Wave simulations for cementing quality sonic logging using a finite difference method

Cementing quality evaluation is significant in oil production. We use high order staggered grid finite difference method to simulate borehole acoustic field of different cement cases. First, results from the finite difference method and real axis integration for the open-hole case with fast formation are compared. Then, using the plane wave pulse source, the received waveforms of cases with different media outside the casing are calculated. Numerical results show that the various modes of wave amplitudes are very different when the media is different. Our numerical results show that, as acoustic impedance of cements decreases, the amplitude of S0 Lamb mode increases, whereas amplitude of A0 Lamb mode decreases.