Mud turbine tachometer

Details Mud turbine tachometer Mud turbine tachometer

1983-09-30

1987-03-03

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324346, 324167, 324173, 324174, 175 45, E21B 2516, E21B 4702, G01P 352

Patent

active

046478531

ABSTRACT:
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.

REFERENCES:
patent: 2940039 (1960-06-01), Yost
patent: 3400327 (1968-09-01), Sexton
patent: 3611813 (1971-10-01), Brocker
patent: 3667042 (1972-05-01), Engel
patent: 4013945 (1975-05-01), Grosso
patent: 4013946 (1977-03-01), Lewis
patent: 4283679 (1981-08-01), Ito
patent: 4316144 (1982-02-01), Levijoki
patent: 4372398 (1983-02-01), Kuckes

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