Dipole array acoustic logging instrument
A sonic logging tool and logging tool technology, applied in the field of exploration technology and equipment, can solve the problems of high logging cost, unlaunched tools, and difficulty in promoting the application of tool logging
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[0030] The technical solution of the present invention will be described in detail below in conjunction with the drawings.
[0031] The theoretical basis of dipole sonic logging measurement of formation shear wave velocity is that when the frequency of the flexural wave in the borehole acoustic field is low enough (the frequency in the borehole is about 1k-4kHz), the wave velocity is similar to the formation shear wave velocity. Therefore, dipole acoustic logging uses a dipole sound source to excite the low-frequency borehole flexural wave (flexural wave mode), and obtain the shear wave velocity by measuring the flexural wave velocity.
[0032] Dipole sonic logging uses a dipole transmitting transducer to excite the bending wave mode in the well site. figure 1 The direction in which pressure waves are generated for monopole, dipole and quadrupole sound sources. figure 2 Where a is the wave mode produced by a conventional acoustic logging tool, and b is the bending wave mode produc...
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