基于钻头破岩钻进的下部钻具横向振动特性研究

祝效华 胡志强.

振动与冲击 ›› 2014, Vol. 33 ›› Issue (17) : 90-93.

PDF(1417 KB)
PDF(1417 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (17) : 90-93.
论文

基于钻头破岩钻进的下部钻具横向振动特性研究

  • 祝效华1 胡志强1.2
作者信息 +

Analysis of lateral vibration characteristics of bottom hole assemblybased on the interaction between bit and rock

  • Zhu Xiaohua1, Hu Zhiqiang1.2
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摘要

针对横向振动引起下部钻具失效的问题,基于钻头破岩钻进,并考虑钻具纵横扭耦合以及钻具与井壁随机接触,建立了系统非线性动力学模型,研究了下部钻具横向振动特性。结果表明:在常用的牙轮钻头单扶下部钻具组合钻进过程中,钻头横振表现出较强的随机性,根据贝克休斯公司对钻具振动的量化标准,其强度属于剧烈分区;钻铤横振强度随其与钻头距离增大而近似呈指数递减,并在距钻头约50m以后趋于稳定;钻铤上接的钻杆与近钻头钻铤的横振强度相当;下部钻具横振强度随钻压、转速增大而增大。本文考虑了牙轮钻头破岩钻进与下部钻柱的交互影响,对进一步揭示下部钻具的横振特性以及参数优选具有积极意义。

Abstract

The lateral vibration of bottom hole assembly (BHA) has a great effect on its fatigue life, and causes well trajectory control problem. A nonlinear dynamic model of BHA was set up under the considering of the interaction between bit and rock, the dynamic coupling between axial, lateral and torsional vibrations, and the contact between BHA and borehole well. The lateral vibration characteristics of BHA were studied by utilizing the finite element method. The results showed that the lateral vibration of bit was obvious and stochastic during drilling., and its vibration strength belongs to the unsafe level account to the standard provided by the Baker Hughes INTEQ Co. As drill collar's distance from bit increased, the lateral vibration strength almost decreased exponentially, and tended to be constant after its distance achieved 50m. The vibration strength of drill pipe was similar with that of the drill collar near bit. The lateral vibration of BHA would get worse when either RPM (revolution per minute) or WOB (weight on bit) increased. This paper provides a new method for the study of the dynamic characteristics of BHA, and also, offers a guidance for the choices of drilling parameters and bottom hole assembly.


关键词

下部钻具 / 破岩 / 随机接触 / 横向振动 / 加速度

Key words

bottom hole assembly (BHA) / rock breaking / contact / lateral vibration / accelerate

引用本文

导出引用
祝效华 胡志强.. 基于钻头破岩钻进的下部钻具横向振动特性研究[J]. 振动与冲击, 2014, 33(17): 90-93
Zhu Xiaohua;Hu Zhiqiang.. Analysis of lateral vibration characteristics of bottom hole assemblybased on the interaction between bit and rock[J]. Journal of Vibration and Shock, 2014, 33(17): 90-93

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