Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Patent
1982-03-24
1987-09-08
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
367 25, 367 13, 324355, 324367, G01V 100, G01V 302, G01U 304, H04B 1700
Patent
active
046929088
ABSTRACT:
An acoustic method and apparatus for investigating an earth formation penetrated by a borehole are described. Acoustic transducers are mounted on a tool to accurately determine the distance between a segment of the tool and the wall of the borehole. The acoustic transducers are positioned in such manner that the stand-off distance between individual resistivity measuring electrodes in an array, which is also mounted on the tool segment, and the borehole wall can be measured. The stand-off measurement is recorded and may be used to correct the electrode resistivity measurements. In one embodiment a calibration of acoustic transducers as a function of depth is obtained by employing acoustic calibrating transducers to compensate for borehole environment effects on the performance of the acoustic transducers as well as determine the acoustic velocity of the borehole fluid, such as mud. Several embodiments are described.
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Ekstrom Michael P.
Havira R. Mark
Olsen Kenneth
Pihulic Daniel T.
Reens Louis H.
Schlumberger-Doll Research
Tarcza Thomas H.
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