Wells – Valves – closures or changeable restrictors – Fluid operated
Patent
1986-09-11
1987-12-22
Novosad, Stephen J.
Wells
Valves, closures or changeable restrictors
Fluid operated
166324, E21B 3406
Patent
active
047141166
ABSTRACT:
An oil well downhole safety valve is operated using annulus pressure. The device includes a tool body having a continuous wall defining a flow bore for conveying liquid, the tool body being adapted to travel through a well annulus as part of a work string. A valve body is slidably mounted within the tool body bore. Annular seals carried on the external surface of the valve body form a seal between the valve body and the continuous wall of the tool body. At least one opening is provided through the tool body for allowing annulus pressure to communicate with the flow bore. A valving member is carried by the valve body and is movable between open flow and closed flow positions for valving the flow of fluid through the flow bore. Piston drives, operated by annulus pressure, move the valving member between open flow and closed flow positions. The apparatus can include a spring carried by the tool body for biasing the valving member to an open flow position. The preferred construction provides opposing pistons of differing surface areas, sealed from each other, but connected by a passive connector and balanced with the spring for predetermined pressure conditions. The valve can be manufactured with different surface areas and spring tension values depending upon the environmental conditions of usage and the pressure and flow conditions of a particular well.
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Halliburton Services-Technical Data Sheet, (pp. 21-24).
Melius Terry Lee
Novosad Stephen J.
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