There is less research on the safety performance of rotary steering drilling tool based on dynamic characteristics.Considering the structure of drill string,drilling parameters,and the contact between drill string and borehole wall and other parameters comprehensively,a dynamic model of the whole well drill string system was built based on the Lagrange equation.Then,the model was discretized using the finite element method and solved using Newmark-β.Finally,based on the structure and properties of the rotary steering drilling tool,the dynamic characteristics and safety performance of the rotary steering bottomhole assembly under the influential factors such as installation position of stabilizer,flexible joint size and WOB were studied.The study results show that installing a centralizer can significantly reduce the lateral vibration of the rotary steering bottomhole assembly.The length of the flexible joint has a significant impact on the safety performance of the rotary steering bottomhole assembly.A rea-sonable length can significantly reduce lateral vibration;otherwise,it will have an opposite effect.Increasing WOB would increase the lateral displacement of the bottomhole assembly,so it is not recommended in engineering to use high WOB to increase drilling speed when using rotary steering tools.The study conclusions provide theoreti-cal support for the research and application of rotary steering tools.
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