rings include at least two elastomer rings of different hardness. The top elastomer ring is capped off by a multi-part metal ring assembly comprising oppositely facing inner and outer L-shaped rings and a central T-shaped ring. The inner and outer rings have their vertical legs vertically located against the respective adjoining annulus walls and their horizontal legs in line. The trunk of the T-shaped ring is in the gap between the horizontal legs and in contact therewith so that when the elastomer ring radially expands, the metal of the metal rings is maintained in metal-to-metal contact across the annulus. This seals the annulus and prevents extrusion by eliminating all gaps. The lower elastomer ring can likewise be capped by a similar three-part metal ring assembly. An additional horizontal surface ring is located below the multi-part ring to even the upward pressure. A coil spring or an expansion band can also be used as an anti-extrusion ring with respect to the bottom surface of the lower elastomer ring.

REFERENCES:
patent: 4258926 (1981-03-01), Upton
patent: 4372390 (1983-02-01), Baugh et al.
patent: 4399871 (1983-08-01), Adkins et al.
patent: 4450914 (1984-05-01), Elphick
patent: 4745972 (1988-05-01), Bell et al.
patent: 5058671 (1991-10-01), Cochran
patent: 5103904 (1992-04-01), Luke et al.
Hydril Drill Stem Valves, Catalog 9106, dated 1991, pp. 13-19.

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