4. Wells
  5. Pistons, fluid driven into well
  6. Surrounding conduit valve or closure opened by piston
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Activating ball assembly for use with a by-pass tool in a...

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

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Apparatus for well cementing through a tubular member

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

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Cementing collar and method of operation

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

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Downhole surge tools

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

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Hydraulic lock alleviation device, well cementing stage tool, an

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

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Method and apparatus for the multiple stage cementing of a casin

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

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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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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
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