4. Measuring and testing
  5. Borehole or drilling
  6. Downhole test

James M. Upchurch

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Annulus pressure controlled reversing valve

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

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Drill stem testing apparatus with multiple pressure sensing port

Measuring and testing – Borehole or drilling – Downhole test
Patent

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Full bore sampler valve

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

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Full bore sampler valve apparatus

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

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Inflatable packer drill stem testing system

Wells – With eduction pump or plunger – With packer or plug
Patent

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Profile ID: LFUS-PAI-P-172497

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