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Mechanism of Stick-Slip Vibration of Drill String Considering Axial and Torsional Oscillations

Jialin Tian

School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500, China

Tianhong Xia

School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500, China

Tangjia Zhang

School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500, China

Yi Yang

School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, 610500, China

25-33

Vol: 7, Issue: 1, 2017

Receiving Date: 2016-10-19 Acceptance Date:

2016-12-24

Publication Date:

2017-01-16

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Abstract

In new oil and gas resources mining, under the complex well structure of Deep well, multi-lateral well, directional well and high angle hole make downhole tools face more severe downhole environment and the stick-slip vibration phenomenon of the drill string is more prominent. According to the existing research results, this paper establishes a longitudinal and torsional drill string model based on the coupling effect of axial and torsional oscillations, which is more consistent with the actual situation. With the boundary conditions determined according to the drilling situation, the stick-slip of drill string results are simulated by MATLAB and Newmark-β Method, the numeral analysis cases related to WOB, RPM, and the axial vibration of drilling string are proposed to prove the validity and feasibility of the model. The research results can provide reference for the new conditions of stick slip mechanism, and the inhibition of stick slip phenomenon. On the other hand, the results have important practical significance for preventing downhole accidents and improving drilling efficiency for complex well structure.

Keywords: drill string; stick-slip; axial; torsional

References

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