Method and apparatus for combined cement bond and acoustic well

Details Method and apparatus for combined cement bond and acoustic well Method and apparatus for combined cement bond and acoustic well

1981-08-31

1985-01-22

Wilbur, Maynard R.

Communications, electrical: acoustic wave systems and devices

Borehole testing

367 26, 367 28, 181105, G01V 140

Patent

active

044956061

ABSTRACT:
Method and apparatus are provided for measuring acoustic signals having amplitudes of widely varying magnitude during one traversal of the borehole corresponding to indications of cement bonding along a casing as well as acoustic travel time through an increment of the formation. Variable attenuators are provided associated with acoustic receivers disposed within the logging sonde wherein attenuation may be automatically adjusted as a function of acoustic transmitter-receiver trigger pulses transmitted downhole, depending upon whether a cement bond or other log of acoustic signal information having a substantially different magnitude is desired.

REFERENCES:
patent: 3182286 (1965-05-01), Zimmerman et al.
patent: 3195105 (1965-07-01), Brokaw
patent: 3257639 (1966-06-01), Kokesh
patent: 3292146 (1966-12-01), Dewan
patent: 3456754 (1969-07-01), Zemanek
patent: 3618001 (1971-11-01), Zill et al.
patent: 3691518 (1970-04-01), Schuster
patent: 4346460 (1982-08-01), Schuster

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