Title: Coupling characteristics of rotary punch drilling systems under impact loads

Authors: Yong Zhu; Chenlin Ding; Bo Lan; Qiang Gao

Addresses: National Research Center of Pumps, Jiangsu University, Zhenjiang, 212013, China; Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, 212013, China ' National Research Center of Pumps, Jiangsu University, Zhenjiang, 212013, China; Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, 212013, China ' National Research Center of Pumps, Jiangsu University, Zhenjiang, 212013, China; Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, 212013, China ' National Research Center of Pumps, Jiangsu University, Zhenjiang, 212013, China; Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, 212013, China

Abstract: This paper addresses nonlinear vibrations and low energy efficiency in deep well drilling in complex geological settings. A novel electromechanical-hydraulic-gas (EHG) coupled rotary punch drilling (RPD) system is investigated. Firstly, dynamic characteristics of key components are modelled, establishing a foundation for system modelling. Subsequently, a multi-physics EHG simulation model for the RPD system is established using AMESim and Simulink for co-simulation, thoroughly validating its accuracy and stability under transient loads. Results show that with increased impact load amplitudes, pressure response times in feed and rotary systems remain below 1.5 s, flow fluctuation under 3%, and drill string velocity stabilises within 2 s. High-frequency impacts produce synchronous pressure and flow adaptations. The pneumatic impact mechanism reaches a peak piston velocity of 62.84 m/s, maintaining effective rock-bit contact. These results further enhance drilling rig impact resistance, energy efficiency, and control of dynamic characteristics.

Keywords: deep well rig; rotary punch drilling system; RPD; coupling modelling; impact loads; dynamic characteristics.

DOI: 10.1504/IJHM.2026.152980

International Journal of Hydromechatronics, 2026 Vol.9 No.1, pp.1 - 27

Received: 03 Jul 2025
Accepted: 17 Aug 2025
Published online: 17 Apr 2026 *

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