In this paper, a new test system for simulating the axial-torsional coupling vibration of drill string is proposed. Based on this system, a single-factor experiment was designed, and the influence of driving speed, feed speed, drill bit diameter, rock sample strength and drill string stiffness on drill string vibration was studied, and the influence of the above factors on drill string vibration was explored through orthogonal experiments. The single-factor experimental results show that with the increase of rotational speed, the axial vibration amplitude first decreases and then increases, but the torsional vibration amplitude gradually decreases. With the increase of feed speed, the amplitude of axial vibration gradually decreases, but the amplitude of torsional vibration gradually increases. The increase in speed leads to a decrease in torque and drilling pressure, while an increase in feed speed leads to an increase in torque and drilling pressure; The use of small diameter drill bits, low strength rock samples, and low stiffness drill string all help to reduce the axial vibration amplitude of the drill string, but all lead to an increase in the torsional vibration amplitude. The orthogonal experimental results show that the speed has the greatest influence on the axial vibration, and the feed speed has the greatest influence on the torsional vibration. The experimental results are basically consistent with the prediction results of the numerical simulation of the axial-torsional coupling model of two-degree-of-freedom drill string.
Key words
drill strings /
coupled axial-torsional vibration /
single-parameter experiment /
orthogonal experiment
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References
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