Research on Dynamic Characteristics of Drill String Rotation Orientation Tool

To address the issue of low drilling efficiency in horizontal wells, a Drilling String Rotary Orientation Tool (DROT) has been proposed, and its dynamic characteristics have been comprehensively examined. The dynamic model of drill string system has been established, and the axial dynamic response characteristics of the drill string system both with and without DROT are analyzed. The findings indicate that when the axial displacement of each drill string unit stabilizes following the use of tools, both the upper and lower limits of axial displacement increase, while the width of the fluctuation interval decreases. Further analysis of the impact of weight on bit and rotary torque within the system indicates that variations in rotary torque exert a more pronounced influence on the drill string system. Additionally, it is observed that the fluctuation range of axial displacement diminishes as rotary torque increases. Finally, after analyzing the lower limit of axial displacement and the rate of wear degree reduction, it is observed that the drilling string system equipped with the tool exhibits a positive displacement increase ratio. Furthermore, the wear degree reduction rate consistently remains above 0.6. This indicates that the introduction of the tool significantly enhances its effectiveness in reducing friction and resistance.