Manufacturing Technology 2025, 25(5):645-654 | DOI: 10.21062/mft.2025.061

Push-Type Rotary Steering Mandrel Mechanical Analysis and Life Prediction

Wenzhe Li ORCID...1, Ye Chen ORCID...1, Jichuan Zhang ORCID...2,3, Xudong Wang ORCID...1, Pengcheng Wu ORCID...1, Chengyu Ma ORCID...4, Xiumei Wan ORCID...1, Xing Chen ORCID...2,3
1 Engineering Technology Research Institute, PetroChina Southwest Oil &Gasfield Company, Chengdu, Sichuan, 610017, China
2 CNPC Chuanqing Drilling Engineering Company limited, Chengdu, Sichuan, 610055, China
3 Top of Energy technology Company, Chengdu, Sichuan, 610032, China
4 PetroChina Southwest Oil &Gasfield Company, Chengdu, Sichuan, 610055, China

The push-type rotary steerable core bearing has high load capacity and high precision, and has been widely used in oil and gas drilling field. Its service life is difficult to predict due to various complex working conditions. Based on the finite element method, this paper establishes a three-dimensional rotating guide mandrel model to calculate and analyze the mechanical simulation of the guide mandrel under different working conditions, and establishes the corresponding life prediction model to predict its life. The results show that reducing the torque and speed in the range of drilling requirements is conducive to improving the overall life of the spindle, and the life matrix and life distribution are consistent with the characteristics of S-N curve, which is consistent with the characteristics of high cyclic stress of the spindle. The research results can be used to reliably predict the life of the push-type rotary steering mandrel and simulate its working state with high precision. This data is critical for reliability analysis and design optimization.

Keywords: Rotary steerable system, Finite element method, Life prediction, S-N fatigue

Received: March 21, 2025; Revised: September 9, 2025; Accepted: October 20, 2025; Prepublished online: November 20, 2025; Published: December 8, 2025  Show citation

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Li W, Chen Y, Zhang J, Wang X, Wu P, Ma C, et al.. Push-Type Rotary Steering Mandrel Mechanical Analysis and Life Prediction. Manufacturing Technology. 2025;25(5):645-654. doi: 10.21062/mft.2025.061.
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