Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Well logging
Reexamination Certificate
2005-05-10
2005-05-10
Tarcza, Thomas H. (Department: 3663)
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Well logging
C367S029000, C367S035000, C367S127000, C181S105000
Reexamination Certificate
active
06891777
ABSTRACT:
Methods for processing ultrasonic signal data to evaluate subsurface properties and tool orientation. Acoustic signals are transmitted into a plurality of azimuthal borehole positions. Formation echo signal transit time distributions are then determined in a plurality of azimuthal sectors for the acoustic signals. Front face echo signal transit times are also measured and farther-mode and closer-mode transit times are determined for the distribution of formation echo signals. Farther and closer tool standoffs are determined for the azimuthal sectors and a borehole diameter is determined from a summation including standoffs in opposing sectors. The standoffs are also used to determine a preferential tool position.
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Pabon Miguel F.
Sloan W. Robert
Echols Brigitte L.
Hughes Scott
Schlumberger Technology Corporation
Segura Victor H.
Tarcza Thomas H.
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