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US 4,283,039 AGranted
Annular blowout preventer with upper and lower spherical sealing surfaces
AssigneeNL Industries, Inc.
InventorsGary R. Schaeper, Richard A. Olson
Life of this patent
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AssigneeNL Industries, Inc.
InventorsGary R. Schaeper, Richard A. Olson
Estimating the term…
An annular blowout preventer for use on an oil or gas well rig having a lower housing, an upper housing, a resilient sealing means, a vertical bore coaxially positioned through the housing and a vertically acting piston for actuating the sealing means in which the inner surface of the upper housing and the inner surface of the lower housing are concentric spherical surfaces extending to the bore. The resilient sealing means includes steel segments extending between the top and bottom of the sealing means and the top and bottom of the sealing means and the steel segments have spherical surfaces coacting with the spherical surfaces on the upper and lower housings. The upper and lower housings each include a vertical wall extending downwardly from the spherical surfaces on the upper and lower housing and the vertical moving piston sealingly engages the vertical walls.
In a blowout preventer adapted for use on an oil or gas well rig having a lower housing, an upper housing, a resilient sealin means positioned between the housings, and piston means for actuating said sealing means, the improvement comprising,
In a blowout preventer adapted for use on an oil or gas well rig having a lower housing, an upper housing, a resilient sealing means positioned between the housings, a vertical bore coaxially positioned through the housings, and vertically acting piston means for actuating said sealing means, the improvement comprising,
Dependencies are inferred from the claim text.