Abstract
Multipole borehole acoustic source output and frequency content is strongly influenced by borehole fluid, tool and formation loading effects. An extra complication comes from the fact that multipole sources act in tandem and therefore the action on one source influences the loading on another and vice versa (Mutually induced impedance loading). In this paper we calculate the fluid loading forces on the constituent finite aperture (volume type) multipole sources and how they affect the effective multipole source signature in terms of resonance frequency and attenuation. A Numerical example will be presented where the individual multipole source constituents are driven by the well-known Tonpilz (Segmented piezoelectric bar) actuator. Results will be shown for the monopole, dipole and quadrupole excitation.
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