垂直井中受压段旋转钻柱的分岔研究  

A STUDY OF BIFURCATION OF THE COMPRESSIVE-ROTATING DRILLSTRING IN VERTICAL WELL SECTION

作　　者：范慕辉[1] 焦永树[1] 王磊[1] 

机构地区：[1]河北工业大学机械工程学院,天津300130

出　　处：《工程力学》2003年第6期127-129,126,共4页Engineering Mechanics

基　　金：河北省教委博士基金项目

摘　　要：主要目的是研究钻柱的转动效应对铅垂井段钻柱屈曲行为的影响。通过考虑垂直井中受压段钻柱在旋转时引起的惯性力,建立了在分布浮重作用下旋转钻柱的分岔微分方程。通过对方程的数值求解,得到了旋转钻柱发生屈曲时的前四阶分岔值曲线及相应的屈曲构形。计算结果表明,随着钻柱转速的提高,发生各阶屈曲的临界钻压将明显降低。通过对工程实例的分析得知,转动效应对受压段钻柱的屈曲行为有不可忽视的影响。The present work aims to investigate the effect of the rotating speed on the buckling behavior of the drillstring in oil drilling engineering. Taking into account the rotating inertial force of the drillstring, a bifurcating differential equation is established for the rotating slender drillstring in compression in vertical well section subjected to distributed buoyant weight. The equation is solved numerically. The first four-order bifurcating value curves and the corresponding buckled configurations are shown graphically. The present work shows that the higher the rotating speed of the drillstring is, the lower the buckling weight-on-bit of the drillstring. As an example, a practical drilling case is analyzed, indicating that the rotating effect has significant influence on the buckling behavior of the drillstring.

关 键 词：钻井工程 钻柱屈曲 分岔 旋转钻柱 临界钻压 数值方法 

分 类 号：TE21[石油与天然气工程—油气井工程]