Study on Shear Velocity Profile Inversion Using an Improved High Frequency Constrained Algorithm

The formation shear-wave (S-wave)’s velocity information around a borehole is of great importance in evaluating stability, reflecting fluid invasion, and selecting perforation positions. Dipole acoustic logging an effective method for determining S-wave’s radial profile the borehole. Currently, radial-profile inversion methods are mainly based on impacts changes formations outside dispersion characteristics dipole waveforms, without considering tool curves methods. Accordingly, accuracy greatly impacted practical data-processing applications. In this paper, novel algorithm, which introduces equivalent-tool theory into shear-velocity constrained-inversion method, proposed to obtain slowness profile. Based theory, can be modeled using two parameters, radius elastic modulus. tool’s impact waveform’s eliminated first by theory. Then, corrected curve used carry out constrained processing. results processing simulation data real show validity algorithm.