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Technique for running casing

Wells – Valves – closures or changeable restrictors
Patent

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Test valve having automatic bypass for formation pressure

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Tester valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Tester valve

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Tool for closing a production column in a well

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Patent

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Tool for closing a well tubing

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Tool for removing fluids and loose material from an earth format

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Tracked cable guide assembly and method for storing conductor ca

Wells – Valves – closures or changeable restrictors
Patent

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Travelling disc valve apparatus

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Travelling disc valve apparatus

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Tubing drain

Wells – Valves – closures or changeable restrictors – Destructible element
Patent

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Tubing fill and testing valve

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate

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Tubing fill and testing valve

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate

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Tubing hanger assembly and method of landing and locking

Wells – Valves – closures or changeable restrictors
Patent

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Tubing hanger having an integral valve gate

Wells – Valves – closures or changeable restrictors – Longitudinally movable operator
Reexamination Certificate

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Tubing pressure balanced well safety valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Tubing pressure insensitive control system

Wells – Valves – closures or changeable restrictors – Fluid operated
Reexamination Certificate

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Tubing retrievable variable setting differential pressure actuat

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Tubing shut off valve

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Tubing tester

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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