Analysis on the nonlinear lateral vibration of drillstring in curved wells with beam finite element

Cai, Mingjie; Mao, Liangjie; Xing, XueSong; Zhang, Huizeng; Li, Juan

doi:10.1016/j.cnsns.2021.106065

Cited by 13 publications

(3 citation statements)

References 33 publications

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“…where T refers to kinetic energy, V refers to potential energy, U i refers to the velocity of the node, and F i refers to the external force applied to the node. The expression for the total kinetic energy of the beam unit 21,22 is where _ u xo , _ u yo , and _ u zo , refer to translation velocity on X, Y, and Z, respectively, in m/s; u x , u y , and u z refer to the angles of the beam element section around the xaxes, y-axes, and z-axes, respectively, in rad; _ u x , _ u y , and _ u z refer to the angular speed of the beam element section around the x-axes, y-axes, and z-axes, in rad/s; e refers to the eccentric distance of a section, in m; O refers to the actual rotation speed of drill string in the pit, rad/s; r refers to the density of drill string, in kg/m 3 ; l e refers to the length of a beam element, in m; A refers to the cross-sectional area of a beam element, in m 2 ; I x refers to the polar moment of inertia of the cross section of a beam element, in m 4 ; I yz refers to the moment of inertia of the cross section of a beam element, in m 4 . In equation ( 3), the first three terms represent the translational kinetic energy, while the last two terms represent the rotational kinetic energy.…”

Section: Establishment Of Dynamic Modelmentioning

confidence: 99%

Study on dynamic characteristics of drill string in deep-water riserless drilling

Huang

Yang

et al. 2023

Advances in Mechanical Engineering

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The cost and security of ocean drilling are directly related to the efficient exploration and development of ocean resources. The riserless drilling system is usually adopted in the ocean drilling. With the consideration of marine environment load, a dynamic analysis model of drill string in deep-water riserless drilling is established. This model aims to analyze the dynamic characteristics of drill string in the water and down hole during the process of deep-water riserless drilling. The research results are as follows. For the drill string in water, its displacement increase with the increase of ocean current velocity, water depth, rotation speed, and WOB. But the rotation speed and WOB have less influence. The drill string in down hole shows the same pattern. However, the drill string in down hole is only affected near the mud line and the bit, and the rest of the drill string is almost unaffected. In deep-water riserless drilling, stress on the drill string at the wellhead, near the mudline, and at the bottom hole assembly (BHA) is complex. The safety of drill string at these locations should be given great attention.

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Section: Establishment Of Dynamic Modelmentioning

confidence: 99%

Study on dynamic characteristics of drill string in deep-water riserless drilling

Huang

Yang

et al. 2023

Advances in Mechanical Engineering

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“…Li et al 9,10 established a lateral dynamic model of drill string in a highly inclined well by finite element theory, and the effects of rotational speed, WOB, well deviation angle, and friction coefficient on the lateral vibration of drill string are verified. On the basis of previous studies on vertical and curved wells, Cai et al 11 established a dynamic model of BHA in curved boreholes by discrete element method, the numerical results were obtained by solving differential equations with generalized alpha method; The accuracy of theoretical model and numerical simulation was verified by field measurement data, which provided ideas and schemes for the study of drill string dynamics in curved wells. Aiming at the problem of low penetration rate of traditional anti-inclination drill assembly, Fu et al 12 established a dynamic model of BHA with prebent joint by finite element method on the basis of engineering application, and the effects of BHA structural parameters and mechanical parameters of the system on lateral force and BHA motion morphology were discussed, but the results show that the bit motion is unstable.…”

Section: Introductionmentioning

confidence: 99%

Study on lateral vibration characteristics of BHA with double-span drill collar

Tao,

Meng,

Huang

et al. 2024

Advances in Mechanical Engineering

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The severe vibration of BHA directly affect the drilling efficiency, borehole trajectory, and wellbore quality. Therefore, it is crucial for developing dynamic mechanics of drill string system by studying the mechanical behavior of BHA. In this paper, considering the continuity condition of double-span drill collar, the expression of lateral vibration of drill collars is firstly obtained by using the assumption mode method. Then, the lateral vibration equation of double-span drill collar is derived by Lagrange equation. Finally, a self-programming model is established based on dynamic mechanics of drill string system, the lateral vibration characteristics of double-span drill collar in four different types of BHA is further determined by the fourth-order Runge-Kutta algorithm. It is obviously found that the lateral vibration is enhanced with increasing the length of drill collar; the rotation speed of BHA, weight on bit (WOB), and the size of stabilizer have a significant influence on the lateral vibration of drill collar. In the practical application, the lengths of the first-span and the second-span drill collar are given as 10 and 19 m, respectively; and the stabilizer diameter approached to bit diameter is recommend in practical gas drilling engineering; under WOB of 10–40 kN, the rotation speed of the drilling string should be controlled nearby 60 r/min. The theoretical investigation is a guidance for structure design of BHA and optimization of drilling parameter.

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“…Furthermore, variations in drilling parameters, as well as model parameters, significantly influence the trajectory of drillstring motions. Cheng et al employed shell elements while Cai et al utilized finite beam elements to establish drillstring dynamics models; they focused on analyzing how rotational speed, WOB, and friction coefficient affect whirling and motion trajectories [25,26]. Li et al, employing principles such as minimum energy principle along with Buckingham π theorem-based similarity criteria, constructed numerical models as well as laboratory test benches to investigate how rotational speed, WOB, and friction coefficient impact lateral vibrations [27].…”

Section: Introductionmentioning

confidence: 99%

Research on the Influence of Deep-Water Drilling Risers on Drillstring Motion Trajectory and Vibration Characteristics

Hai,

He,

Xue

2024

Machines

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The swing of the riser in deep-water drilling can significantly impact the drill string. In this study, we establish a riser model that considers the combined disturbance of periodic dynamic wind and wave loads. By coupling it with the drill string model, we develop a dynamic model for deep-water drilling systems. Through analyzing multiple sets of different drilling parameters, we examine displacements and impact forces at various positions along the drill string system. Specifically, our focus lies on velocity, acceleration, and rotational speed information of BHA. We investigate how WOB and rotational speed influence motion trajectory and vibration characteristics of the drill string within the dynamic model of deep-water drilling systems. Simulation results reveal slight differences in whirling trajectories between inside the riser and below mud line for the drill string. Rotational speed has a greater impact on the drill string compared to WOB; higher rotational speeds lead to increased collision forces between the drill string system and both riser and wellbore. Our findings identify specific combinations of WOB and rotational speed parameters that can stabilize drilling operations within dynamic models for deep-water drilling systems. These research results provide valuable insights for adjusting WOB and rotational speed parameters in deep-water drilling.

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Analysis on the nonlinear lateral vibration of drillstring in curved wells with beam finite element

Cited by 13 publications

References 33 publications

Study on dynamic characteristics of drill string in deep-water riserless drilling

Study on dynamic characteristics of drill string in deep-water riserless drilling

Study on lateral vibration characteristics of BHA with double-span drill collar

Research on the Influence of Deep-Water Drilling Risers on Drillstring Motion Trajectory and Vibration Characteristics

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