Acoustic borehole logging
Patent
·
OSTI ID:6470339
This patent describes an acoustic borehole logging method. It comprises traversing a borehole with a borehole logging tool containing a transmitter of acoustic energy having a free-field frequency spectrum with at least one characteristic resonant frequency of vibration and spaced-apart receiver, repeatedly exciting the transmitter with a swept frequency tone burst of a duration sufficiently greater than the travel time of acoustic energy between the transmitter and the receiver to allow borehole cavity resonances to be established within the borehole cavity formed between the borehole logging tool and the borehole wall, detecting acoustic energy amplitude modulated by the borehole cavity resonances with the spaced-apart receiver, and recording an amplitude verses frequency output of the receiver in correlation with depth as a log of the borehole frequency spectrum representative of the subsurface formation comprising the borehole wall.
- Assignee:
- Mobil Oil Corp., Fairfax, VA (USA)
- Patent Number(s):
- US 7962489; A
- Application Number:
- PPN: US s 7-501392
- OSTI ID:
- 6470339
- Country of Publication:
- United States
- Language:
- English
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