Down hole tool with adjustable fluid viscosity
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United States of America Patent
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May 21, 2013
Grant Date -
Jan 29, 2009
app pub date -
Jul 17, 2008
filing date -
Jul 25, 2007
priority date (Note) -
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Abstract
A down hole tool includes a tool body, a fluid cavity, a magnetorheological fluid disposed in the fluid cavity, and an electrical control unit in communication with the MR fluid. The electrical control unit is configured to adjust a viscosity of the MR fluid by varying a magnetic field.
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