Method of reducing noise in a borehole electromagnetic telemetry

Details Method of reducing noise in a borehole electromagnetic telemetry Method of reducing noise in a borehole electromagnetic telemetry

1989-07-31

1990-12-25

Jordan, Charles T.

Communications: electrical

Wellbore telemetering or control

Using a specific transmission medium

340855, 175 40, 166 66, 324351, G01V 100

Patent

active

049806823

ABSTRACT:
A borehole telemetry system has a transmitter located in the borehole, a surface receiver, and surface signal sensors for receiving the transmitted signal. There are usually plural sources of electromagnetic noise at a well site which degrade the usefulness of the telemetry system. The method places noise sensors where the reception of noise is maximized. Simultaneous measurements are taken of the ambient noise with the noise sensors and the signal sensors. The relationship between the measurements of the noise and signal sensors is determined. The transmitted signal is then received by the signal sensors and simultaneous measurements of the ambient noise are made by the noise sensors. The noise portion of the transmitted signal as received by the signal sensors is determined from the simultaneous noise measurements and the determined relationship. A received signal having reduced noise is then produced by removing the noise portion.

REFERENCES:
patent: 2544569 (1951-03-01), Silverman
patent: 3638105 (1972-01-01), Schuster
patent: 4339720 (1982-07-01), Halverson
patent: 4691203 (1987-09-01), Rubin et al.
patent: 4812766 (1989-03-01), Klein
patent: 4837514 (1989-06-01), Spies

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