牙轮钻头纵向横向扭转振动动力学仿真研究

随着石油资源钻探难度的不断加大，有效地预测和控制井下钻头的运动规律，改善钻柱动力学性能，以提高钻头和钻柱的强度，实现对井眼轨迹的精确控制是目前钻井工业中亟待解决的关键技术难题。本文根据牙轮钻头的实际振动状态，分析了钻头产生各种振动的机理，讨论了钻头-岩石互作用力学模型，用能量法建立了考虑牙轮钻头纵向、横向和扭转振动耦合非线性系统动力学分析模型，编制了系统动力学仿真程序，并结合实例对牙轮钻头系统进行了动态仿真。

Dynamic Simulation of Roller Cone Bit System with Lengthways,Tranverse and Torsional Vibrations

In the process of oil drilling,drilling string and rock bit are main drilling tools whose failure would cause serious accidents.To solve this problem,the vibration of string should be analysed.In reference to the mechanical model of the roller cone bit and rock,the longitudinal vibration model,torsional vibration model and lateral vibration model are founded and the simulation is made under the candition of actual parameters of the roller cone bit.The dynamic model reveals the dynamic behavior of string and is instructive to design new rock bit and to analyse drilling process.Therefore,it is of both theoretical and practical value.