4. Wells
  5. Processes
  6. Freeing stuck object, grappling or fishing in well

Donald F. Hushbeck

Inventor

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Annulus pressure operated closure valve with improved reverse ci

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

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Circulation valve

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

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Circulation valve

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

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Downhole tool apparatus and method of limiting packer element ex

Wells – Processes – Placing or shifting well part
Patent

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Downhole tool apparatus with non-metallic components and methods

Wells – Packers or plugs – With expanding anchor
Patent

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Profile ID: LFUS-PAI-P-94112

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