Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1996-02-01
1999-01-26
Bagnell, David J.
Wells
Valves, closures or changeable restrictors
Fluid operated
1663328, F21B 3410
Patent
active
058628649
ABSTRACT:
A subsurface safety valve includes a one piece pressure housing having a flow passage provided therethrough and a recess formed in a side wall of the flow passage. A flapper member having first and second, respectively open and closed positions, is mounted to the housing in the recess. A control mechanism controls movement of the flapper member between its first and second positions. The control mechanism may include at least one piston substantially longitudinally aligned with flow passage wall, the at least one piston being positioned in longitudinal relation to a portion of a surface of the wall, the surface of the wall being provided with a longitudinal groove and the at least one piston being provided with a protrusion which is received within the longitudinal groove.
REFERENCES:
patent: 4415036 (1983-11-01), Carmody et al.
patent: 4427071 (1984-01-01), Carmody
patent: 4601341 (1986-07-01), Pringle et al.
patent: 4629002 (1986-12-01), Pringle
patent: 5058682 (1991-10-01), Pringle
Bagnell David J.
Petroleum Engineering Services Limited
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