Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1996-05-28
1997-11-04
Ferensic, Denise L.
Fluid handling
Line condition change responsive valves
Direct response valves
1663328, F16K 1500
Patent
active
056829213
ABSTRACT:
The invention relates to a pair of matched surfaces usable in sealing a downhole subsurface safety valve. The continuous seat and the matching flapper profile feature a surface that is around its periphery transverse to the longitudinal axis of the seat and the flapper. The seating surface, if extended in a two-dimensional plane, defines an undulating shape which can be a sinusoidal shape in the preferred embodiment. The result is an improvement in the performance of the metal-to-metal contact between the seat and the flapper, coupled with a self-centering effect when the seating surface on the flapper, which is formed adjacent a shoulder, is presented in opposition to the seat. Additionally, the transverse undulating seat can have an embedded groove which accommodates a resilient seal, preferably PTFE or Teflon.RTM..
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Tim Walker, et al., Downhole Swab Valve Aids in Underbalanced Completion of North Sea Well, SPE 30421, Society of Petroleum Engineers, Inc., 1995, 3 pages.
Tim Walker, et al., Underbalanced Completions Improve Well Saftey and Productivity, World Oil, Nov. 1995, 4 pages.
Beall Clifford H.
Megill Mark S.
Rawson Michael S.
Trott Doug
Baker Hughes Incorporated
Farid Ramyar M.
Ferensic Denise L.
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