Signal transmitters

Details Signal transmitters Signal transmitters

1988-12-19

1990-09-11

Steinberger, Brian S.

Communications, electrical: acoustic wave systems and devices

Wellbore telemetering

Through well fluids

G01V 100

Patent

active

049568230

ABSTRACT:
A transmitter comprises an impeller assembly rotatable by a liquid flow, and an electrical generator having a stator and a rotor arranged to be driven by the impeller assembly. The impeller assembly comprises a main impeller portion and a secondary impeller portion angularly displaceable relative to one another about the axis of rotation of the impeller assembly in response to a change in load of the generator so as to vary the pressure drop across the rotating impeller assembly. Thus appropriate variation of the load of the generator may be used to control the impeller assembly in such a manner as to transmit pressure signals within the liquid flow. Such a transmitter is particularly suitable for transmitting measurement data to the surface from a measuring instrument at the end of a drill string within a borehole. Furthermore such a transmitter can be constructed so as to be readily retrievable without requiring withdrawal of the drill string from the borehole.

REFERENCES:
patent: Re30055 (1979-07-01), Claycomb
patent: 4785300 (1988-11-01), Chin et al.

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