斜直井眼中钻柱横向动态运动非线性模型研究

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Abstract

Effective measures can’t be taken to avoid drill-strings’ abnormal wear and drill-pipe worn through caused by drill rod’s eccentric wear due to the lack of knowing clearly motion laws of drill-string in a deviated well. A 4-DOF nonlinear dynamic model for irregular motion of a drill-string in a deviated well was established here based on Lagrange equations considering drill-pipe’s stick-slip motion, its lateral and torsional deformations and well fluid damping effects. Under different inclinations (α), numerical studies showed that when α=90°, the drill-string creeps along the well wall within a 30° sector region about the drill-pipe’s spinning direction; with decrease in the inclination, due to friction damping torque’s concentration and release, accompanying with random stick-slip and tumbling, the drill-pipe’s local friction and tumbling motion grows and gradually extends to a whirl motion with random impacts in the whole wellbore; the built 4-DOF nonlinear dynamic model can be used to better understand the downhole working conditions of directional drilling, and provide a theoretical guide for decreasing drill-strings’ abnormal wear and preventing drill-pipe worn through.

Key words： drill-string mechanics nonlinear dynamic model stick-slip and tumble deviated well

Received: 28 July 2016 Published: 15 December 2017

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	Articles by authors
	LIU Yongsheng 1
	2 GAO Deli 1
	2 WANG Zhenquan 1 LIU Kui 1

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LIU Yongsheng 1,2 GAO Deli 1,2 WANG Zhenquan 1 LIU Kui 1. Nonlinear dynamic model of drill-string transverse motion in a deviated well[J]. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(24): 1-6.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2017/V36/I24/1

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