Abstract
With the growth of oil and gas resource demand, the hydro-oscillator is widely used to enhance the Rate of penetration (ROP) and improve the efficacy in drilling various wells. The vibration model is the key issue of dynamics analysis and optimization of downhole tools. For the vibration analysis of the new drill string system with hydro-oscillator in the horizontal well, based on the design of the new hydro- oscillator and its operation conditions, the kinematics expressions are presented. Combined with the vibration force calculation results of the hydro-oscillator, the dynamics model of the new drill string system is established. Furthermore, the important features of vibration frequency, displacement, velocity and acceleration are discussed in the numerical example calculation results. By comparing the results of the calculation and experiment test, we can verify the correctness of the analysis model. With the hydro-oscillator vibration effect, the static friction between the drill string and wellbore is changed to the dynamic friction, so it can result in a significant increase in run length. At the same time, the ROP can be enhanced with the vibration effect. Moreover, with the parameters’ adjustment according to the operation conditions, the analysis method and model can also provide references to the study of similar downhole tools dynamics or mechanical properties.
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Recommended by Associate Editor Eung-Soo Shin
Jialin Tian is currently an associate professor at School of Mechanical Engineering, Southwest Petroleum University. His research interests include the mechanical dynamics, drill bit technology, downhole tools, and drilling dynamics.
Zhi Yang is currently a graduate student at School of Mechanical Engineering, Southwest Petroleum University. His research interests include downhole tools and drilling dynamics.
Lin Yang received her Ph.D. in Mechanical Engineering from Southwest Petroleum University in 2013. She continued her postdoctoral research at the School of Petroleum Engineering, Southwest Petroleum University. Her research interests include drilling dynamics and hydromechanics.
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Tian, J., Yang, Z., Li, Y. et al. Vibration analysis of new drill string system with hydro-oscillator in horizontal well. J Mech Sci Technol 30, 2443–2451 (2016). https://doi.org/10.1007/s12206-016-0504-z
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DOI: https://doi.org/10.1007/s12206-016-0504-z