JACIII Vol.27 No.2 pp. 314-321
doi: 10.20965/jaciii.2023.p0314

Research Paper:

Drill-String Dynamics Model of Horizontal Coal Mine Wells Considering Intermittent Borehole Wall Contact

Jie Huang*1,*2,*3, Chengda Lu*1,*2,*3,†, Luefeng Chen*1,*2,*3, Quanxin Li*4, Wangnian Li*1,*2,*3,*4, Hongchao Wei*4, and Min Wu*1,*2,*3

*1School of Automation, China University of Geosciences
No.388 Lumo Road, Hongshan District, Wuhan 430074, China

*2Hubei Key Laboratory of Advanced Control and Intelligent Automation for Complex Systems
No.388 Lumo Road, Hongshan District, Wuhan 430074, China

*3Engineering Research Center of Intelligent Technology for Geo-Exploration, Ministry of Education
No.388 Lumo Road, Hongshan District, Wuhan 430074, China

*4Xi’an Research Institute (Group) Co., Ltd., China Coal Technology and Engineering Group
No.82 Jinye 1st Road, Gaoxin District, Xi’an 710077, China

Corresponding author

December 10, 2022
December 29, 2022
March 20, 2023
horizontal well, drill-string dynamics, intermittent borehole wall contact, stick-slip, coal mine

During the drilling process, horizontal drill strings are often subject to stick-slip and back-pressure phenomena, which undermine drilling safety and affect drilling costs. However, most of the models proposed in the existing literature apply only to the analysis of the drill string motion state and are irrelevant to the rotary drilling process in coal mines. This paper presents a lumped-mass model of a drill string in a horizontal coal mine well. First, based on reasonable assumptions, the drill-string system was considered as four lumped-mass units. The lateral-torsional dynamics model was established based on the Lagrange dynamics theory. Further, combined with lateral movement, the intermittent contact between the drill string and borehole wall is described, and the friction torque due to this intermittent contact is calculated. Combined with the Karnopp bit-rock interaction, a drill-string dynamics model of horizontal wells that considers intermittent contact friction was developed. The proposed horizontal well drill-string model is more suitable for rotary drilling in a coal mine, and the nonlinear influencing factors are considered more comprehensive.

Cite this article as:
J. Huang, C. Lu, L. Chen, Q. Li, W. Li, H. Wei, and M. Wu, “Drill-String Dynamics Model of Horizontal Coal Mine Wells Considering Intermittent Borehole Wall Contact,” J. Adv. Comput. Intell. Intell. Inform., Vol.27 No.2, pp. 314-321, 2023.
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