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  6. Operating valve, closure, or changeable restrictor in a well
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Downhole tubing conveyed valve

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent

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Downhole valve

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate

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Downhole valve device

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate

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Dual action valve including a built in hydraulic circuit

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent

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Dual action valve including at least two pressure responsive mem

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent

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Dual flapper valve assembly

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent

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Dual hydraulic safety valve

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent

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Dual valve well control in underbalanced wells

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate

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Dynamic mudcap drilling and well control system

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Reexamination Certificate

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