Spindle vibration characteristics of a point-the-bit rotary steering tool based on the transfer-matrix method

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (16) : 129-135.

ZHANG Hong，CAI Xiaolong，FENG Ding，WANG Peng，TANG Bo

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Abstract

When point-the-bit rotary steering tools are used in well trajectory control, the dynamic characteristics of the spindle will directly affect the control effect and operation safety. In drilling conditions, the position of the tool weight transfer mechanism on the spindle plays an important role in the dynamic characteristics of the spindle. Therefore, in order to analyze the influence of the position of the weight on bit transfer mechanism on the dynamic characteristics of the spindle, a dynamic model of the housing-bearing-spindle system of the point-the-bit rotary steering tool is established by using the multi-body system transfer-matrix method. By deducing the geometric and mechanical equations of any node on the spindle, this study can evaluate the influence of the position of the weight on bit transfer mechanism on the dynamic performance of the spindle. The influence of the installation position of the weight on bit transfer mechanism on the natural frequency and vibration mode of the spindle is analyzed with an example. The influence of the installation position of the weight on bit transfer mechanism on the dynamic displacement of the spindle is discussed. The results show that the natural frequency and dynamic displacement of the spindle increase as the mounting position of the weight on bit transfer mechanism is farther away from the bit. Therefore, it is recommended that the mounting position of the weight on bit transfer mechanism be as close to the bit end as possible to meet the working requirements. In order to verify the correctness of the dynamics model of the spindle established based on the transfer matrix method and the influence law of the installation position of the drilling pressure transfer device on the dynamic displacement of the spindle, the offset test experiment of the spindle measuring point under drilling conditions was carried out on the pointing rotary steering tool test bench. The results show that the data measured by the experiment is basically consistent with the data calculated by the theory, and the maximum error is only 6.47%.

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Point-the-bit rotary steering tool / Transfer-matrix method / spindle / Vibration characteristics

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ZHANG Hong, CAI Xiaolong, FENG Ding, WANG Peng, TANG Bo. Spindle vibration characteristics of a point-the-bit rotary steering tool based on the transfer-matrix method[J]. Journal of Vibration and Shock, 2024, 43(16): 129-135

References

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