G - Physics – 01 – V
Patent
G - Physics
01
V
324/9
G01V 3/30 (2006.01) E21B 47/12 (2006.01)
Patent
CA 2019515
METHOD OF REDUCING NOISE IN A BOREHOLE ELECTROMAGNETIC TELEMETRY SYSTEM Abstract of the Disclosure 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.
Klein James D.
Spies Brian R.
Atlantic Richfield Company
Klein James D.
Osler Hoskin & Harcourt Llp
Spies Brian R.
LandOfFree
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