An Improved Model to Characterize Drill-String Vibrations in Rotary Drilling Applications

作     者：Yong Wang Hongjian Ni Ruihe Wang Shubin Liu 

作者机构：School of Petroleum EngineeringChina University of Petroleum(East China)Qingdao266580China 

出 版 物：《Fluid Dynamics & Materials Processing》 (流体力学与材料加工（英文）)

年 卷 期：2022年第18卷第5期

页      面：1263-1273页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0814[工学-土木工程] 

基　　金：This work was sponsored by the Major Science and Technology Project of the CNPC under Grant ZD2019-183-005. 

主　　题：Stick-slip vibration bit bouncing torsion pendulum rock brittleness cutting force 

摘      要：A specific model is elaborated for stick-slip and bit-bounce vibrations,which are dangerous dynamic phenomena typically encountered in the context of rotary drilling applications.Such a model takes into account two coupled degrees of freedom of drill-string vibrations.Moreover,it assumes a state-dependent time delay and a viscous damping for both the axial and torsional vibrations and relies on a sawtooth function to account for the cutting force fluctuation.In the frame of this theoretical approach,the influence of rock brittleness on the stability of the drill string is calculated via direct integration of the model equations.The results show that the rock brittleness has a great influence on the rotational speed and bit depth.