Bi-directional fluid loss device and method

Details Bi-directional fluid loss device and method Bi-directional fluid loss device and method

2007-08-07

2007-08-07

Bagnell, David (Department: 3672)

Wells

Processes

Placing or shifting well part

C166S332800, C166S319000, C166S324000, C166S332100

Reexamination Certificate

active

11048585

ABSTRACT:
A fluid loss device including a flapper and seat assembly that provide a seal on a lower flapper surface when the flapper is closed and resists pressure in either direction. The flapper and seat assembly is spring biased to contact a flapper support above the flapper to resist deformation of the flapper due to a pressure differential from below the flapper. The flapper and seat assembly may be moved by tubing pressure to release an opening prop that opens the flapper. The valve seat may include an elastomeric seal element to improve the fluid flow restriction. The flapper and seat assembly is also biased upward by a pressure differential from below to above the flapper, to thereby increase the flapper to valve seat pressure as the fluid pressure differential increases.

REFERENCES:
patent: 4478286 (1984-10-01), Fineberg
patent: 5884705 (1999-03-01), Hill, Jr.
patent: 6079497 (2000-06-01), Johnston et al.
patent: 6230808 (2001-05-01), French et al.
patent: 6808020 (2004-10-01), Garcia et al.
patent: 2003/0079880 (2003-05-01), Deaton et al.
patent: 2006/0196675 (2006-09-01), Patel et al.

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