SP noise cancellation technique

Details SP noise cancellation technique SP noise cancellation technique

1991-05-08

1993-07-20

Lobo, Ian J.

Communications: electrical

Wellbore telemetering or control

Diagnostic monitoring or detecting operation of...

3408554, 324351, 367 25, 367 45, G01V 140, G01V 300

Patent

active

052297659

ABSTRACT:
An adaptive transversal filter is incorporated with an SP conductor extending through a logging cable to the surface from an SP electrode supported on a sonde. This logging cable is operated in a noisy environment and there is the risk of noise on the logging cable obscuring the SP signal. The SP signal is obtained at the surface and is passed through a filter system. One input to the filter system utilizes an AC ammeter connected to the AC power source for the logging cable and that signal is input to a multi-stage adaptive transversal filter. The filter output is a recreation of the noise imposed on the SP conductor and when summed with the SP output signal, provides a signal which is substantially noise free.

REFERENCES:
patent: 4415895 (1983-11-01), Flagg
patent: 4451790 (1984-05-01), Bravenec
patent: 4604738 (1986-08-01), Aggarwal et al.
patent: 4750156 (1988-06-01), Abrams et al.
patent: 4757516 (1988-07-01), Yoshimoto et al.
patent: 4980682 (1990-12-01), Klein et al.

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