Abstract
Stick-slip of the drill string, as one of the critical factors affecting drilling efficiency, has always been a hot topic for experts and scholars in related fields. Serious stick-slip vibration affects the well construction efficiency, drilling cost and even lead to a downhole accident. Therefore, based on the current research, this paper takes a new type of composite vibration tool as the research object, studies the working mechanism of the tool and analyzes the effect of stick-slip reduction. After establishing the multi-degree-of-freedom torsional dynamics model, we obtained the results of torsional vibration dynamics by cases analysis based on working conditions and related mechanical parameters. In addition, the results of the examples, compared with the field experimental data, verify that the vibration shock generated by the new composite tool can effectively reduce the torque fluctuation range of the system, avoid the occurrence of stick-slip phenomenon, improve the ROP (rate of penetration), and make drilling process more stable. This paper can provide reference for the optimization and development of stick-slip technology in drilling engineering, and the theoretical methods can also be developed to study the dynamics of drill string.
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Abbreviations
- ROP:
-
Rate of penetration
- BHA:
-
Bottom hole assembly
- W ob :
-
Input static drilling pressure
- T m :
-
Input torque
- D i :
-
Drill pipe outer diameter
- d i :
-
Drill pipe inner diameter
- I i :
-
Unit drill pipe length
- ρ :
-
Density of drill pipe material
- J i :
-
Moment of inertia of /-th node
- G :
-
Shear modulus of drill string
- ξ ri :
-
Torsional damping coefficient per unit length
- k ci :
-
Torsional stiffness between drill pipe and drill collar
- k cT :
-
Torsional stiffness between drill collar and tool
- k cb :
-
Torsional stiffness between tool and drill bit
- k c(b+1) :
-
Torsional stiffness between drill bit and rock
- c ri :
-
Torsional damping between drill pipe joints
- K ri :
-
Torsional stiffness between drill pipe joints
- c rc :
-
Torsional damping between drill pipe and drill collar
- c rT :
-
Torsional damping between drill collar and tool
- c rb :
-
Torsional damping between drill collar and drill bit
- c r(b+1) :
-
Torsional damping between drill bit and rock
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Acknowledgments
All authors gratefully acknowledge the support of The State Scholarship Fund of the China Scholarship Council (CSC) (No. 201608515039), National Natural Science Foundation of China (NSFC) (No.51674216), National Science and Technology Major Project of China (No.2016ZX05038).
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Recommended by Editor No-cheol Park
Jialin Tian is currently a Professor of the School of Mechanical Engineering in Southwest Petroleum University. His research interests include mechanical nonlinear dynamics and vibration control, modern design theory and methods of oil and gas equipment, downhole tools, electromechanical system monitoring and signal analysis.
Lai Wei is currently a graduate student of the School of Mechanical Engineering in Southwest Petroleum University. His research interests include downhole tools and drilling dynamics.
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Tian, J., Wei, L., Yang, L. et al. Research and experimental analysis of drill string dynamics characteristics and stick-slip reduction mechanism. J Mech Sci Technol 34, 977–986 (2020). https://doi.org/10.1007/s12206-020-0201-9
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DOI: https://doi.org/10.1007/s12206-020-0201-9