Acoustic well logging with threshold adjustment

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

1974-12-02

1977-08-02

Birmiel, Howard A.

Communications: electrical

Selective

Having electron beam device

328165, 328168, 340 155AC, 340 155GC, G01V 140

Patent

active

040400018

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: 3289157 (1966-11-01), Brokaw
patent: 3437834 (1969-04-01), Schwartz
patent: 3475685 (1969-10-01), Covill
patent: 3576564 (1971-04-01), Galven
patent: 3618001 (1971-11-01), Zill et al.
patent: 3676842 (1972-07-01), Lee
patent: 3728672 (1973-04-01), Dennis et al.
patent: 3828262 (1974-08-01), Trocqueme
patent: 3832577 (1974-08-01), Harr
patent: 3944942 (1976-03-01), Chudleigh, Jr.

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