US Patent 6957699 Downhole shut-in tool
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Patent abstract
The invention provides a downhole shut-in tool for obtaining formation pressure data. The tool includes a fast-closing main valve and a pressure-relief valve operable between open and closed positions to effect periodic sealing and release of formation pressure with respect to the surface.
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Patent Inventor Names
Boris Timoffee0
Paul John Feluch0
Date of Patent
October 25, 2005
0Patent Application Number
104352620
Date Filed
May 12, 2003
0Patent Primary Examiner
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US Patent 6957699 Downhole shut-in tool
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