4. Wells
  5. Pistons, fluid driven into well
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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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Sub-surface release plug assembly with primary and secondary rel

Wells – Pistons – fluid driven into well
Patent

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Subsurface well apparatus having flexing means and method of usi

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

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Surface controlled subsurface safety valve

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

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Surface deployed cement separation plug

Wells – Pistons – fluid driven into well
Reexamination Certificate

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Swabbing cup construction for swabbing an oil well pipe

Wells – Pistons – fluid driven into well
Patent

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System for controlling the flow of fluid in an oil well

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

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