4. Wells
  5. Packers or plugs
  6. With expanding anchor

Paul M. Helderle

Inventor

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Annular safety assembly for an oil well, especially a double pro

Wells – Packers or plugs – With expanding anchor
Patent

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Device for controlling a safety valve disposed below an activati

Wells – With eduction pump or plunger – Having sediment trap or deflector
Patent

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Hydraulically controlled safety valves for incorporation in prod

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

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Safety valves for wells

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

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Sliding-sleeve valve for an oil well

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

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Profile ID: LFUS-PAI-P-826542

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