The response of electromagnetic propagation measurement-while-drilling tools employing tilted coils in cylindrically stratified media was simulated based on an analytical formulation,and the formulation was solved via recursive matrix algorithm.The effects of the metal drill collar,the coil's tilting angle and borehole were analyzed using the provided formulation,and the feature of the coil's radial investigation was also analyzed.The computed results show that the effect on phase difference and amplitude r...