Patent ID: 7660196
Filing Date: 2010-02-09
Classification: G01V

Abstract:
1. A method of processing flexural wave acoustic data from a tool in a borehole traversing a formation, comprising: using the tool to transmit and receive the flexural wave acoustic data in the borehole; generating a set of estimated slowness curves from the flexural wave acoustic data; determining an upper limit for a frequency filter band; determining a lower frequency limit for the frequency filter band; compensating for effect of a tool comprising defining a modified borehole diameter by determining the residual difference R between two dispersion curves as wherein S is formation shear slowness; S s is sensitivity to the formation shear slowness, S tool is a dispersion curve with a tool present; S empty is a dispersion curve without the presence of a tool, d is borehole diameter; f is frequency; and a is a constant.