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Research Papers

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

[+] Author and Article Information
Jialin Tian

Key Laboratory of Oil and Gas Equipment
Ministry of Education,
School of Mechanical Engineering,
Southwest Petroleum University,
Chengdu 610500, China
e-mail: tianjialin001@gmail.com

Genyin Li

Key Laboratory of Oil and Gas Equipment
Ministry of Education,
School of Mechanical Engineering,
Southwest Petroleum University,
Chengdu 610500, China
e-mail: 875669285@qq.com

Liming Dai

Industrial Systems Engineering,
University of Regina,
Regina, SK S4S 0A2, Canada

Lin Yang, Hongzhi He, Shuhui Hu

Key Laboratory of Oil and Gas Equipment
Ministry of Education,
School of Mechanical Engineering,
Southwest Petroleum University,
Chengdu 610500, China

1Corresponding authors.

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS. Manuscript received January 22, 2019; final manuscript received April 16, 2019; published online May 13, 2019. Assoc. Editor: Firdaus Udwadia.

J. Comput. Nonlinear Dynam 14(8), 081007 (May 13, 2019) (11 pages) Paper No: CND-19-1026; doi: 10.1115/1.4043564 History: Received January 22, 2019; Revised April 16, 2019

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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References

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Figures

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Fig. 1

Schematic diagram of the torsional vibration tool: (1) turbine system, (2) adapter, (3) disk valve, (4) cover plate, (5) impact hammer, (6) impact seat, and (7) lower joint

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Fig. 2

Torsional vibrations model of the drill string

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Fig. 3

Angular displacement and velocity of each component without torsional vibration tool: (a) angular displacement results and (b) angular velocity results

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Fig. 4

Angular displacement and velocity of each component with torsional vibration tool: (a) angular displacement results and (b) angular velocity results

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Fig. 5

Angular velocity of the drill bit at different rotational speeds of the top drive

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Fig. 6

Angular velocity of the drill bit at different viscous damping of the drill bit

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Fig. 7

Angular velocity of the drill bit at different WOBs

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Fig. 8

Schematic diagram of BHA

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Fig. 10

Angular velocity of the drill bit in the field test

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