Acoustic well logging with energy level detection

Details Acoustic well logging with energy level detection Acoustic well logging with energy level detection

1981-02-02

1984-05-01

Wilbur, Maynard R.

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Well logging

367 98, G01V 140

Patent

active

044465408

ABSTRACT:
A well logging method and apparatus for detecting the first arrival of an acoustic wave in a logging signal under adverse signal conditions. The received acoustic signal is amplified at a fixed gain until clipped at the largest amplitude throughout the logging procedure. This amplified signal is converted RMS to DC level signal and stored in sample and hold means for a period shortly before first arrival of the acoustic wave. The continuing DC level signal and the stored DC level signal are compared to produce a comparator output DC signal when the continuing DC signal has a certain increased magnitude. This certain increased magnitude is used to generate a pulse of given magnitude and duration that is especially suitable in digital data systems.

REFERENCES:
patent: 3289157 (1966-11-01), Brokaw
patent: 3622963 (1971-11-01), Sage
patent: 4040001 (1977-08-01), Vivet et al.
patent: 4106016 (1978-08-01), Cerra et al.
patent: 4168483 (1979-09-01), Parthasarathy et al.
patent: 4210965 (1980-07-01), Ingram
patent: 4349896 (1982-09-01), Hall, Jr.

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