Experimental Study on Drilling Signal Characteristics of PDC Drill Bit in Media of Different Strengths and Identification of Weak Media.

Additionally, the mean vibration velocity in the Z direction shows a decreasing trend as the strength of the drilled medium increases. 4.1.2.

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The mean values of both the thrust and torque exhibit an increasing trend as the strength of the drilled medium increases.

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The thrust signal for when the drill bit reached the interface between the specimens shows a clear trend of first decreasing and then increasing, exhibiting a similar “V-shaped” pattern, and the vibration velocity in the z-direction also follows this trend.

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