4. Valves and valve actuation
  5. Blow-out preventers

Gary D. Ellis

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Blowout preventer

Valves and valve actuation – Blow-out preventers
Patent

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Isolation valve with frangible flapper element

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

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Subsurface tubing hanger and stinger assembly

Wells – Expansible anchor or casing – Fluid pressure actuated
Patent

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Subsurface tubing hanger and stinger assembly

Wells – Processes – Placing or shifting well part
Patent

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System and method for monitoring packer slippage

Communications: electrical – Wellbore telemetering or control – Including particular sensor
Reexamination Certificate

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Profile ID: LFUS-PAI-P-108084

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