Influence of flex-sub on mechanical properties of rotary steerable drilling system

Wang, Jin; Xue, Qilong; Li, Lixin; Huang, Leilei; Li, Fangtao; Liu, Baolin

doi:10.5194/ms-11-285-2020

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…This study provided a theoretical understanding of the drill string nonlinear motion in non-vertical wells. Wang Jin et al [26] analyzed the dynamics model of a rotary steerable system (RSS) with a single stabilizer and flexible joint, and simplified the drill collar and joint to obtain a suitable BHA mechanical analysis model and a finite element analysis model. However, these studies do not take into account the interaction between the drill string and the casing.…”

Section: Introductionmentioning

confidence: 99%

A Nonlinear Dynamic Model for Characterizing the Downhole Motions of the Sidetracking Tool in a Multilateral Well

et al. 2023

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It is of practical interest to investigate the mechanical behaviors of a sidetracking tool system and to describe the sidetracking tool’s vibration mechanical response, as this can provide an important basis for evaluating and optimizing the tool structure and effectively controlling the profile of the sidetracking window. In this article, three nonlinear dynamic models with ten, six, and two degrees of freedom, respectively, are established using the Lagrange method to characterize the behavior of the sidetracking tool. It should be noted that in these models, the axial, lateral, and torsional vibration of the tool system are fully coupled. The process of the sidetracking tool mills in the casing-pipe wall is divide into three typical stages, i.e., the window mill, pilot mill, and watermelon mill grinding the casing, respectively. The dynamic response of the three stages is studied to more effectively analyze the influence of the sidetracking tool vibration deformation on the window width. The Runge–Kutta method, which is easy to implement, is applied to solve the supposed nonlinear dynamic model, and some useful findings are as follows. The effects of sidetracking tool vibrations at different stages on window widening size are illustrated quantitatively. The vibration trajectory pattern of the sidetracking tool is different from that of the conventional drilling tool due to the influence of the whipstock, which changes from the general whirling motion pattern to the X reciprocating pattern, and the vibration amplitude decreases. Due to the influence of the tool’s lateral amplitude, the window profile is widened. The widened window size of the window mill and the pilot mill are 3.30 mm and 2.74 mm, respectively, and the extended window size of the watermelon mill is 0.07 mm, while the maximum window width formed by the sidetracking tool is 374.34 mm. This work proposes, for the first time, the coupled vibration model of the sidetracking tool system, which is helpful to better understand the nonlinear dynamic effects of the sidetracking tool, laying the foundation for the optimization of the sidetracking parameters.

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Section: Introductionmentioning

confidence: 99%

A Nonlinear Dynamic Model for Characterizing the Downhole Motions of the Sidetracking Tool in a Multilateral Well

et al. 2023

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“…VA Dunayevsky et al 14 pro- posed the basic theory of the development of drill string dynamics simulator for the drill string control problem. Jinwang et al 15 established the dynamic model with single stabilizer and flexible RSS to analyze the dynamic stress about steering drill tools. Lin Yang et al 16 carried out drill string dynamics study based on multidimensional impactor, but this tool cannot produce a sustained force.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Characteristics of New Mechanical Rotary Steerable Tool in Directional Drilling

Tian¹,

Tang²,

Xue-hua³

et al. 2022

The International Journal of Acoustics and Vibration

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The characteristics of a drill string system have an essential influence on the performance of directional drilling. The appropriate control method of a drill string is important to drilling efficiency and downhole operation safety. Therefore, based on a new mechanical rotary steerable tool (RST), this paper aims to analyze the Dynamic Characteristics of RST in Directional Drilling. First, considering the thrust force generated by the RST and bottom hole assembly (BHA), the governing vibration equations of a drill string system are established. Furthermore, connected with fields drilling parameters, including the effects of a new RST on a drill bit and wellbore, as the boundary and initial conditions, the dynamic characteristics of a drill string system are compared and studied in directional and straight drilling. The results show that the axial vibration of the drill string increases extremely in directional drilling process, while the weight on bit (WOB) and inclination force change in small range. Moreover, the torque and azimuth force tend to be stable soon, even its initial fluctuations are significantly. Also, the new RST can effectively enhance the steering capacity, increase the drilling efficiency, and improve drill bit force performance. The research results can provide reference for developing directional drilling technologies, including related tool design and optimization.

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Dynamics and fatigue life investigation of push-the-bit rotary steerable bottom hole assembly with whirling finite element model

Sun

et al. 2023

Engineering Failure Analysis

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Influence of flex-sub on mechanical properties of rotary steerable drilling system

Cited by 5 publications

References 27 publications

A Nonlinear Dynamic Model for Characterizing the Downhole Motions of the Sidetracking Tool in a Multilateral Well

A Nonlinear Dynamic Model for Characterizing the Downhole Motions of the Sidetracking Tool in a Multilateral Well

Dynamic Characteristics of New Mechanical Rotary Steerable Tool in Directional Drilling

Dynamics and fatigue life investigation of push-the-bit rotary steerable bottom hole assembly with whirling finite element model

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