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- W2023756780 abstract "ABSTRACT Full waveform acoustic logs can be used to study the attenuation of body (compressional and shear) and surface (Pseudo-Rayleigh and Stoneley) waves in rock formations around the wellbore. Neglecting fractures, and for a given geometry, it is widely accepted that body waves are attenuated mainly because of viscous flow in the pores. At the same time, Stoneley wave attenuation seems to be related to flow of mud-derived fluids in and out of the rock frame during wave passage. Apart from the factors previously mentioned, there is a strong dependence of wave attenuation with lithology, especially clay content. This is shown here by simple calculations of wave energy in field logs. Clay volume, therefore, must be taken into account if wavetrains are to be used in the identification of highly permeable strata. To detect zones with significant hidraulic conductivity (rocks with high permeability, in relative terms, saturated with low-viscositv fluids), a simple index is proposed. The index I measures the amount of low frequency energy 'corrected' by clay volume using the traditional GR log. The correlation between I and oil production, in recently-drilled wells in northeastern Venezuela, is strong, even when traditional log analysis shows no differences between the perforated pay zones. The simple type of calculations proposed here are suitable for the quick look kind of presentations used during perforation design. They are, however, of local significance and its relation to true permeability is obscure due to variability in fluid type and saturation. Other methods, more meaningful although time consuming, are in study." @default.
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- W2023756780 date "1990-10-14" @default.
- W2023756780 modified "2023-10-05" @default.
- W2023756780 title "Wave Attenuation in Acoustic Logs and Formation Permeability: Case Studies and Experiences" @default.
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- W2023756780 doi "https://doi.org/10.2118/21098-ms" @default.
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