Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1991-07-19
1993-02-02
Dang, Hoang C.
Wells
Valves, closures or changeable restrictors
Fluid operated
137460, 137498, 166320, 166322, E21B 3408
Patent
active
051831155
ABSTRACT:
Disclosed is a new and novel poppet type safety valve useful in flow conduits in fluid storage well systems. The safety valve is programmable to automatically close at various predetermined ratios of production mass flow rate-ambient pressure to prevent undesirable high flow rates or uncontrolled out-flow of fluid stored in a reservoir if the flow conduit or wellhead is damaged. This safety valve is lowered into and locked and sealed in a landing nipple in the well conduit. The safety valve has a variable bias which biases the valve member toward open position and a variable flow restrictor which is automatically actuated by a sensing actuator continually sensing reservoir pressure to vary the restricted annular flow area between the valve housing and inside of the well conduit for closure at the desired flow rate. The valve element has a through flow passage with locking recesses in the flow passage into which the sensing actuator may be releasably locked. The sensing actuator responds to changes in stored gas density and ambient pressure and automatically varies the restricted flow area accordingly. The safety valve may be operated to disconnect the valve housing, with or without the sensing actuator, for expending downwardly in the well conduit.
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"Otis Products and Services" OEC 5516, Sep., 1989, p. 142.
Cox Roland O.
Dang Hoang C.
Otis Engineering Corporation
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