4. Wells
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Full-bore well tester with hydrostatic bias

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

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Full-opening annulus pressure operated sampler valve with revers

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

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Fully recoverable drilling control pod

Wells – Submerged well – Connection or disconnection of submerged members remotely...
Reexamination Certificate

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