Mechanical characteristics of flexible shaft in flexible motor load transfer

GUO Qiang; ZHANG Delong; YANG Peng; WENG Wei; WU Shuo; JIN Bo

doi:10.12143/j.ztgc.2025.01.011

2025 Vol. 52, No. 1

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Article navigation > DRILLING ENGINEERING > 2025 > 52(1): 78-83

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GUO Qiang, ZHANG Delong, YANG Peng, WENG Wei, WU Shuo, JIN Bo. 2025. Mechanical characteristics of flexible shaft in flexible motor load transfer. DRILLING ENGINEERING, 52(1): 78-83. doi: 10.12143/j.ztgc.2025.01.011

Citation:

GUO Qiang, ZHANG Delong, YANG Peng, WENG Wei, WU Shuo, JIN Bo. 2025. Mechanical characteristics of flexible shaft in flexible motor load transfer. DRILLING ENGINEERING, 52(1): 78-83. doi: 10.12143/j.ztgc.2025.01.011

Mechanical characteristics of flexible shaft in flexible motor load transfer

1. Technology Innovation Center for Directional Drilling Engineering, Ministry of Natural Resources, Langfang Hebei 065000, China;
2. Innovation Base for Directional Drilling Engineering, Geological Society of China, Langfang Hebei 065000, China;
3. Beijing Institute of Exploration Engineering, Beijing 100083, China;
4. China University of Geosciences (Beijing ), Beijing 100083, China

More Information

Corresponding author: YANG Peng

Received Date: 10 April 2024

Revised Date: 25 July 2024

Abstract

Abstract

Flexure shaft is a key component for torque transfer between the joints of ultra-short radius flexible motor units. Aiming at the failure phenomena such as fracture of flexure shaft in the drilling process of ultra-short radius flexible motor, this paper carries out mechanical modelling and design strength checking of the internal flexure shaft of the flexible motor, uses finite element simulation to carry out stress analysis on the stress state of the flexure shaft in the torque transmission process of the flexible motor, and tests the mechanical properties of the flexible motor through indoor teststo analyse the mechanical properties of flexure shafts. The results show that the root and spline contact surfaces of the flexure shaft are the stress concentration areas in torque transmission, and the fatigue life of the flexure shaft can meet the requirements of continuous downhole operation. The finite element analysis and indoor tests show that the flexure shaft can transmit torque of 500N·m, which can realise the internal torque load transmission of the flexible motor under alternating bending and torsional stresses. This provides an important theoretical basis for the drilling process of ultra-short radius flexible motors in the development of horizontal wells, and provides a new type of technical means to improve the drilling length and drilling efficiency of the horizontal section of ultra-short radius horizontal wells.
- ultra-short radius /
- flexible motor /
- flexible shaft /
- mechanical properties /
- finite element analysis /
- torque transfer

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References

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