Discrete-frequency multipole sonic logging methods and apparatus
This patent describes a method of borehole logging, comprising the steps of: emitting sonic energy from a multipole source at a first location in a borehole, the sonic energy being of at least one discrete frequency which induces propagation of multipole sonic waves in the wall of the borehole; receiving sonic energy of the multipole sonic waves at multiple receiver locations in the borehole to produce a received sonic signal for each location, the multiple receiver locations being spaced apart from one another and from the first location; for each the receiver location, detecting the complex values of the received sonic signal; and processing the detected complex values of the received sonic signals to determine phase velocity of the multipole sonic waves in the borehole as a function of frequency.
- Assignee:
- Schlumberger Technology Corp., New York, NY (United States)
- Patent Number(s):
- US 5077697; A
- Application Number:
- PPN: US 7-513319
- OSTI ID:
- 5644168
- Resource Relation:
- Patent File Date: 20 Apr 1990
- Country of Publication:
- United States
- Language:
- English
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