Power-V诱导的钻柱黏滑振动特征分析

Analysis of stick-slip vibration characteristics of drill-string induced by Power-V

黏滑是石油钻井过程中影响钻井效率和井下钻柱安全的一种振动形式.垂直钻井系统Power-V在提供有效控斜力的同时,还会诱导钻柱黏滑振动.通过研究垂直钻井系统Power-V与井壁的接触作用及钻头与地层的相互作用模型,基于钻柱动力学有限元方法,深入分析Power-V的作用机理,研究其对扭转振动的影响,指出Power-V和井壁间的相互作用会导致钻柱与井壁的摩阻显著增加,进而引起摩阻扭矩的增大,诱导井下黏滑振动.实测振动数据证实,Power-V与井壁间的相互作用是引起钻柱黏滑振动的关键因素.这对于揭示黏滑振动的成因和更好地发挥Power-V的作用具有重要意义.

Stick-slip motion is a vibration that affects drilling efficiency and downhole drill-string safety.The Power-V can provide an effective deviation control force and also induce stick-slip vibration of drill-string in vertical drilling systems.This study investigates the stick-slip vibration characteristics of a drill-string induced by Power-V.The interaction between Power-V and the wellbore,and the contact model between the bit and formation were studied.The action mechanism of Power-V was extensively analyzed,and its influence on torsional vibration was investigated using the finite element method for drill-string dynamics.The results show that the interaction between Power-V and the borehole wall significantly increases the friction between the drill-string and borehole wall,resulting in an increase in the friction torque and inducing downhole stick-slip vibration.The measured vibration data confirmed the interaction between Power-V and the borehole as the key factor causing the stick-slip vibration of the drill-string.This study is significant in revealing the causes of stick-slip vibration and maximizing the use of Power-V.