水平井直井段钻柱固液耦合横向振动分析  

Analysis of Transverse Vibration of the Drill String in Vertical Section of Horizontal Well

作　　者：曹宇[1] 周思柱[1] 孟繁强[2] 华剑[1] 张凯[1] 吴话怡 

机构地区：[1]长江大学机械工程学院机械结构强度与振动研究所 [2]河北省廊坊市百斯图工具制造有限公司

出　　处：《石油机械》2017年第3期48-51,共4页China Petroleum Machinery

基　　金：中国石油科技创新基金项目"深水平井钻进过程中钻柱及起升系统振动特性研究"(2014D-5006-0310);长江大学博士启动金资助项目"超深井石油钻机起升系统振动机理研究"(801140010125)

摘　　要：针对钻柱共振导致的钻具疲劳失效问题,以西南地区某水平井直井段钻柱为研究对象,采用流体数值计算软件,建立了钻柱内、外壁压力关于井深的函数。基于动力学理论,考虑钻柱内、外不同密度钻井液与钻柱耦合作用,通过有限元软件进行了水平井直井段钻柱横向振动分析,研究了钻铤长度和减震器安装位置对钻柱横向振动固有频率的影响规律,指出钻柱长度一定时,钻铤越长,钻柱横向振动的固有频率越大;安装减震器时,减震器安装位置与钻头距离增加,钻柱横向振动的各阶固有频率增大。研究结果可为水平井施工提供一定的指导。For the drill string fatigue failure caused by drill string resonance, taking the drill string in the ver-tical section of a horizontal well in the southwest of China as study object, the inner and outer pressure of the drill string as the function of well depth has been established by using the fluid numerical software. Based on the dynam-ic theory, considering the coupling effect of different density drilling fluid inside and outside the drill string, the transverse vibration of drill string in the vertical section of horizontal well has been analyzed by finite element soft-ware. The influences of drill collar length and shock absorber installation position on the natural frequency of drill string transverse vibration have been studied. The results show that, with the given drill string length, the longer the drill collar is, the larger the natural frequency of the transverse vibration of the drill string is. While installing shock absorber, each order of natural frequency of transverse vibration of the drill string increases with the distance of the shock absorber installation from the drill bit. The study results could provide guidance for horizontal well operation.

关 键 词：钻柱 水平井 直井段 钻井液 横向振动 固有频率 

分 类 号：TE921[石油与天然气工程—石油机械设备]