钻井液对钻柱振动特性影响分析  

Effect of Drilling Fluid on Vibrating Properties of the Drill String

作　　者：徐鸿志[1] 路政 卢晓峰 胡毅 周军明 

机构地区：[1]中国石油集团工程技术研究院 [2]渤海钻探工程技术研究院 [3]渤海钻探国际工程分公司

出　　处：《钻井液与完井液》2010年第4期41-43,共3页Drilling Fluid & Completion Fluid

摘　　要：针对空气钻井存在钻具使用寿命短、钻具失效严重、钻具成本高的问题,应用ANSYS软件,建立了钻柱振动有限元模型,并对液体动力效应和浮力效应的淹没管道单元进行了数值模拟计算。以普光102-2井为例的计算结果表明,钻井液对钻柱振动特性有较大影响。考虑钻井液影响后,钻柱纵向和横向振动各阶固有频率均有较大程度降低,且随钻井液密度增大固有频率缓慢降低;但钻井液对扭转振动特性影响较小。谐响应表明,钻井液动力效应使钻柱低频共振响应加强,高频共振响应减弱,说明钻井液阻尼作用对钻柱的动力安全性有一定的积极意义,这正好与普光102-2井的典型钻柱失效事故的分析结果相吻合。In view of air drilling, finite element model was built and numerical simulation on properties of the drill string was done in this paper. The results showed that drilling fluid has a significant effect on the vibrating properties of the drill string. The natural frequency value of axial vibration and lateral vibration greatly decreased after considering the effect of drilling fluid, and the value of natural frequency decreased when the density of drilling fluid increased.However, drilling fluid had a little effect on the torsional vibration properties of drilling string. The results of harmonic response analysis showed that the low frequency resonance became stronger and the high frequency resonance became weaker because of the hydrodynamic effects of drilling fluid. Besides, the damping of drilling mud had a positive effect on the safety of drill string.

关 键 词：空气钻井 钻柱振动模型 钻井液 固有频率 谐响应 

分 类 号：TE242.7[石油与天然气工程—油气井工程]