Method and apparatus for multipole acoustic logging

Patent · Tue Aug 21 04:00:00 EDT 1990

OSTI ID:6505484

Chang, S K; Froelich, B G; Varga, G

This patent describes a logging tool for use in a borehole traversing an earth formation, the tool having a multiple dipole source connected to the tool in a fixed position and orientation to generate shear wave radiation in multiple directions in the formation upon excitation. It comprises: generating shear wave radiation in a first direction; receiving at each detector at least a portion of the generated shear wave in a second and a third direction; generating shear wave radiation in a fourth direction; receiving at each detector at least a portion of the generated shear wave in a fifth and a sixth direction; determining, for each detector, a composite dipole waveform for azimuthal directions based on at least a portion of the received waveforms in the second, third, fifth and sixth directions received at each detector; determining for each azimuthal direction, a shear wave velocity based on the composite dipole waveforms determined for each azimuthal direction; and obtaining the magnitude and direction of formation anisotropy, relative to the position of the logging tool.

• Assignee: Schlumberger Technology Corp., New York, NY (USA)
• Patent Number(s): A; US 4951267
• Application Number: PPN: US s 6-919293
• OSTI ID: 6505484
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
ACOUSTIC MONITORING
BOREHOLES
CAVITIES
DIPOLES
EQUIPMENT
MONITORING
MULTIPOLES
NATURAL GAS WELLS
OIL WELLS
SHEAR
WAVE PROPAGATION
WELL LOGGING EQUIPMENT
WELLS