Study of the influences of rotary table speed on stick-slip vibration of the drilling system

Petroleum

卷:1

Jian Tang¹  Daping Xu²  Changshuai Shi³  Xiaohua Zhu³  Liping Tang³ 

[1] Department of Gas, Tarim Oilfield Company, Korla, Xinjiang 841000, China;

[2] School of Mechanical Engineering, Sichuan University of Science and Engineering, Zigong, Sichuan 643000, China;

[3] School of Mechatronic Engineering, Southwest Petroleum University, Chengdu 610500, China;

关键词: Stick-slip vibration;    Rotary table speed;    Drillstring;    Drill bit;    Frictional torque;    Limit cycle;   

DOI  :  10.1016/j.petlm.2015.10.004

来源: DOAJ

【 摘 要 】

Stick-slip vibration presents one of the major causes of drilling problems, such as premature tool failures, low drilling efficiency and poor wellbore quality. The objective of this work is to investigate the influences of rotary table speed (RTS) on stick-slip phenomenon of the drilling system. In this study, the drilling system is treated as a lumped torsional pendulum model of which the bit/rock interaction is regarded as Coulomb friction. By analyzing cases with different RTS, two types of vibrations on the bit are found: stick-slip vibration and uniform motion. With an increase in the RTS, the stick-slip vibration on the drill bit disappears once the RTS arrives at its critical value. For the cases that stick-slip vibrations occur, the phase trajectories converge toward a limit cycle. For the cases that stick-slip vibration does not appear, the drill bit tends to stabilize at a uniform motion and the phase trajectories correspond to contracting spirals observed in the phase plane.

【 授权许可】

Unknown