钻井系统黏滑效应的非线性稳定性研究

Study on Non-linear Stability of Stick-slip Effect of the Drilling System

为了得到一种更准确的预测钻井系统黏滑振动稳定性的方法,建立了钻井系统的无限维模型。采用模态分析方法得到了钻柱各模态的稳定边界,分析了边界内外的振动特性。结果表明,钻柱稳定性取决于钻柱的切削参数以及接触应力。

To obtain a more accurate method for predicting the stick-slip vibration stability of drilling system,an infinite dimensional model of drilling system was established.The stable boundary of each mode of drill string was obtained by modal analysis method,and the vibration characteristics inside and outside the boundary were analyzed.The results show that the stability of drill string depends on the cutting parameters and contact stress of the drill string.