Surge reduction bypass valve
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United States of America Patent
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Nov 27, 2007
Grant Date -
Jan 19, 2006
app pub date -
Jun 27, 2005
filing date -
Jul 16, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and apparatus are provided for reducing surge pressure while running casing into a wellbore. The apparatus includes a running string for running casing having a diverter tool therein. The diverter tool has one or more bypass ports between its upper and lower end which are normally closed. In operation, the diverter tool is automatically cycled between the open and closed positions of the bypass ports during a casing running operation. A pressure event inside the diverter tool deactivates the cyclic opening and closing function of the bypass port.
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