Reservoir engineers need a continuous measurement of permeability to optimize well completion and produce the formation effectively. The borehole Stoneley wave has been shown to be sensitive to fluid mobility, the ratio of permeability and viscosity. the phenomenon is well described using the Biot theory, and models to account for the effect of the mudcake have been proposed. Existing techniques use either the Stoneley slowness or its attenuation at low frequency to estimate the fluid mobility with simplified Biot models. However, the results of these techniques usually show unexplained differences from core measured permeabilities, or with well test results. The objective of the methodology presented in this paper is to improve the reliability of the estimation and to take into account important factors that have been neglected.
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