Analysis of a Drill-String Experimental Set-Up with Dry Friction-Induced Torsional Vibration

Excessive stick–slip vibration of drill strings can cause inefficiency and unsafety of drilling operations. To suppress the stick–slip vibration that occurred during the downhole drilling process, a drill string torsional vibration system considering the torsional vibration tool has been proposed on the basis of the 4-degree of freedom lumped-parameter model. In the design of the model, the tool is approximated by a simple torsional pendulum that brings impact torque to the drill bit. Furthermore, two sliding mode controllers, U1 and U2, are used to suppress stick–slip vibrations while enabling the drill bit to track the desired angular velocity. Aiming at parameter uncertainty and system instability in the drilling operations, a parameter adaptation law is added to the sliding mode controller U2. Finally, the suppression effects of stick–slip and robustness of parametric uncertainty about the two proposed controllers are demonstrated and compared by simulation and field test results. This paper provides a reference for the suppression of stick–slip vibration and the further study of the complex dynamics of the drill string.

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Torsional vibration in an elastic rod with external dry friction

Journal of Applied Mathematics and Mechanics ◽

10.1016/0021-8928(94)90021-3 ◽

1994 ◽

Vol 58 (5) ◽

pp. 941-944

Author(s):

A.V. Koibin

Keyword(s):

Torsional Vibration ◽

Dry Friction ◽

Elastic Rod

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Clearance and Dry Friction Study in a Nonlinear Torsional Vibration of a Rotating Machinery

Volume 7A: 17th Biennial Conference on Mechanical Vibration and Noise ◽

10.1115/detc99/vib-8297 ◽

1999 ◽

Author(s):

Kazuki Mizutani ◽

Hossain Md. Zahid

Keyword(s):

Torsional Vibration ◽

Dry Friction ◽

Friction Torque ◽

Frictional Property ◽

Behavioral Characteristics ◽

Spring Stiffness ◽

Response Curves ◽

Friction Models ◽

The Difference ◽

Friction Study

Abstract Clearance problem in coupling is often experienced in a rotary torsional vibration system. We tried to analyze the qualitative and quantitative characteristics of torsional vibration by modeling the bilinear spring stiffness with changing friction torque. Symmetric and asymmetric spring stiffness with friction models are developed to investigate the behavioral characteristics of the system for simulations and experiments. The frequency response curves and time response curves with external sinusoidal excitation are observed by several non-dimensional numerical simulations. The thoroughly experiments are done to understand the actual phenomena of torsional vibration, verification of models and adjustability of simulations. The frictional property considered as dry friction in coupling is found very significant parameter to reduce the vibration within a tolerable range in both of the simulations and experiments. The difference between the results getting from simulations and experiments are also demonstrated in this paper elaborately.

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Investigation on the Effect of High-Frequency Torsional Impacts on the Torsional Vibration of an Oilwell Drill String in Slip Phase

Data Mining in Structural Dynamic Analysis ◽

10.1007/978-981-15-0501-0_6 ◽

2019 ◽

pp. 101-121

Author(s):

Liping Tang ◽

Xiaohua Zhu ◽

Yunlai Zhou

Keyword(s):

Torsional Vibration ◽

High Frequency ◽

Drill String

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On “Lump mass torsional vibration model” and helical deformation of drill string

Petroleum ◽

10.1016/j.petlm.2019.11.007 ◽

2019 ◽

Author(s):

Zifeng Li

Keyword(s):

Torsional Vibration ◽

Drill String ◽

Vibration Model

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The Study on Harmonic Vibration of Drill String in Horizontal Well

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.139-141.2397 ◽

2010 ◽

Vol 139-141 ◽

pp. 2397-2400

Author(s):

Chun Jie Han ◽

Tie Yan

Keyword(s):

Horizontal Well ◽

Drill String ◽

Harmonic Vibration ◽

Well Drilling ◽

Harmonic Vibrations ◽

String Vibrations ◽

Resonance Frequencies ◽

Set Up ◽

Drill Tool ◽

Modal Vibration

During exploitation of horizontal well drilling engineering, the problem of drill string failure is very serious, there are many reasons, and drill string vibrations are main reasons. In this paper drill string of horizontal well is object being studied. The models about various vibrations are set up. The vibration rule of drill string is obtained under different situation; the axial and lateral frequency of drill string vibration in free state is studied. The analysis of modal vibration of drill string is the basis of the analysis of harmonic vibration of drill string. The harmonic vibrations rules of drill string of horizontal well are studied. All sorts of resonance frequencies are obtained practicability. This study can prove basic method for optimizing drill tool of horizontal well and reducing drill string failure.

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Torsional Vibrations and Nonlinear Dynamic Characteristics of Drill Strings and Stick-Slip Reduction Mechanism

Journal of Computational and Nonlinear Dynamics ◽

10.1115/1.4043564 ◽

2019 ◽

Vol 14 (8) ◽

Cited By ~ 5

Author(s):

Jialin Tian ◽

Genyin Li ◽

Liming Dai ◽

Lin Yang ◽

Hongzhi He ◽

...

Keyword(s):

Torsional Vibration ◽

Nonlinear Dynamic ◽

Drill String ◽

Drilling Process ◽

Drill Bit ◽

Torsional Vibrations ◽

Reduction Mechanism ◽

Nonlinear Dynamic Model ◽

Stick Slip ◽

Research Results

Torsional stick–slip vibrations easily occur when the drill bit encounters a hard or a hard-soft staggered formation during drilling process. Moreover, serious stick–slip vibrations of the drill string is the main factor leading to low drilling efficiency or even causing the downhole tools failure. Therefore, establishing the stick–slip theoretical model, which is more consistent with the actual field conditions, is the key point for new drilling technology. Based on this, a new torsional vibration tool is proposed in this paper, then the multidegree-of-freedom torsional vibrations model and nonlinear dynamic model of the drill string are established. Combined with the actual working conditions in the drilling process, the stick–slip reduction mechanism of the drill string is studied. The research results show that the higher rotational speed of the top drive, smaller viscous damping of the drill bit, and smaller WOB (weight on bit) will prevent the stick–slip vibration to happen. Moreover, the new torsional vibration tool has excellent stick–slip reduction effect. The research results and the model established in this paper can provide important references for reducing the stick–slip vibrations of the drill string and improving the rock-breaking efficiency.

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