Abstract
Drilling fluid continuous wave (DFCW) technology is an advanced downhole information telemetry technology and has broad application prospects, and its generation, transmission and reception technology has been studied extensively. However, the research on the waveform characteristics of downhole DFCW is still insufficient. In this paper, the characteristic model for describing sinusoidal DFCW in deep wellbore is established by combining the Navier-Stokes equations, orifice throttling theory and Fourier transform method, and the effects of the frequency, wave speed, reflective distance and well depth on the waveform characteristics of DFCW are analyzed based on the proposed model. The research results show that: (1) well depth will influence the amplitude of the DFCW in low frequencies because of the slight compressibility of drilling fluid, (3) smaller reflection distance and larger wave velocity will lead to longer periods of the amplitude-frequencies curves of the DFCW because of the superposition of the pressure wave, (4) the peak value of DFCW is proportional to the wave velocity, but the reflection distance has little effect on the peak or trough of the DFCW amplitude, (5) the DFCW amplitude varies periodically with frequency. The research results can provide critical technical support for the development of downhole DFCW generator and the study of its working characteristics.
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