Shear wave acoustic logging system
In the acoustic logging of a liquid-filled well penetrating a subterranean formation, the method is described comprising: (a) lowering within the well a well logging tool having a bender-type first transducer with opposed unrestricted piezoelectric planar surfaces oriented along the axis of the logging tool; (b) locating within the logging tool at least one second transducer spaced longitudinally along the logging tool from the first transducer; (c) continuously pulling the logging tool upwardly through the well; (d) exciting the bender-type first transducer while it is being pulled through the well by applying voltage spikes at a select repetition rate to the opposed planar surfaces to cause the opposed planar surfaces to resonate in response to each voltage spike and thereby generate in the liquid-filled well repetitive. Asymmetric acoustic radiation patterns are comprised of a positive pressure wave in one direction and a simultaneous negative pressure wave in the opposite direction. The asymmetric radiation patterns are converted to shear waves at the interface between the well and the formation surrounding the well.
- Assignee:
- Mobil Oil Corp., New York, NY
- Patent Number(s):
- US 4649525
- OSTI ID:
- 6693117
- Resource Relation:
- Patent File Date: Filed date 22 Aug 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
OIL WELLS
SONIC LOGGING
WELL LOGGING EQUIPMENT
ASYMMETRY
ELECTRIC POTENTIAL
EXCITATION
HOISTING
MONITORING
PIEZOELECTRICITY
PRESSURE EFFECTS
SEISMIC S WAVES
SURFACES
TRANSDUCERS
WAVE PROPAGATION
ELECTRICITY
ENERGY-LEVEL TRANSITIONS
EQUIPMENT
MATERIALS HANDLING
SEISMIC WAVES
WELL LOGGING
WELLS
020200* - Petroleum- Reserves
Geology
& Exploration