Research and Application of Vibration Measurement While Drilling in the Undersea Coal Mine

Cao, X.; Li, X.; Yue, F., and Sun, H., 2020. Research and application of vibration measurement while drilling in the undersea coal mine. In: Yang, Y.; Mi, C.; Zhao, L., and Lam, S. (eds.), Global Topics and New Trends in Coastal Research: Port, Coastal and Ocean Engineering. Journal of Coastal Research, Special Issue No. 103, pp. 323–327. Coconut Creek (Florida), ISSN 0749-0208.In order to solve the problem of fine detection of complex geological structure in the mining process of undersea coal mine, the method of vibration measurement while drilling is put forward to realize the automatic and effective identification of lithology. In order to determine the feasibility of the method of vibration measurement while drilling on different engineering conditions, the time domain and frequency domain signals under different drilling conditions were analyzed. The various working conditions, such as static drill pipe, artificial drill pipe, rotated unbroken rock and rotated broken rock, were determined by the time domain signals collected from undersea coal mine. Combined with variance analysis, time-consuming analysis and high frequency signal in frequency domain in rock breaking time, the changes in frequency domain signals of different lithology during drilling and rock breaking are determined, thus determining the position of lithological changes during the drilling process. The method of vibration measurement while drilling provides technical guarantee for fine geological detection.