4. Wells
  5. Pistons, fluid driven into well
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Pipe wipers and cups therefor

Wells – Pistons – fluid driven into well
Patent

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Plug and plug set for use in wellbore

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Plug for use in wellbore operations and apparatus for...

Wells – Pistons – fluid driven into well – Surrounding conduit valve or closure opened by piston
Reexamination Certificate

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Plunger lift method and apparatus

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Plunger lift with multipart piston and method of using the same

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Pump out sub

Wells – Pistons – fluid driven into well – With stop
Patent

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Pump plug for use in well operations

Wells – Pistons – fluid driven into well
Patent

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Pump-down sand washing tool

Wells – Pistons – fluid driven into well – With stop
Patent

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Pumpdown safety valve

Wells – Pistons – fluid driven into well – With downflow past piston
Patent

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Reinforced seal unit for pumpdown pistons or well swabs

Wells – Pistons – fluid driven into well
Patent

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Releasable well tool stopping devices and systems

Wells – Pistons – fluid driven into well – With stop
Patent

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Remote cementing plug launching system

Wells – Pistons – fluid driven into well – With downflow past piston
Patent

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Seal assembly for fluid injection pump-down tools

Wells – Pistons – fluid driven into well – With stop
Patent

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Self-aligning well apparatuses and anti-rotation device for well

Wells – Pistons – fluid driven into well – With stop
Patent

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Self-anchoring cementing wiper plug

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Stage cementing apparatus

Wells – Pistons – fluid driven into well – Surrounding conduit valve or closure opened by piston
Patent

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Stage cementing tool

Wells – Pistons – fluid driven into well – Surrounding conduit valve or closure opened by piston
Patent

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Sub-surface release plug assembly

Wells – Pistons – fluid driven into well
Patent

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Sub-surface release plug assembly

Wells – Pistons – fluid driven into well
Patent

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Sub-surface release plug assembly with non-metallic components

Wells – Pistons – fluid driven into well
Patent

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