Mud pressure control system with magnetic torque transfer

Details Mud pressure control system with magnetic torque transfer Mud pressure control system with magnetic torque transfer

1981-08-24

1989-01-31

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

175 48, 33306, G01V 140

Patent

active

048021504

ABSTRACT:
A down-hole signal generator for a mud-pulse telemetry system comprises a flow constrictor defining a throttle orifice for the mud passing along a drill string, a throttling member displaceable with respect to the throttle orifice to modulate the mud pressure for the purpose of transmitting measurement data up the drill string, and a turbogenerator. The turbogenerator incorporates an annular impeller surrounding a casing and arranged to be driven by the mud passing along the drill string, and a rotatable magnet assembly disposed in a mud-free environment within the casing. The impeller includes an electrically conductive drive ring and the rotatable magnet assembly includes rare earth magnets, so that, when the impeller is rotated by the mud flow, eddy currents are induced in the drive ring by the magnetic field associated with the magnets and the magnet assembly is caused to rotate with the impeller by virtue of the interaction between the magnetic field associated with the magnets and the magnetic field associated with the induced currents. In this manner torque may be imparted to an electrical generator within the casing without a rotating seal having to be provided between the impeller and the generator.

REFERENCES:
patent: Re30246 (1980-04-01), Richter et al.
patent: 2700131 (1955-01-01), Otis et al.
patent: 3867714 (1975-02-01), Patton
patent: 3983948 (1976-10-01), Jeter
patent: 3997869 (1976-12-01), Claycomb
Hirosura et al., "Results of Geothermal . . . Development", 9/27/79, Geotherm Resources Mtg, vol. 3, pp. 307-312, abst. only provided.

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