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Safety plug for sealing-off the tubing of a producing oil or gas

Wells – Packers or plugs – Controllable passage through packer
Patent

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Sealing feed through lines for downhole swelling packers

Wells – Packers or plugs – Controllable passage through packer
Reexamination Certificate

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Standing valve assembly

Wells – Packers or plugs – Controllable passage through packer
Patent

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Subterranean well pressure surging tool

Wells – Packers or plugs – Controllable passage through packer
Patent

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Subterranean well safety valve with reference pressure chamber

Wells – Packers or plugs – Controllable passage through packer
Patent

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System and method for fluid control in expandable tubing

Wells – Packers or plugs – Controllable passage through packer
Reexamination Certificate

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