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Analytical and experimental research on the cutting mechanical properties of an electromagnetically coupled downhole cutting tool.

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Title: Analytical and experimental research on the cutting mechanical properties of an electromagnetically coupled downhole cutting tool.
Authors: Liu, Yongsheng1 (AUTHOR) yongsheng@cugb.edu.cn, Chu, Tianshu1 (AUTHOR) 2102230060@email.cugb.edu.cn, Huang, Xu1 (AUTHOR) 2102210015@email.cugb.edu.cn, Yang, Shangyu2 (AUTHOR) yangshangyu@cnpc.com.cn, Sun, Qiang3 (AUTHOR) sun_yuppy@petrochina.com.cn
Source: Measurement (02632241). Sep2025:Part A, Vol. 253, pN.PAG-N.PAG. 1p.
Subjects: Electromagnetic coupling, Cutting force, Magnetic particles, Magnetic torque, Cutting tools
Abstract: • The cutting control equation of the electromagnetic coupled downhole cutting tool is established. • The changing characteristics of cutting force, braking torque and excitation current in the feeding direction are analyzed. • Innovative experiments on the cutting characteristics of electromagnetic coupled downhole cutting tool were carried out. Downhole tubular cutting technology plays a pivotal role in well repair, tubular replacement, and specialized completion processes, and it has attracted considerable attention in the drilling engineering field. In this study, an electromagnetically coupled downhole cutting tool (ECDCT) was developed by using a magnetic conductive component to cooperate with the structure and complete cutting and feeding coordination. This prototype effectively overcame the problems resulting from excessive motor numbers and high motor power requirements through the application of pure electric tools. Regarding the feeding of the ECDCT, the relationship between the braking torque of the magnetic powder brake and the excitation current was identified by analyzing its working principle. Besides, the cutting procedure was completed during the driving of the rack and pinion by utilizing the rack as the tool. Additionally, the tool feed was predicted and controlled by employing the relationship between excitation current changes and cutting force as the system transmission medium. Moreover, the output characteristics of braking torque, excitation current, and cutting force were calculated and simulated at different speeds. The results demonstrated that the difference in the feed cutting force and braking torque was about 5 % and 7 %, respectively, for every 5 rpm speed difference. In addition, an experimental platform of the ECDCT was established, and the experiments were conducted at 60 rpm. Through a comparison with the cutting control equation, the effectiveness of this control model was verified, with the calculation results in good agreement with the experimental data. Overall, the cutting control model is applicable to the feed speed prediction of the ECDCT, with the accuracy reaching up to 80 %. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:• The cutting control equation of the electromagnetic coupled downhole cutting tool is established. • The changing characteristics of cutting force, braking torque and excitation current in the feeding direction are analyzed. • Innovative experiments on the cutting characteristics of electromagnetic coupled downhole cutting tool were carried out. Downhole tubular cutting technology plays a pivotal role in well repair, tubular replacement, and specialized completion processes, and it has attracted considerable attention in the drilling engineering field. In this study, an electromagnetically coupled downhole cutting tool (ECDCT) was developed by using a magnetic conductive component to cooperate with the structure and complete cutting and feeding coordination. This prototype effectively overcame the problems resulting from excessive motor numbers and high motor power requirements through the application of pure electric tools. Regarding the feeding of the ECDCT, the relationship between the braking torque of the magnetic powder brake and the excitation current was identified by analyzing its working principle. Besides, the cutting procedure was completed during the driving of the rack and pinion by utilizing the rack as the tool. Additionally, the tool feed was predicted and controlled by employing the relationship between excitation current changes and cutting force as the system transmission medium. Moreover, the output characteristics of braking torque, excitation current, and cutting force were calculated and simulated at different speeds. The results demonstrated that the difference in the feed cutting force and braking torque was about 5 % and 7 %, respectively, for every 5 rpm speed difference. In addition, an experimental platform of the ECDCT was established, and the experiments were conducted at 60 rpm. Through a comparison with the cutting control equation, the effectiveness of this control model was verified, with the calculation results in good agreement with the experimental data. Overall, the cutting control model is applicable to the feed speed prediction of the ECDCT, with the accuracy reaching up to 80 %. [ABSTRACT FROM AUTHOR]
ISSN:02632241
DOI:10.1016/j.measurement.2025.117453