Acoustic well logging with threshold adjustment

Details Acoustic well logging with threshold adjustment Acoustic well logging with threshold adjustment

1978-05-19

1979-10-23

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 28, G01V 140

Patent

active

041722507

ABSTRACT:
Acoustic well-logging methods and apparatus are provided for investigating earth formations traversed by a borehole. Acoustic waves are transmitted from different points in the borehole and received at other points in the borehole, and a reception signal is generated representative of the received acoustic waves. The time interval between the instant the measurement waves are transmitted and the instant the instantaneous amplitude of the reception signal exceeds a given detection threshold for the first time is measured as a function of depth and the value of the detection threshold is adjusted during each measurement sequence in accordance with the amplitude of the noise received during the next preceding listening interval.

REFERENCES:
patent: 3177467 (1965-04-01), Brokaw
patent: 3289157 (1966-11-01), Brokaw
patent: 3437834 (1969-04-01), Schwartz
patent: 3475685 (1969-10-01), Covill
patent: 3576564 (1971-04-01), Galvin
patent: 3609366 (1971-09-01), Schwartz
patent: 3944942 (1976-03-01), Chudleigh

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