Mud turbine tachometer

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G - Physics

01

P

73/62

G01P 3/48 (2006.01) E21B 47/00 (2006.01) G01P 3/487 (2006.01)

Patent

CA 1222882

-21- MUD TURBINE TACHOMETER Abstract of the Disclosure: In an MWD measurement system, the speed of rotation of a downhole turbine is measured by the interaction of a triaxial magnetometer in a sensor package and a permanent magnet attached to the turbine shaft. The triaxial magnetometer may be part of an existing MWD system for measuring borehole directional parameters. The magnet is a strong magnet mounted on the turbine shaft perpendicular to the axis of the turbine and the axis of the drill string.

464440

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