Dynamics modeling and analysis of a down-hole drill string multibody system based on the absolute coordinate formulation

• Published in: Journal of physics. Conference series 2024-11, Vol.2901 (1), p.012041
• Main Authors: Fang, Chao, Li, HaiQuan, Liu, Wei, Xu, ZhaoHui, Liao, MaoLin, Fan, JinChao, Lin, ZiLi, Pang, HaiBo
• Format: Article
• Language: English
• Subjects: Beams (structural); Drilling; Drillstrings; Dynamic characteristics; Dynamic models; Dynamic structural analysis; Dynamical systems; Multibody systems; Nonlinear dynamics; System dynamics; Trajectory control
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/2901/1/012041

Drilling system dynamics is the basis of studying the interaction between components in drilling process, which needs to solve many difficult problems such as geometric nonlinear dynamics of drill string, contact between drill string and wellbore, solving timeliness and so on. The existing research on establishing dynamic unit of local drilling tool structure has low solution efficiency, and it is difficult to meet the requirements of directional trajectory control and drilling speed increase analysis efficiently. Dynamics model of a downhole drill string system is established by using the multibody system dynamics method in this study. The natural coordinate formulation and the absolute nodal coordinate formulation are adopted to describe the rigid parts and the flexible beams, respectively. The presented model can be used to analyze the dynamic characteristics of the drill string system and the interaction between the drill string and the environment such as the wellbore and rocks in the drilling process. Finally, through comparative analysis with on-site test data, the correctness of the multibody dynamic model of the drill string system established in this paper was preliminarily verified.